Disclosure of Invention
The invention provides a sodium polyacrylate high-absorptivity resin with high blood absorption performance and a preparation method thereof, which solve the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high-absorptivity resin of sodium polyacrylate with high blood-sucking power is prepared from high-absorptivity sodium polyacrylate and N-amino acid-base acrylic amide.
The N-amino acid-based acrylic acid amide accounts for 0.5-5%, preferably 0.7-4.9% of the weight of the sodium polyacrylate high-absorptivity resin.
The N-amino acid based acrylic amide is amide obtained by reacting carboxyl of acrylic acid with alpha amino of natural amino acid, and has the following structure:
Acrylamide with proline as structural formula 1;
the structural formula 2 is acrylamide of 19 other natural amino acids.
In the structural formula 2, R group is glycine, alanine, phenylalanine, cysteine, serine, valine, leucine, isoleucine, glutamine, methionine, histidine, arginine, lysine, tryptophan, tyrosine, threonine, glutamic acid, asparagine and aspartic acid.
The R groups in formula 2 and the natural amino acids represented by them are as follows:
wherein the R groups and the natural amino acids represented by them are as follows in Table 1:
table 1.
Preferably, the sodium polyacrylate high-absorptivity resin with high blood absorption performance comprises the following raw materials in parts by weight:
300-400 parts of acrylic acid, 10-50 parts of N-amino acid acrylic amide, 5-10 parts of a cross-linking agent, 500-700 parts of deionized water, 180-240 parts of sodium hydroxide and 26-39 parts of an initiator.
The cross-linking agent is one or a mixture of diacetone acrylamide and polyethylene glycol diacrylate; the initiator is prepared from 4-6 parts of oxidant, 2-3 parts of reducing agent and 20-30 parts of deionized water.
The oxidant is one of ammonium persulfate, potassium persulfate, hydrogen peroxide and tert-butyl hydroperoxide; the reducing agent is one of sodium bisulfite, sodium sulfite and ascorbic acid.
The neutralization degree of the acrylic acid and the N-amino acid-based acrylic acid amide is 75-85%.
The preparation method of the sodium polyacrylate high-absorptivity resin with high blood absorption performance comprises the following operation steps:
(1) neutralization reaction
Carrying out neutralization reaction on acrylic acid, N-amino acid based acrylic acid amide and a sodium hydroxide solution to obtain a neutralized solution;
(2) polymerisation reaction
Stirring and mixing the neutralized liquid obtained in the step (1) with a cross-linking agent and an initiator to obtain polymer soft colloid;
(3) drying and pulverizing
And (3) drying and crushing the polymer soft colloid in the step (2).
The N-amino acid based acrylic acid amide in the step (1) is amide obtained by reacting carboxyl of acrylic acid with alpha amino of natural amino acid; the cross-linking agent in the step (2) is one or a mixture of diacetone acrylamide and polyethylene glycol diacrylate.
The polymerization reaction condition of the step (2) is polymerization reaction for 10-20min at the temperature of 20-60 ℃.
Preferably, the preparation method of the sodium polyacrylate high-absorptivity resin with high blood absorption performance according to the parts by weight comprises the following operation steps:
(1) and (3) neutralization reaction:
firstly, preparing a sodium hydroxide aqueous solution, adding the rest deionized water and acrylic acid into a neutralization kettle, dissolving N-amino acid base acrylic acid amide in the neutralization kettle, and uniformly stirring; dropwise adding the sodium hydroxide aqueous solution into a neutralization kettle, controlling the reaction temperature to be lower than 50 ℃, stirring for 20-30min after dropwise adding, and naturally cooling;
(2) polymerisation reaction
Adding the obtained neutralized solution into a polymerization reaction kettle, adding the aqueous solution of a cross-linking agent and an initiator under stirring, and carrying out polymerization reaction for 10-20min under stirring at the temperature of 20-60 ℃ to obtain a polymer soft colloid;
(3) drying and pulverizing
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
The invention has the beneficial effects that:
the invention adds functional monomer containing natural amino acid structure into the polymerized monomer, because the important organic matter in blood is protein, the most fundamental problem of solving the blood-sucking property of the blood-sucking high molecular resin is that the polymer resin has strong absorption property to the water and electrolyte in blood and strong adsorption property to the protein in the blood. And proteins are polymers of various natural amino acids. The functional monomer introduced in the invention has a natural amino acid structure, has excellent compatibility with protein, can effectively solve the problem of protein adsorption, and simultaneously has a carboxyl group, has a structure similar to that of acrylic acid, has good compatibility, can perform neutralization reaction like acrylic acid, and has excellent water solubility, so that the introduction of the monomer hardly influences the water absorption and saline water absorption of the final resin.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments.
