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Nano composite water absorbing material, and preparation method

A water-absorbing material and nano-composite technology, which is applied in the field of nano-composite water-absorbing materials and preparation, can solve the problem that it is difficult to completely eliminate the interfacial tension between filler and polymer matrix, the mineral powder cannot reach the molecular dispersion level, and the enhancement effect and heat resistance are affected. problem, to achieve the effect of easy implementation of post-processing technology, low production cost and less equipment

Inactive Publication Date: 2006-04-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical structure and physical state of the interface between the filler and the polymer are very different, and the existing interface improvement technology is difficult to completely eliminate the interfacial tension between the filler and the polymer matrix to achieve ideal uniform dispersion and interfacial bonding. The interface design of the molecular size is very different. The mineral powder cannot reach the level of molecular dispersion, but only belongs to the microscopic composite water-absorbing material, which affects the enhancement effect and the improvement of heat resistance.

Method used

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  • Nano composite water absorbing material, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1～4

[0020] Add 15 grams of acrylamide and 5 grams of acrylic acid to a beaker filled with deionized water. After the acrylamide is dissolved, slowly add sodium carbonate to neutralize the acrylic acid in the solution, adjust the pH to 7, and then add 5 grams of starch in turn. and 0.00015 grams of N, N-methylenebisacrylamide, heated up to 75 ° C, stirred evenly, so that the starch gelatinized in the monomer solution, and when the solution changed from turbid milky white to colorless, the total mass was maintained at 100 In the case of gram, add 2 grams, 5 grams, 8 grams and 10 grams of modified montmorillonite respectively, continue to stir, take it out from the three-necked beaker and put it in the beaker after about 25 minutes, cool down to 60 ° C, add 0.25 grams of over Ammonium sulfate initiator, after gelation for a certain period of time, the gel block product can be obtained after standing at room temperature for 1 hour. Finally, the composite material gel particles are pre...

example 3

[0022] The water absorption of the sample in Example 3 in solutions of different concentrations of NaCl is shown in Table 2; the water absorption in several salt solutions with a concentration of 0.5% is shown in Table 3.

[0023] NaCl content, %

[0024] Salt (concentration 0.5%)

[0025] The data in Table 2 and Table 3 show that as the concentration of the external salt solution increases and the valence of salt ions increases, the water absorption rate of the composite water-absorbing agent decreases significantly. The data in Table 3 also shows that the nano-composite water-absorbing ingredients have particularly good water-absorbing properties for ammonium salts, potassium salts, and artificial urine, which shows that they have a strong ability to retain water and fertilizer.

example 5～8

[0027] Add 17 grams of acrylamide and 3 grams of acrylic acid into a beaker filled with deionized water. After the acrylamide is dissolved, slowly add sodium carbonate to neutralize the acrylic acid in the solution, adjust the pH to 7, and then add 6 grams of starch and 0.00015 grams of N, N-methylenebisacrylamide, heated up to 75 ° C, stirred evenly, so that the starch is gelatinized in the monomer solution, and when the solution turns from turbid milky white to colorless, keep the total mass at 100 grams 2 grams, 5 grams, 8 grams and 10 grams of modified montmorillonite were added respectively, and the stirring was continued. After about 25 minutes, it was taken out from the three-necked beaker and put into a beaker. The temperature was lowered to 60°C, and 0.25 grams of over Ammonium sulfate initiator, after gelation for a certain period of time, the gel block product can be obtained after standing at room temperature for 1 hour. Finally, the composite material gel particle...

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Abstract

A nano-class composite hydroscopic material is prepared through proportionally adding acrylamide and acrylic acid to deionized water, dissolving, adding sodium carbonate to neutralize the acrylic acid in solution, sequentially adding cross-linking agent and starch, heating while stirring for gelatinizing starch, adding modified montmorillonite, stirring, cooling to 60 deg.C, adding trigger, gelatinizing and laying aside for 1 hr to obtain gel block. Its advantages are high hydroscopicity and strength after water is absorbed and high resistance to high temp and salt.

Description

technical field [0001] The invention relates to a nanocomposite water-absorbing material and a preparation method using starch grafted with acrylic acid and acrylamide / montmorillonite. Background technique [0002] Starch superabsorbent resin is a new type of functional polymer material that has developed rapidly in recent years, and has become the focus of research in the field of water-absorbent resin. In the past 20 years, it has been widely used in various fields such as medical and health care, agriculture, forestry, horticulture, petrochemical industry, daily chemical industry, and construction. At present, most of the various starch superabsorbent resins developed at home and abroad have high water absorption rate for deionized water or distilled water, but the salt water absorption rate drops to 1 / 10-1 / 50, poor temperature resistance, and weak strength after water absorption. high, which limits its scope of application. The clay / organic resin blended water-absorbin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/02C08F251/00C08F2/44C08K9/00C08K3/34
Inventor 周明赵金州蒲万芬
Owner SOUTHWEST PETROLEUM UNIV
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