CN114106233B - Preparation method of compression-resistant antibacterial super absorbent resin - Google Patents
Preparation method of compression-resistant antibacterial super absorbent resin Download PDFInfo
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Abstract
The invention discloses a preparation method of novel compression-resistant antibacterial super absorbent resin, which comprises the following steps: neutralizing acrylic acid, distilled water and alkali liquor under the ice-water bath condition, and adding quaternary ammonium salt modified bentonite to uniformly disperse the bentonite to obtain reaction liquid; heating the reaction solution to 80-98 ℃, then adding two cross-linking agents and initiators with different activities, rapidly stirring, and carrying out polymerization reaction for 30-90s to obtain super absorbent resin colloid; and (3) stirring, drying, crushing and screening the obtained colloid to obtain a semi-finished product of the super absorbent resin, and carrying out surface crosslinking and antibacterial agent addition treatment on the semi-finished product by using a novel surface crosslinking liquid to obtain a finished product of the super absorbent resin. According to the invention, the bentonite is modified by adopting the quaternary ammonium salt, and different cross-linking agents, novel surface cross-linking liquid and antibacterial agents are added, so that the prepared anti-compression antibacterial SAP has high compression absorptivity and excellent antibacterial performance.
Description
Technical Field
The invention belongs to the technical field of preparation of water-absorbent resins, and particularly relates to a preparation method of a novel compression-resistant antibacterial super-absorbent resin.
Background
Super Absorbent Polymer (SAP) is a novel Polymer material rich in a large number of hydrophilic groups and having a certain degree of crosslinking, and thus has excellent water absorption capacity and water retention capacity, is not prone to water loss even under pressure, and is widely used in the sanitary field of diapers and the like. In SAP produced all over the world at present, polyacrylic acid accounts for more than 85%, and after the SAP absorbs urine, the urine is easy to overflow under pressure due to low absorption rate under pressure, so that the dryness of the product is poor; and because the urine is easy to breed bacteria after being kept for a long time, the reverse urine can cause the skin to generate allergic phenomena such as erythra and the like, and the health of human bodies is damaged. Therefore, the preparation of an SAP having both excellent compressive strength and antibacterial effect is the most urgent development direction at present.
The current methods for increasing the SAP absorption under pressure include increasing the cross-linking density of the SAP, surface cross-linking the SAP product, and grafting inorganic substances. Among them, increasing the crosslink density is a common method, but the water retention property of the SAP under normal pressure is greatly lowered. Surface crosslinking also greatly increases the absorbency under pressure of the SAP, but the corresponding water retention properties also decrease to varying degrees, requiring reasonable control of the amount of surface crosslinking fluid added. Most of the surface cross-linking liquids commonly used at present are mixtures of monohydric alcohol, dihydric alcohol, glycidyl ether and metal compounds, and because the surface cross-linking liquids are small-molecule linear compounds, the steric hindrance in polymer chains on the surfaces of the SAP during the surface cross-linking process is low, so that the SAP enters the interior of the SAP without reacting with hydrophilic groups on the polymer chains in the SAP, and the surface cross-linking is insufficient, the selection of the surface cross-linking liquid capable of making the surface cross-linking of the SAP more sufficient is a necessary means. In the aspect of grafting inorganic matters, bentonite, which is a widely used inorganic filler, provides a huge water storage space due to the controllable interlayer spacing, and a large amount of exchangeable cations between the layers accelerate the absorption rate of an aqueous solution, and simultaneously enhances the osmotic pressure of water molecules entering the layers, and is one of inorganic matters with strong water absorption capacity in the nature. A great deal of researchers have studied on the quaternary ammonium salt, but the study focuses on the modification of interlayer spacing to achieve the aim of improving the dispersibility of the quaternary ammonium salt, wherein the quaternary ammonium salt is best in intercalation modification effect, but the current research results only focus on the intercalation effect of the quaternary ammonium salt, and the quaternary ammonium salt per se has excellent antibacterial capability.