Example 1
Weighing 180kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; adding 360kg of acrylic acid, 20kg of N-glycine-based acrylamide and 100kg of deionized water into a neutralization kettle, stirring and dissolving uniformly, then dropwise adding the prepared sodium hydroxide aqueous solution, controlling the temperature of the neutralization kettle to be lower than 50 ℃, and after dropwise adding, stirring and reacting for 20-30 minutes.
Weighing 4.4kg of ammonium persulfate, 2.2kg of sodium sulfite and 6kg of diacetone acrylamide, dissolving in 25kg of deionized water, adding into a polymerization kettle, adding the obtained neutralized solution of acrylic acid and functional monomer N-glycine-based acrylamide, and carrying out polymerization reaction for 15 minutes at 20-60 ℃ to obtain the soft colloid of the super absorbent resin.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 1
The same procedure as in example 1 was repeated except that the N-glycinylacrylamide in example 1 was replaced with the same amount of acrylic acid.
Example 2
Weighing 200kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; 380kg of acrylic acid, 18kg of N-glutamyl acrylamide and 80kg of deionized water are added into a neutralization kettle, after uniform stirring and dissolution, the prepared sodium hydroxide aqueous solution is dripped, the temperature of the neutralization kettle is controlled to be lower than 50 ℃, and after dripping is finished, stirring and reacting for 20-30 min.
Weighing 4.8kg of ammonium persulfate, 2.4kg of sodium sulfite and 6.2kg of diacetone acrylamide, dissolving in 28kg of deionized water, adding into a polymerization kettle, adding the obtained neutralization solution of acrylic acid and functional monomer N-glutamic acrylamide, and carrying out polymerization reaction for 15 minutes at 20-60 ℃ to obtain the soft colloid of the super absorbent resin.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 2
The same procedure as in example 2 was repeated except that the N-glutamyl acrylamide in example 2 was changed to the same amount of acrylic acid.
Example 3
Weighing 180kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; adding 350kg of acrylic acid, 15kg of N-lysine acrylamide and 100kg of deionized water into a neutralization kettle, stirring and dissolving uniformly, then dropwise adding the prepared sodium hydroxide aqueous solution, controlling the temperature of the neutralization kettle to be lower than 50 ℃, and after dropwise adding, stirring and reacting for 20-30 min.
Weighing 4.5kg of ammonium persulfate, 2.3kg of sodium sulfite and 6kg of polyethylene glycol diacrylate, dissolving in 25kg of deionized water, adding into a polymerization kettle, adding the obtained acrylic acid and the neutralization solution of the functional monomer N-lysine acrylamide, and carrying out polymerization reaction for 15min at the temperature of 20-60 ℃ to obtain the soft colloid of the super absorbent resin.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 3
The same procedure as in example 3 was repeated except that the N-lysine based acrylamide in example 3 was replaced with the same amount of acrylic acid.
Example 4
Weighing 200kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; 370kg of acrylic acid, 22kg of N-alanyl acrylamide and 80kg of deionized water are added into a neutralization kettle, after uniform stirring and dissolution, the prepared sodium hydroxide aqueous solution is dripped, the temperature of the neutralization kettle is controlled to be lower than 50 ℃, and after dripping is finished, stirring and reacting for 20-30 min.
