阅读说明：本技术 一种高吸水性树脂、高吸水性树脂的制备方法以及应用 (Super absorbent resin, preparation method and application thereof ) 是由 刘妙锋 程程 陈东飞 韩露 于 2019-11-05 设计创作，主要内容包括：本发明公开了一种高吸水性树脂、高吸水性树脂的制备方法以及应用,属于吸水性树脂领域领域,其高吸水性树脂的技术方案要点是原料按重量份包括丁腈橡胶100-126份、聚氨酯65-85份、纳米碳管12-18份、塔拉胶8-16份、引发剂0.7-1.2份、吸水剂1.4-1.8份、交联剂1.1-1.4份、水4-8份；高吸水性树脂的制备方法,包括如下步骤：S1：将重量份的吸水剂、水和塔拉胶混合,搅拌,使得吸水剂完全溶解后,加热升温至55℃-65℃；S2：向S1中加入重量份的引发剂和纳米碳管,搅拌20-40min；S3：向S2中加入重量份的丁腈橡胶、聚氨酯和交联剂,然后升温至75℃-85℃,持续搅拌反应3h；S4：将S3中的产物冷却至室温,达到提高吸水性树脂的耐盐性能,从而提高吸水树脂的吸水性能的效果。(The invention discloses a high water-absorbing resin, a preparation method and application thereof, belonging to the field of water-absorbing resin, wherein the technical scheme of the high water-absorbing resin is characterized in that the raw materials comprise, by weight, 126 parts of nitrile rubber 100-126 parts, 65-85 parts of polyurethane, 12-18 parts of carbon nanotubes, 8-16 parts of tala gum, 0.7-1.2 parts of an initiator, 1.4-1.8 parts of a water absorbent, 1.1-1.4 parts of a cross-linking agent and 4-8 parts of water; the preparation method of the super absorbent resin comprises the following steps: s1: mixing water absorbent, water and tara gum in parts by weight, stirring to completely dissolve the water absorbent, and heating to 55-65 ℃; s2: adding initiator and carbon nanotube in the weight portion into S1, and stirring for 20-40 min; s3: adding the nitrile rubber, the polyurethane and the cross-linking agent in parts by weight into S2, heating to 75-85 ℃, and continuously stirring for reacting for 3 hours; s4: and cooling the product in the step S3 to room temperature to improve the salt resistance of the water-absorbent resin, thereby improving the water absorption performance of the water-absorbent resin.)

1. A super absorbent resin is characterized in that: the raw materials comprise, by weight, 126 parts of nitrile rubber 100, 65-85 parts of polyurethane, 12-18 parts of carbon nanotubes, 8-16 parts of tara gum, 0.7-1.2 parts of an initiator, 1.4-1.8 parts of a water absorbent, 1.1-1.4 parts of a cross-linking agent and 4-8 parts of water.

2. The super absorbent resin according to claim 1, wherein: the raw materials comprise 118 parts of nitrile rubber 108-plus, 70-80 parts of polyurethane, 13-17 parts of carbon nano-tubes, 10-14 parts of tara gum, 0.9-1.1 parts of initiator, 1.5-1.7 parts of water absorbent, 1.1-1.3 parts of cross-linking agent and 5-7 parts of water by weight.

3. The super absorbent resin according to claim 1, wherein: the initiator comprises one or more of potassium persulfate, ammonium persulfate and dicumyl peroxide.

4. The super absorbent resin according to claim 1, wherein: the water absorbent comprises polyvinyl alcohol and polyacrylamide, and the weight ratio of the polyvinyl alcohol to the polyacrylamide is 1.1-1.6: 0.9-1.5.

5. The super absorbent resin according to claim 1, wherein: the cross-linking agent is N, N-methylene bisacrylamide.

6. The super absorbent resin according to claim 1, wherein: the raw materials also comprise 0.6 to 1.2 parts by weight of bacteriostatic agent, and the bacteriostatic agent comprises 10 to 16 parts by weight of chitosan quaternary ammonium salt and 6 to 12 parts by weight of polyquaternium.

7. The method for preparing the super absorbent resin according to claim 1, comprising the steps of:

s1: mixing water absorbent, water and tara gum in parts by weight, stirring to completely dissolve the water absorbent, and heating to 55-65 ℃;

s2: adding initiator and carbon nanotube in the weight portion into S1, and stirring for 20-40 min;

s3: adding the nitrile rubber, the polyurethane and the cross-linking agent in parts by weight into S2, heating to 75-85 ℃, and continuously stirring for reacting for 3 hours;

s4: and cooling the product in the S3 to room temperature to obtain the super absorbent resin.

