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Sodium polyacrylate solution, chemical formula (C3H3NaO2) n, is a new functional polymer material and important chemical product. The solid product is white or light yellow block or powder, and the liquid product is colorless or light yellow viscous liquid. It is insoluble in ethanol, acetone and other organic solvents. It will not decompose when heated to 300 ℃. Long lasting viscosity changes very little and is not easy to corrupt. Easily affected by acid and metal ions, the viscosity decreases. Encounter with divalent and above metal ions (such as aluminum, lead, iron, calcium, magnesium, zinc) to form its insoluble salt, causing molecular cross-linking and gel precipitation. It is prepared from acrylic acid and its esters through aqueous solution polymerization. Odorless, soluble in sodium hydroxide aqueous solution, precipitated in calcium hydroxide, magnesium hydroxide and other aqueous solutions. It is often used as water treatment agent, brine refining and latex thickening, and also as food thickening and emulsification.
Sodium Polyacrylate (ASAP) is a polymer compound that possesses both hydrophilic and hydrophobic groups, with a relative molecular weight ranging from several hundred to several million. Its unique molecular structure endows it with excellent water absorption, dispersibility, thickening, and film-forming properties, making it a key material for cross disciplinary applications.
The use of sodium polyacrylate is closely related to its molecular weight, and different molecular weight ranges correspond to vastly different functional characteristics:
1.1 Low molecular weight (1000-5000)
Dispersant: In industrial water treatment, low molecular weight sodium polyacrylate forms a soluble chain structure by chelating calcium and magnesium ions, effectively preventing equipment scaling. For example, adding it to the cooling tower of a power plant can extend the service life of the equipment by three times and prevent the formation of new scale in the kettle for three months.
Washing aid: As an environmentally friendly alternative to sodium tripolyphosphate, its ability to disperse dirt particles can enhance the cleaning power of anionic surfactants, while also possessing resistance to hard water and high temperatures, with a biodegradation rate of over 90%.
Metal recycling: In the treatment of electroplating wastewater, resource recycling is achieved by adsorbing metal ions.
1.2 Medium molecular weight (10 ⁴ -10 ⁶)
Thickener: In the food industry, a 0.1% addition can make low-fat yogurt taste comparable to full fat products, and increase the density of konjac jelly by 40%. In the cosmetics field, its ability to regulate the viscosity of lotion makes face cream texture easier to apply, and can form a moisturizing film to lock water.
Flocculating agent: In sewage treatment, it forms flocculent sediment by adsorbing suspended particles, achieving rapid purification of sewage. For example, in the production of alumina, the separation efficiency of red mud can be increased by 60%.
Drug carrier: As a sustained-release formulation substrate, it controls the drug release rate, ensuring that the antihypertensive effect lasts for 24 hours and reducing the number of times patients take medication.
1.3 High molecular weight (10 ⁶ -10 ⁷)
Highly absorbent resin: capable of absorbing up to 500 times its own weight of water, widely used in hygiene products such as baby diapers and sanitary napkins. Experiments in cotton fields in Xinjiang have shown that using it as a soil water retaining agent can reduce irrigation by 30% while increasing yield by 20%.
Artificial snow making: Fake snow formed by cross-linking sodium polyacrylate is used for ski resorts and movie scene construction, and its water absorption and expansion characteristics can simulate real snow quality.
Medical dressing: As an anti infective bandage, it can absorb wound exudate and prevent suppuration, while promoting epidermal cell regeneration.
Cross industry applications supported by core performance
The four core properties of sodium polyacrylate - water absorption, dispersibility, thickening, and film-forming - make it an indispensable foundational material in various fields
Water absorption: from hygiene products to agricultural water-saving
Sanitary products: Baby diapers can absorb up to 500 times their own weight and maintain 85% water absorption under pressure, far exceeding traditional wood pulp.
Agricultural water retention: After application in sandy soil, a water slow-release layer can be formed, which increases the survival rate of corn seedlings from 60% to 92%.
Medical field: as an artificial tear component, relieve symptoms of dry eye syndrome; Used during surgery to absorb body fluids and reduce the risk of infection.
Dispersion: from industrial recycled water to oil extraction
Water treatment: In the air conditioning circulation system, it can increase heat exchange efficiency by 25% and reduce energy consumption by 18%.
