Method for preparing polyacrylic acid water-retaining agent
A technology of polyacrylic acid and water-retaining agent, applied in chemical instruments and methods, applications, organic fertilizers and other directions, can solve the problems of unsuitable large-scale production, complex preparation process, unfavorable popularization and application, etc. Good water absorption effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0020] The invention provides a kind of preparation method of polyacrylic acid water retention agent, comprises the following steps:
[0021] uniformly mixing acrylic acid, kaolin, urea, ammonium persulfate, sodium bisulfite, N,N-methylenebisacrylamide, starch and water to obtain a mixed solution;
[0022] The mixed solution is polymerized under anaerobic conditions to obtain a polyacrylic acid water retaining agent.
[0023] The invention uses acrylic acid, kaolin, urea and starch as raw materials, undergoes radical polymerization reaction in aqueous solution under the action of an initiator and a crosslinking agent, and obtains a polyacrylic acid water-retaining agent. The process is simple, pollution-free, and suitable for industrial production.
[0024] The present invention uses acrylic acid as a raw material to prepare the polyacrylic acid water-retaining agent. In the present invention, sodium hydroxide solution with a mass concentration of 30% is preferably used to adj...
Embodiment 1
[0054] Put 18 grams of acrylic acid in the reactor, neutralize it with a 30% aqueous sodium hydroxide solution to a pH of 5.5, add 8 grams of kaolin, mix well, add 5 grams of urea, continue to mix well, and then add 0.2 grams of supernatant Ammonium sulfate, 0.1 g of sodium bisulfite, 0.2 g of N, N-methylenebisacrylamide, mix well, then add 8 g of cornstarch and metered deionized water to make the total weight of the aqueous solution 100 g, mix well After passing nitrogen for 30 minutes, polymerize at a temperature of 55°C for 3 hours to obtain a gel-like polymer, cut the gel-like polymer into pieces, dry, and pulverize to obtain a polyacrylic acid water-retaining agent.
[0055] According to the method described above, the polyacrylic acid water-retaining agent was tested for water absorption, and the results showed that its water absorption rate was 240 times, and the absorption rate of physiological saline was 30 times.
Embodiment 2
[0057] Put 22 grams of acrylic acid in the reactor, neutralize it with a 30% aqueous solution of sodium hydroxide to a pH value of 6.5, add 15 grams of kaolin, mix well, add 8 grams of urea, continue mixing evenly, and then add persulfuric acid 0.3 grams of ammonium, 0.3 grams of sodium bisulfite, 0.4 grams of N, N-methylenebisacrylamide, mix well, then add 10 grams of cornstarch and metered deionized water, so that the total weight of the aqueous solution is 100 grams, mix After homogeneity, pass nitrogen gas for 30 minutes, polymerize at 70°C for 5 hours to obtain a gel-like polymer, cut the gel-like polymer into pieces, dry, and pulverize to obtain a polyacrylic acid water-retaining agent.
[0058] According to the method described above, the polyacrylic acid water-retaining agent was tested for water absorption, and the results showed that its water absorption rate was 460 times, and the absorption rate of physiological saline was 60 times.
PUM
| Property | Measurement | Unit |
|---|---|---|
| water absorption | aaaaa | aaaaa |
| water absorption | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More