In the aspect of the antibacterial SAP reported previously, the antibacterial agents used are mainly inorganic antibacterial agents and organic antibacterial agents, and the most commonly used of the inorganic antibacterial agents is silver-loaded antibacterial agents, because silver is a metal simple substance with the best antibacterial and bactericidal performance compared with copper, cobalt, nickel and the like, but the silver is active chemically and is easily oxidized into brown silver oxide, and the SAP product is seriously colored by introducing excessive silver-loaded antibacterial agents, so that visual discomfort is caused to consumers, and therefore, the content of the silver-loaded antibacterial agents needs to be properly adjusted. Chitosan antibacterial agents are one of the most actively studied natural organic antibacterial agents, mainly because they have good biocompatibility and broad-spectrum antibacterial property, and their antibacterial properties are more prominent than those of quaternary ammonium salts and are not easy to generate drug resistance, but they show antibacterial activity only under acidic conditions, so they can only exert antibacterial action in specific fields.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a novel pressure-resistant antibacterial super absorbent resin. According to the invention, the crosslinking agents with different activities and the bentonite modified by the quaternary ammonium salt with excellent antibacterial effect are added in the polymerization process, and the SAP has excellent pressure absorption rate and antibacterial capability by adding the novel surface crosslinking liquid and a small amount of antibacterial agent to the surface of the SAP after screening and proportioning.
In order to achieve the purpose, the following technical scheme is provided:
a preparation method of novel pressure-resistant antibacterial super absorbent resin comprises the following steps:
(1) Neutralizing acrylic acid, distilled water and alkali liquor under the ice-water bath condition, adding bentonite modified by quaternary ammonium salt with excellent antibacterial effect, and uniformly dispersing to obtain reaction liquid;
the mass concentration of the aqueous solution of the selected alkaline substance is 46wt%, and the selected alkaline substance is NaOH; the mass ratio of the selected acrylic acid to the alkali liquor is 1.85-0.90; the mass ratio of the selected acrylic acid to the distilled water is 1; the mass ratio of the selected acrylic acid to the quaternary ammonium salt modified bentonite is 1.02-0.06, and the selected quaternary ammonium salt with excellent antibacterial effect is at least one of dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride, alkyl dimethyl hydroxyethyl quaternary ammonium salt and hexadecyl trimethyl ammonium bromide, preferably hexadecyl trimethyl ammonium bromide;
(2) Heating the reaction solution to 80-98 deg.C (preferably 85-95 deg.C, more preferably 88-92 deg.C), adding two kinds of cross-linking agents and initiators with different activities, rapidly stirring, and performing polymerization reaction for 30-90s to obtain SAP colloid;
the structural formula of the selected high-activity crosslinking agent is as follows:
the structural formula of the crosslinking agent with low activity is as follows:
the mol ratio of the selected high-activity crosslinking agent to the low-activity crosslinking agent is 1.8-1.2, and the total mass of the two crosslinking agents is 0.010-0.018% of the mass of the acrylic acid in the step (1); the selected initiator is ammonium persulfate, sodium persulfate or potassium persulfate, preferably ammonium persulfate, and the mass of the initiator is 0.032-0.050% of that of acrylic acid in the step (1);
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Carrying out surface crosslinking on the SAP semi-finished product obtained in the step (3) by using a novel surface crosslinking liquid and adding an antibacterial agent for treatment to obtain a compression-resistant antibacterial SAP finished product;
specifically, uniformly mixing and spraying a surface cross-linking liquid and an antibacterial agent on the surface of the SAP semi-finished product obtained in the step (3), and then drying (185 ℃,1 h), wherein the mass consumption of the surface cross-linking liquid is 2-3% of the mass of the SAP semi-finished product particles obtained in the step (3);
the surface crosslinking liquid is a mixture of a compound A and deionized water, wherein the structural formula of the compound A is as follows:
wherein n =3 or 4,R is a hydroxyl group, an epoxy group or an amino group;
the selected antibacterial agent aqueous solution is one or more of chitosan, silver nitrate and nano silver, and the nano silver is preferred; the specific preparation method of the antibacterial agent aqueous solution comprises the steps of ultrasonically dispersing the antibacterial agent in water; the mass concentration of the aqueous solution of the antibacterial agent is 1-3 percent; the addition amount of the antibacterial agent is 2-4% of the mass of the SAP semi-finished product particles obtained in the step (3).