Oil extraction: As an oil displacement agent, the use of viscoelastic particle technology has increased the daily production of old oil fields by 87.5% and extended equipment maintenance cycles by three times.
Ceramic manufacturing: As a water reducing agent, it increases the drying strength of the body by 40% and reduces firing cracks.
Thickening: from food processing to coating industry
Food industry: In bread making, dough extensibility can be increased by 30%, and the volume of baked bread can be increased by 15%. In jam production, to prevent layering and sedimentation, the shelf life is extended to 12 months.
Coating industry: Improve the anti peeling performance of wall coatings by 50%, and maintain stable viscosity within the temperature range of -10 ℃ to 60 ℃.
In the field of daily chemical products, adding it to shampoo can increase hair softness by 40% and make it easy to rinse.
Film forming properties: from cosmetics to pharmaceutical packaging
Cosmetics: As the base material of facial mask, it can carry 10 times of its own weight of essence and prevent dripping. Form a breathable film in sunscreen to increase SPF value by 20%.
Pharmaceutical packaging: As a sustained-release drug substrate, it controls the drug release rate to ensure the efficacy of nitroglycerin patches lasts for 12 hours.
Food preservation: Forming antibacterial film in meat packaging extends the shelf life by 3 days and maintains over 90% freshness and tenderness of the meat.
The application of sodium polyacrylate has penetrated into various fields of the national economy and demonstrated potential in emerging technologies
Food Industry: Balancing Health and Taste
Low calorie food: Adding 0.1% sodium polyacrylate to konjac products can reduce calories by 50% while maintaining a dense texture.
Improvement of noodle products: After adding it to noodles, the cooking time is extended to 15 minutes and the breakage rate is reduced to less than 1%.
Stable dairy products: prevent whey precipitation in yogurt, make the texture more uniform, and increase the survival rate of probiotics by 30%.
Medical field: innovative applications of biocompatibility
Wound care: As a hydrogel dressing, it can absorb wound exudate and release silver ions, reducing the infection rate to below 2%.
Drug delivery: In insulin sustained-release tablets, the drug release rate is controlled to reduce blood glucose fluctuations by 40%.
Organizational engineering: As a 3D bioprinting scaffold material, it supports cell adhesion and proliferation, providing possibilities for artificial organ manufacturing.
Environmental protection field: key materials for green technology
Wastewater treatment: In printing and dyeing wastewater, the COD removal rate can be increased to 95%, and the chromaticity can be reduced to less than 50 times.
Soil remediation: In heavy metal contaminated soil, lead and cadmium ions are fixed by chelation, reducing plant absorption by 80%.
Air purification: As an adsorbent, it can remove 90% of formaldehyde from the air and has a regeneration efficiency of over 85%.
Emerging Technologies: Explorers in Frontier Fields
Flexible electronics: As an electrolyte material, it increases the energy density of supercapacitors to 10Wh/kg and has a charge discharge cycle life of over 100000 times.
Artificial Intelligence: As a tactile sensor in robot skin, it can detect tiny pressure of 0.1N with a response time of less than 10ms.
Aerospace: As a phase change material, it can achieve a temperature fluctuation range of less than ± 2 ℃ and a weight reduction of 30% in satellite thermal control systems.
The maximum amount of sodium polyacrylate added is 0.2% according to the provisions of GB2760-19962000 supplementary varieties. The amount of sodium polyacrylate is affected by different food types, raw material quality, formulas and production processes. Therefore, it is necessary to determine the optimal amount through experiments. In particular, pay attention to the misunderstanding that the more grams you take, the better the effect. The reference amount is generally 0.02%~0.1%.
Compared with other thickeners, sodium polyacrylate has the most significant advantage of high thickening efficiency. Its viscosity is about 15-20 times that of sodium carboxymethyl cellulose (CMC) and sodium alginate. Its disadvantage is that it has poor salt resistance and hard water resistance. Its solubility and viscosity will decrease in salt water and hard water. Therefore, it is best to use soft water to dissolve it in application and separate it from salt. If hard water can only be used due to limited conditions, hard water resistant thickener can be used.