8. The method for preparing a super absorbent resin according to claim 7, wherein: 0.6-1.2 parts by weight of bacteriostatic agent is added in step S2.

9. Use of the superabsorbent resin prepared according to claim 8 in paper diapers.

Technical Field

The invention relates to the field of water-absorbent resins, and particularly relates to a super-absorbent resin, a preparation method and application thereof.

Background

The super absorbent resin is a functional polymer material which contains strong hydrophilic groups and has a certain degree of crosslinking and is developed in recent years, and the previously used adsorbing materials such as paper, cotton, hemp and the like have the water absorption capacity which is 15 to 40 times of the self weight and have quite poor water retention capacity. In the middle of the 70 s, super absorbent resins appeared, which were insoluble in water and organic solvents, capable of absorbing hundreds to thousands of times their own weight of water, and had strong water retentivity, thus attracting attention of countries in the world.

The super absorbent resin is swollen immediately after swelling upon absorbing water to become hydrogel, so that the liquid is kept in a non-flowing state and is difficult to separate even when pressurized, as compared with conventional water absorbent materials, but most of the super absorbent resins are polyacrylate type, and the polyacrylate type resin has poor salt resistance, so that the water absorption rate of the water absorbent resin in the presence of salt ions such as urine is remarkably reduced, thereby limiting the practical application of the water absorbent resin.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a high water-absorbent resin, which achieves the effect of improving the salt resistance of the water-absorbent resin so as to improve the water absorption performance of the water-absorbent resin.

The first technical purpose of the invention is realized by the following technical scheme:

the high water absorption resin comprises, by weight, 126 parts of nitrile rubber 100, 65-85 parts of polyurethane, 12-18 parts of carbon nanotubes, 8-16 parts of tara gum, 0.7-1.2 parts of an initiator, 1.4-1.8 parts of a water absorbent, 1.1-1.4 parts of a cross-linking agent and 4-8 parts of water.

By adopting the technical scheme, the nitrile rubber contains-CN groups with extremely strong polarity, so that the nitrile rubber and polyurethane have good compatibility and excellent stability, and meanwhile, due to the polarity of the nitrile rubber, a rubber matrix and a hydrophilic agent can be fully compatible, and the water absorption collision performance of the water absorbent resin is improved. Polar nitrile rubber and hydrophilic polyurethane active resin macromolecules of double bond end capping are twisted with each other with the molecular main chain of nitrile rubber matrix under the action of cross-linking agent and initiator, so that the polyurethane macromolecules are chemically grafted to the molecular chain of nitrile rubber, after the water-absorbent resin and water are reacted, the medium hydrogen bond of the water-absorbent resin is continuously generated, the internal molecular structure of the water-absorbent resin is stable, therefore, the problem that partial molecules are separated out due to chain breaking is avoided, the structure is stable, in the water loss process, the hydrogen bond is continuously broken, the water molecules fall off, the water-absorbent resin basically recovers to the original shape under the action of intermolecular attraction, and the water absorption performance of the water-absorbent resin is effectively improved.

The tara gum is a natural and reproducible water-soluble high polymer material, can effectively improve the water absorption performance and the stability of the water-absorbent resin by adding the tara gum into the water-absorbent resin, and can be dissolved in hot water and cold water, so that when the tara gum is added into the water-absorbent resin, the tara gum expands after the water-absorbent resin absorbs water, thereby effectively improving the water absorption performance of the water-absorbent resin, and meanwhile, the tara gum also has good water retention performance.

The carbon nano-tube has large specific surface area, so that the carbon nano-tube has excellent adsorption performance, and the carbon nano-tube has a hollow structure, thereby effectively improving the water absorption performance of the water-absorbent resin and simultaneously effectively improving the salt resistance of the water-absorbent resin.

The invention is further set that the raw materials comprise 118 parts of nitrile rubber 108-.

The invention further provides that the initiator comprises one or more of potassium persulfate, ammonium persulfate and dicumyl peroxide.

By adopting the technical scheme, potassium persulfate, ammonium persulfate and dicumyl peroxide are used as initiators, so that the increase of active points in the cross-linking process of the nitrile rubber and the polyurethane is facilitated, the grafting rate of the nitrile rubber and the polyurethane is facilitated to be improved, and the water absorption of the water-absorbent resin is facilitated to be improved.