The invention has the following beneficial effects:
(1) In the step (1), the bentonite modified by quaternary ammonium salt with excellent antibacterial effect is introduced, the bentonite is an inorganic substance with higher strength and excellent water absorption capacity, the gel strength and the pressurized absorption capacity of the SAP can be improved, and the saline absorption rate of the SAP under normal pressure is not greatly influenced; however, the bentonite is not easy to dissolve in organic matters, so that the bentonite is intercalated and modified by quaternary ammonium salt, and the bentonite can be uniformly dispersed in a system; in addition, quaternary ammonium salt also has excellent antibacterial property, and the quaternary ammonium salt is mainly characterized in that cations of the quaternary ammonium salt are mutually attracted with negatively charged bacteria through electrostatic action, hydrogen bonds, hydrophobic combination between surfactant molecules and protein molecules and the like, and are gathered on cell walls of the bacteria to generate a chamber barrier effect, so that cells are prevented from normally growing and die; in addition, the hydrophobic alkyl group can interact with the hydrophilic group of the microorganism to change the permeability, so that the lysis of the microorganism occurs, the cell structure is destroyed, and the cell is dead. Therefore, the bentonite modified by introducing the quaternary ammonium salt with excellent antibacterial effect can not only improve the pressure absorption capacity of the SAP, but also enable the SAP to have certain antibacterial capability.
(2) In the step (2), two cross-linking agents with different activities are added, the cross-linking agent with high activity participates in the polymerization reaction at the initial stage, the cross-linking agent with low activity participates in the polymerization reaction at the middle and later stages, and the content of soluble substances without water absorption capacity is reduced, so that the comprehensive performances such as the pressurized absorption capacity of SAP can be improved.
(3) In the step (4), a novel surface cross-linking liquid is adopted to carry out surface cross-linking treatment on the SAP obtained in the step (3), the compound is rich in hydroxyl, amino or epoxy which can react with carboxyl, and compared with a micromolecule surface cross-linking agent such as monohydric alcohol and the like, the macromolecule surface cross-linking agent is less prone to permeating into the SAP due to steric effect, and the formed core-shell structure is more obvious; in addition, compared with a small molecular linear compound, the planar macromolecular compound can enable the surface of the SAP to have higher crosslinking density, and the formed core-shell structure is more sufficient, so that the pressure absorption capacity of the SAP is remarkably improved.
(4) The antibacterial agent introduced in the step (4) of the invention has higher safety and broad-spectrum antibacterial property. The silver nitrate and the nano silver can make part of enzymes with respiration lose action through the adsorption action of the silver on the microorganisms, so that the microorganisms can die, and the antibacterial property is very strong. The macromolecular chitosan is adsorbed together with the cell surface, so that the permeability of the macromolecular chitosan is obviously reduced, and nutrients are difficult to enter the cell, so that microorganisms die. And (3) carrying out surface treatment on the SAP obtained in the step (3) by using an inorganic antibacterial agent to form a core-shell type antibacterial SAP, wherein the antibacterial capability in the shell is outstanding, and the antibacterial capability in the core is inferior, so that the antibacterial performance of the SAP is obviously improved.
Detailed Description
The invention is further described below by means of specific examples, without the scope of protection of the invention being limited thereto.
Example 1
(1) Neutralizing 100.0g of acrylic acid, 90.0g of water and 87.0g of NaOH solution with the mass concentration of 46wt% in an ice-water bath, adding 2.0g of dodecyl trimethyl ammonium chloride modified bentonite, and stirring to uniformly disperse the bentonite to obtain a reaction solution;
(2) Heating the reaction liquid to 90 ℃, then adding two cross-linking agents with different activities and an initiator, wherein the total mass of the two cross-linking agents is 0.014g, the molar ratio of the high-activity cross-linking agent to the low-activity cross-linking agent is 1:1, and the initiator is potassium persulfate with the content of 0.036g; stirring rapidly, polymerizing for 40s to obtain SAP colloid,
the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The structural formula of the cross-linking agent with lower activity is
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Uniformly mixing the surface cross-linking liquid and the antibacterial agent, uniformly spraying the mixture on the surface of the SAP semi-finished product obtained in the step (3), and drying (185 ℃,1 h); the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is
Wherein n =3;
the mass consumption of the surface cross-linking liquid is 2.5 percent of the mass of the SAP semi-finished product particles obtained in the step (3); the antibacterial agent aqueous solution is silver nitrate aqueous solution with the mass concentration of 2 percent, and the specific preparation method of the antibacterial agent aqueous solution is that the antibacterial agent is dispersed in water by ultrasonic; the addition amount of the antibacterial agent is 2% of the mass of the SAP semi-finished product particles obtained in the step (3).