Preparation of sodium polyacrylate solution:
1. Add deionized water and 34kg chain transfer agent isopropanol into the reactor in turn and heat them to 80~82 ℃. Add 14kg ammonium persulfate and 170kg monomer acrylic acid aqueous solution (deionized water) by dropping. After dripping, the reaction lasts for 3h. Cool to 40 ℃, add 30% NaOH aqueous solution, neutralize to pH 8.0~9.0, and evaporate isopropanol and water to obtain liquid product. Spray drying is used to obtain the solid product acrylic acid or acrylate, which reacts with sodium hydroxide to obtain sodium acrylate monomer. The by-product alcohols are removed. After concentration and pH adjustment, the monomer is polymerized with ammonium persulfate as catalyst to obtain sodium acrylate monomer, which is polymerized with acrylic acid and sodium hydroxide, and then polymerized into sodium polyacrylate under the catalysis of ammonium persulfate. Add sodium polyacrylate with relative molecular weight of 1000~3000 into the reactor, Prepare 30% aqueous solution.
2. Polymerization method: add a certain amount of deionized water into a 500mL four necked flask equipped with agitator, reflux condenser, thermometer and drop funnel, then add the chain transfer agent sodium bisulfite (the amount accounts for 4.5% of the system mass), stir and dissolve, heat up to 65 ℃, and start dropping the monomer acrylic acid and initiator ammonium persulfate aqueous solution. The mass fraction of monomer acrylic acid accounts for 30% of the system, and the mass fraction of ammonium persulfate accounts for 0.06% of the system. The dropping time is 3h, and the temperature is kept for 3h after dropping. Neutralize with 30% sodium hydroxide aqueous solution to pH value of 7~7.5 to obtain colorless, viscous, low molecular weight sodium polyacrylate solution.
3. lotion polymerization: the monomer solution is neutralized by acrylic acid through sodium hydroxide solution, and then a small amount of acrylamide is added. In a 250mL reaction flask, add monomer solution and sodium dodecyl sulfonate, stir them and mix them evenly. At the same time, apply nitrogen and deoxygenate for 20min, and add reducing agent, emulsifier, solvent and oxidant. The system was heated to 45 ℃, and polymerization was completed after 4 hours. When the temperature rises to a certain amount of water, stop the reaction. Finally, the reaction solution is filtered and dried to obtain powdered product (PAA Na).
It is widely used. Using its viscosity and thickening property, the aqueous solution of this product is widely used as a water-based adhesive, viscosity and thickening agent for lotion, plastic and rubber. In fabric finishing, it is used as a bonding agent and tackifier for flocking, waterproof treatment, printing and dyeing, one side sizing of carpet and non-woven fabrics.
It is used as adhesive and thickener in cosmetics and medicine. Its cohesiveness can be used as scale inhibitor for water treatment in boiler and other water treatment, which can inhibit the formation of scale such as calcium carbonate and calcium sulfate.
It is also used as a clarification accelerator for sugar liquor, beverages and tap water sources; Precipitation accelerant for salt water refining in electrolytic soda industry;
Protein recovery agent from food industry wastewater, etc. Its dispersibility can be used as paper making agent, pigment dispersant, pesticide dispersant, etc.
It can be used as adhesive for paper making, adhesive solvent for casting, fluorescent film forming agent for fluorescent lamp and mercury lamp.
When it is used as a food additive, it can interact with protein as an electrolyte to change the structure of protein, enhance the viscoelasticity of food, and improve the adhesion of protein in flour;
It is used for bread, cake, cans, ice cream, sauce products, fruit juice, etc. It also has the effects of thickening, dispersion, stability, water retention, freshness preservation, etc.
It can also be used as the raw material of super absorbent resin and as a soil conditioner.
Sodium polyacrylate solution is a transformative material with far-reaching applications across industries. Its ability to absorb, retain, and release water has revolutionized personal care, agriculture, and environmental management. While challenges related to biodegradability and microplastic pollution persist, ongoing research into sustainable alternatives and smart materials offers promising solutions. As industries prioritize water conservation and circularity, sodium polyacrylate will continue to play a vital role in shaping a resource-efficient future. By balancing innovation with environmental stewardship, this remarkable polymer can drive progress toward a more sustainable world.
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