4.8kg of potassium persulfate, 2.2kg of sodium bisulfite and 6kg of diacetone acrylamide are weighed and dissolved in 28kg of deionized water, added into a polymerization kettle, and the obtained neutralized solution of acrylic acid and functional monomer N-alanyl acrylamide thereof is added, and the polymerization reaction is carried out for 15 minutes at the temperature of 20-60 ℃ to obtain the soft colloid of the super absorbent resin.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 4
The same procedure as in example 4 was repeated except that the N-alanylacrylamide in example 4 was replaced with the same amount of acrylic acid.
Example 5
Weighing 200kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; 370kg of acrylic acid, 16kg of N-serine acrylamide and 90kg of deionized water are added into a neutralization kettle, after uniform stirring and dissolution, the prepared sodium hydroxide aqueous solution is dripped, the temperature of the neutralization kettle is controlled to be lower than 50 ℃, and after dripping is finished, stirring and reacting for 20-30 min.
Weighing 4.8kg of ammonium persulfate, 2.4kg of ascorbic acid and 6.2kg of polyethylene glycol diacrylate, dissolving in 30kg of deionized water, adding into a polymerization kettle, adding the obtained neutralized solution of acrylic acid and functional monomers thereof, and carrying out polymerization reaction for 15min at the temperature of 20-60 ℃ to obtain the super absorbent resin soft colloid.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 5
The same procedure as in example 5 was repeated except that the N-serine acrylamide in example 5 was replaced with the same amount of acrylic acid.
Example 6
Weighing 190kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; 380kg of acrylic acid, 20kg of N-methionine acrylamide and 90kg of deionized water are added into a neutralization kettle, after uniform stirring and dissolution, the prepared sodium hydroxide aqueous solution is dripped, the temperature of the neutralization kettle is controlled to be lower than 50 ℃, and after dripping is finished, stirring and reacting for 20-30 min.
Weighing 4.6kg of ammonium persulfate, 2.3kg of sodium sulfite and 6.2kg of diacetone acrylamide, dissolving in 28kg of deionized water, adding into a polymerization kettle, adding the obtained neutralized solution of acrylic acid and functional monomers thereof, and carrying out polymerization reaction for 15min at the temperature of 20-60 ℃ to obtain the soft colloid of the super absorbent resin.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 6
The same procedure as in example 6 was repeated except that the N-methionoacrylamide in example 6 was replaced with the same amount of acrylic acid.
Example 7
Weighing 200kg of sodium hydroxide, preparing into a 30% aqueous solution, and standing for cooling; 380kg of acrylic acid, 15kg of N-glutamine acrylamide and 80kg of deionized water are added into a neutralization kettle, after uniform stirring and dissolution, the prepared sodium hydroxide aqueous solution is dropwise added, the temperature of the neutralization kettle is controlled to be lower than 50 ℃, and after the dropwise addition is finished, the stirring reaction is carried out for 20-30 min.
Weighing 4.8kg of ammonium persulfate, 2.4kg of sodium sulfite and 6.2kg of diacetone acrylamide, dissolving in 28kg of deionized water, adding into a polymerization kettle, adding the obtained neutralized solution of acrylic acid and functional monomers thereof, and carrying out polymerization reaction for 15min at the temperature of 20-60 ℃ to obtain the soft colloid of the super absorbent resin.
Drying the obtained soft colloid at 100-180 deg.C for 50-120min, and pulverizing into granular material.
Comparative example 7
The same procedure as in example 7 was repeated except that the N-glutamylaminoacrylamide in example 7 was replaced with the same amount of acrylic acid.
TABLE 2 Properties of absorbent resins obtained in examples and comparative examples
The test of the blood sucking amount and the blood sucking speed is carried out according to the method of the national standard GB/T22875-2008; testing the water absorption multiplying power and the water absorption rate according to a method of national standard GB 22905-2008; the saline uptake and rate of saline uptake were performed according to the method of GB22905-2008 except that water was replaced with 0.1% normal saline.
As is apparent from the data shown in Table 2, the outstanding advantage of the present invention is that it has excellent blood-sucking performance, and the blood-sucking amount and the blood-sucking rate are significantly higher than those of the comparative example, while the water absorption amount, the saline absorption amount and the absorption rate are comparable to those of the comparative example.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.