Example 2
(1) Neutralizing 100.0g of acrylic acid, 90.0g of water and 88.0g of NaOH solution with the mass concentration of 46wt% in an ice-water bath, adding 4.0g of hexadecyl trimethyl ammonium bromide modified bentonite, and stirring to uniformly disperse the bentonite to obtain a reaction solution;
(2) Heating the reaction solution to 92 ℃, then adding two cross-linking agents with different activities and an initiator, wherein the total mass of the two cross-linking agents is 0.014g, the molar ratio of the high-activity cross-linking agent to the low-activity cross-linking agent is 1.2, the initiator selects ammonium persulfate with the content of 0.036g, rapidly stirring, carrying out polymerization reaction for 32s to obtain SAP colloid,
the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The cross-linking agent with lower activity has the structural formula
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Uniformly mixing the surface cross-linking liquid and the antibacterial agent, uniformly spraying the mixture on the surface of the SAP semi-finished product obtained in the step (3), and drying (185 ℃,1 h); the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is
Wherein n =3;
the mass consumption of the surface cross-linking liquid is 2.5% of the mass of the SAP semi-finished product particles obtained in the step (3); the antibacterial agent aqueous solution is nano silver aqueous solution with the mass concentration of 2 percent, and the specific preparation method of the antibacterial agent aqueous solution is that the antibacterial agent is dispersed in water by ultrasonic; the addition amount of the antibacterial agent is 3% of the mass of the SAP semi-finished product particles obtained in the step (3).
Example 3
(1) Neutralizing 100.0g of acrylic acid, 90.0g of water and 88.0g of NaOH solution with the mass concentration of 46wt% in an ice-water bath, adding 6.0g of hexadecyl trimethyl ammonium bromide modified bentonite, and stirring to uniformly disperse the bentonite to obtain a reaction solution;
(2) Heating the reaction solution to 94 ℃, then adding two cross-linking agents with different activities and an initiator, wherein the total mass of the two cross-linking agents is 0.010g, the molar ratio of the high-activity cross-linking agent to the low-activity cross-linking agent is 1.8, and the initiator is ammonium persulfate with the content of 0.044g; stirring rapidly, polymerizing for 55s to obtain SAP colloid,
the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The structural formula of the cross-linking agent with lower activity is
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Uniformly mixing the surface cross-linking liquid and the antibacterial agent, uniformly spraying the mixture on the surface of the SAP semi-finished product obtained in the step (3), and drying (185 ℃ for 1 h), wherein the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is shown in the specification
Wherein n =3;
the mass consumption of the surface cross-linking liquid is 3.0 percent of the mass of the SAP semi-finished product particles obtained in the step (3); the antibacterial agent aqueous solution is silver nitrate aqueous solution with the mass concentration of 2 percent, and the specific preparation method of the antibacterial agent aqueous solution is that the antibacterial agent is dispersed in water by ultrasonic; the addition amount of the antibacterial agent is 4% of the mass of the SAP semi-finished product particles obtained in the step (3).
Example 4
(1) Neutralizing 100.0g of acrylic acid, 88.0g of water and 89.0g of a NaOH solution with the mass concentration of 46wt% in an ice-water bath, adding 5.0g of dodecyl dimethyl benzyl ammonium chloride modified bentonite, and stirring to uniformly disperse the bentonite to obtain a reaction solution;
(2) Heating the reaction solution to 96 ℃, adding two cross-linking agents with different activities and an initiator, wherein the total mass of the two cross-linking agents is 0.018g, the molar ratio of the high-activity cross-linking agent to the low-activity cross-linking agent is 1.8, and the initiator is sodium persulfate with the content of 0.044g; stirring rapidly, polymerizing for 55s to obtain SAP colloid,
the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The structural formula of the cross-linking agent with lower activity is
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Uniformly mixing the surface cross-linking liquid and the antibacterial agent, uniformly spraying the mixture on the surface of the SAP semi-finished product obtained in the step (3), and drying (185 ℃ for 1 h), wherein the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is shown in the specification
Wherein n =4;
the mass consumption of the surface cross-linking liquid is 3.0 percent of the mass of the SAP semi-finished product particles obtained in the step (3); the antibacterial agent aqueous solution is chitosan aqueous solution with the mass concentration of 1 percent, and the specific preparation method of the antibacterial agent aqueous solution is that the antibacterial agent is dispersed in water by ultrasonic; the addition amount of the antibacterial agent is 3% of the mass of the SAP semi-finished product particles obtained in the step (3).
Example 5
(1) Neutralizing 100.0g of acrylic acid, 90.0g of water and 87.5g of NaOH solution with the mass concentration of 46wt% in an ice-water bath, adding 2.0g of dodecyl trimethyl ammonium chloride modified bentonite, and stirring to uniformly disperse the bentonite to obtain a reaction solution;
(2) Heating the reaction solution to 95 ℃, adding two cross-linking agents with different activities and an initiator, wherein the total mass of the two cross-linking agents is 0.016g, the molar ratio of the high-activity cross-linking agent to the low-activity cross-linking agent is 1:1, and the initiator is ammonium persulfate with the content of 0.050g; stirring rapidly, polymerizing for 30s to obtain SAP colloid,
the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The structural formula of the cross-linking agent with lower activity is
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Uniformly mixing the surface cross-linking liquid and the antibacterial agent, uniformly spraying the mixture on the surface of the SAP semi-finished product obtained in the step (3), and drying (185 ℃ for 1 h), wherein the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is shown in the specification
Wherein n =4;
the mass consumption of the surface cross-linking liquid is 2.0 percent of the mass of the SAP semi-finished product particles obtained in the step (3); the antibacterial agent aqueous solution is a nano-silver aqueous solution with the mass concentration of 3 percent, and the specific preparation method of the antibacterial agent aqueous solution is that the antibacterial agent is dispersed in water by ultrasonic; the addition amount of the antibacterial agent is 2% of the mass of the SAP semi-finished product particles obtained in the step (3).
Example 6
(1) Neutralizing 100.0g of acrylic acid, 89.0g of water and 88.5g of NaOH solution with the mass concentration of 46wt% in an ice-water bath, adding 4.0g of dodecyl dimethyl benzyl ammonium chloride modified bentonite, and stirring to uniformly disperse the bentonite to obtain a reaction solution;
(2) Heating the reaction liquid to 90 ℃, then adding two cross-linking agents with different activities and an initiator, wherein the total mass of the two cross-linking agents is 0.014g, the molar ratio of the high-activity cross-linking agent to the low-activity cross-linking agent is 1.2, and the initiator is potassium persulfate with the content of 0.032g; stirring rapidly, polymerizing for 60s to obtain SAP colloid,
the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The structural formula of the cross-linking agent with lower activity is
(3) Smashing the SAP colloid obtained in the step (2), drying (190 ℃,1 h), crushing and screening to obtain a semi-finished SAP product;
(4) Uniformly mixing the surface cross-linking liquid and the antibacterial agent, uniformly spraying the mixture on the surface of the SAP semi-finished product obtained in the step (3), and drying (185 ℃ for 1 h), wherein the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is shown in the specification
Wherein n =4;
the mass consumption of the surface cross-linking liquid is 2.3 percent of the mass of the SAP semi-finished product particles obtained in the step (3); the aqueous solution of the selected antibacterial agent is silver nitrate aqueous solution with the mass concentration of 2 percent, and the specific preparation method of the aqueous solution of the antibacterial agent is that the antibacterial agent is dispersed in water by ultrasonic; the addition amount of the antibacterial agent is 2.5 percent of the mass of the SAP semi-finished product particles obtained in the step (3).
Comparative example 1:
the difference from example 2 is that the operation conditions were the same as in example 2 except that no quaternary ammonium salt-modified bentonite was used.
Comparative example 2:
the difference from example 2 is that only one equimolar amount of low-reactive crosslinker is introduced, and the other operating conditions are the same as in example 2.
Comparative example 3:
the difference from example 2 is that the SAP is not surface cross-linked and the other operating conditions are the same as example 2.
Comparative example 4:
the difference from example 2 is that the inorganic antibacterial agent was not introduced, and other operating conditions were the same as example 2.
The results of the performance tests of examples and comparative examples are shown in table 1 below, and the performance test methods in examples and comparative examples are as follows: 1. water absorption performance: detecting according to the GB/T22905-2008 'paper diaper high-absorptivity resin'; 2. antibacterial property: testing according to GB/T20944.3-2008 standard.
TABLE 1 test results of examples and comparative examples
From the table above, it can be seen that the bentonite modified by the quaternary ammonium salt introduced in the polymerization process can significantly improve the pressurized absorption capacity of the SAP, and in addition, the bacteriostatic rate of the two microorganisms is also significantly improved; the novel surface cross-linking liquid is used for carrying out surface cross-linking on SAP semi-finished product particles, so that the pressurized absorption rate of the SAP is obviously improved, and the free expansion rate is basically unchanged; in addition, in the surface treatment stage, a small amount of antibacterial agent is added to form a core-shell structure, so that the antibacterial rate of the SAP can be obviously improved; the addition of two different reactive cross-linking agents further increases the overall water absorption of the SAP compared to a single reactive cross-linking agent.
Claims (8)
1. The preparation method of the pressure-resistant antibacterial super absorbent resin is characterized by comprising the following steps of:
1) Neutralizing acrylic acid, distilled water and alkali liquor under the ice-water bath condition, and adding quaternary ammonium salt modified bentonite to uniformly disperse the bentonite to obtain reaction liquid;
2) Heating the reaction solution obtained in the step 1) to 80-98 ℃, adding two cross-linking agents and initiators with different activities, rapidly stirring, and carrying out polymerization reaction for 30-90s to obtain a super absorbent resin colloid;
3) Stirring, drying, crushing and screening the colloid obtained in the step 2) to obtain a semi-finished product of the super absorbent resin;
4) Carrying out surface crosslinking on the semi-finished product of the super absorbent resin obtained in the step 3) by using a surface crosslinking liquid and adding an antibacterial agent for treatment to obtain a finished product of the super absorbent resin;
the total mass of the two cross-linking agents with different activities in the step 2) is 0.010-0.018% of the mass of the acrylic acid in the step 1), and the structural formula of the cross-linking agent with higher activity in the two cross-linking agents with different activities is shown in the specification
The structural formula of the cross-linking agent with lower activity is shown in the specification
The molar ratio of the cross-linking agent with higher activity to the cross-linking agent with lower activity is 1;
the surface cross-linking liquid is a mixture of a compound A and deionized water, and the structural formula of the compound A is
，
Wherein n =3 or 4,R is a hydroxyl group, an epoxy group or an amino group.
2. The method for preparing the anti-compression antibacterial super absorbent resin as claimed in claim 1, wherein the mass concentration of the alkali solution in step 1) is 46wt%, wherein the alkaline substance is NaOH, the mass ratio of acrylic acid to the alkali solution is 1.
3. The method for preparing the anti-compression antibacterial super absorbent resin as claimed in claim 1 or 2, wherein the quaternary ammonium salt is one of dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride, and hexadecyl trimethyl ammonium bromide.
4. The method for preparing the anti-compression antibacterial super absorbent resin as claimed in claim 1, wherein the initiator in the step 2) is ammonium persulfate, sodium persulfate or potassium persulfate; the mass of the initiator is 0.032-0.050% of that of the acrylic acid in the step 1).
5. The method for preparing the anti-compression and anti-bacterial super absorbent resin as claimed in claim 1, wherein the specific operation process of step 4) is to uniformly mix the surface cross-linking liquid and the aqueous solution of the anti-bacterial agent, spray the mixture on the surface of the semi-finished super absorbent resin, and dry the semi-finished super absorbent resin at 185 ℃.
6. The method for preparing a super absorbent resin with antibacterial and compression-resistant properties as claimed in claim 1, wherein the amount of the surface cross-linking liquid is 2.0-3.0% of the mass of the semi-finished super absorbent resin.
7. The method for preparing a super absorbent resin with anti-compression and anti-bacteria functions as claimed in claim 1 or 5, wherein the mass concentration of the aqueous solution of the anti-bacteria agent is 1-3%, the anti-bacteria agent is one of chitosan, silver nitrate and nano silver, and the addition amount of the anti-bacteria agent is 2-4% of the mass of the semi-finished super absorbent resin.
8. The method for preparing the anti-pressure anti-bacterial super absorbent resin as claimed in claim 5, wherein the aqueous solution of the anti-bacterial agent is prepared by dispersing the anti-bacterial agent in water by ultrasound.
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| CN113683718A (en) * | 2021-08-13 | 2021-11-23 | 浙江工业大学 | Preparation method of low reverse osmosis high water absorption resin suitable for sanitary articles |
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| CN107556500A (en) * | 2017-08-08 | 2018-01-09 | 浙江卫星新材料科技有限公司 | A kind of preparation method and applications of bacteriostasis, and deodorization super absorbent resin |
| CN113683718A (en) * | 2021-08-13 | 2021-11-23 | 浙江工业大学 | Preparation method of low reverse osmosis high water absorption resin suitable for sanitary articles |
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| 有机改性膨润土与复合高吸水性树脂的性能研究;唐宏科，等;《精细石油化工》;20120331;第29卷(第2期);第74-77页 * |
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