The invention is further configured that the water absorbent comprises polyvinyl alcohol and polyacrylamide, and the weight ratio of the polyvinyl alcohol to the polyacrylamide is 1.1-1.6: 0.9-1.5.

By adopting the technical scheme, the currently used water absorbent is mainly sodium polyacrylate which is extremely sensitive to metal ions in liquid, so that the hydrophilicity of a macromolecular chain of the sodium polyacrylate disappears, the sodium polyacrylate shrinks, and when the concentration of cations in a medium is continuously increased, the expansion ratio of the sodium polyacrylate is also reduced, so that the salt tolerance of the water absorbent resin is poor. The hydrophilic group in the polyacrylamide is a nonionic group, and is not dissociated in an aqueous medium, and the metal cations in the water cannot form chemical cross-linking bonds with the hydrophilic group to lose hydrophilicity, so that the water-swelling multiplying power is reduced, good salt resistance is shown, and the water absorption performance of the water-absorbent resin is effectively improved.

Under the action of the cross-linking agent, polyvinyl alcohol, polyurethane and nitrile rubber form a compact grid cross-linked structure, so that a polyvinyl alcohol molecular chain and a nitrile rubber molecular chain are wound and curled mutually, after the water-absorbent resin absorbs water, some groups in the cross-linked structure are dissociated out of the grid, the remaining charged groups repel each other, and a high molecular chain is fully expanded, so that the water absorption space of the water-absorbent resin is expanded, and the water absorption performance of the water-absorbent resin is improved. In addition, the polyvinyl alcohol and the polyacrylamide are used in a matching way, so that the salt resistance of the water-absorbent resin is improved, and the water absorption performance of the water-absorbent resin is effectively improved.

The invention is further configured that the cross-linking agent is N, N-methylene bisacrylamide.

The invention is further set that the raw materials also comprise 0.6 to 1.2 parts of bacteriostatic agent according to the parts by weight, and the bacteriostatic agent comprises 10 to 16 parts of chitosan quaternary ammonium salt and 6 to 12 parts of polyquaternary ammonium salt.

By adopting the technical scheme, the chitosan quaternary ammonium salt and the polyquaternary ammonium salt both have good antibacterial property, meanwhile, the chitosan quaternary ammonium salt and the polyquaternary ammonium salt are good in water solubility, and the water absorption property of the water-absorbent resin can be improved.

Object two of the present invention: provides a preparation method of a high water-absorption resin, which comprises the following steps:

s1: mixing water absorbent, water and tara gum in parts by weight, stirring to completely dissolve the water absorbent, and heating to 55-65 ℃;

s2: adding initiator and carbon nanotube in the weight portion into S1, and stirring for 20-40 min;

s3: adding the nitrile rubber, the polyurethane and the cross-linking agent in parts by weight into S2, heating to 75-85 ℃, and continuously stirring for reacting for 3 hours;

s4: and cooling the product in the S3 to room temperature to obtain the super absorbent resin.

By adopting the technical scheme, the water absorbent and the tara gum are both easy to dissolve in water, and the water absorbent and the tara gum are dissolved firstly, so that the dissolved tara gum and the water absorbent wrap the carbon nano-tube, the compatibility of the carbon nano-tube with polyurethane and nitrile rubber is improved, the carbon nano-tube is favorably and fully diffused into a cross-linked structure, the cross-linked density of the nitrile rubber and the polyurethane is increased, the increase of grid results is facilitated, and the water absorption performance of the water absorbent resin is indirectly improved.

The invention is further provided that 0.6 to 1.2 parts by weight of bacteriostatic agent is added in the step S2.

By adopting the technical scheme, the antibacterial agent is added in the step S2, so that the antibacterial agent is favorably and fully diffused, the antibacterial agent is favorably and fully diffused in the cross-linked body of the nitrile rubber and the polyurethane, and the water absorption performance and the antibacterial performance of the water absorbent resin are effectively improved.

The third purpose of the invention is that: provides the application of the super absorbent resin in the paper diaper.

In conclusion, the invention has the following beneficial effects:

1. the nitrile rubber and the polyurethane are mutually wound in the cross-linking process, so that the internal molecular structure of the water-absorbent resin is stable after water absorption, the problem of molecular chain breakage separation does not exist, the structure is stable, and meanwhile, the water-absorbent resin can expand due to the addition of the tara gum and the carbon nano-tubes, so that the water-absorbent resin has good water retention performance and salt resistance;

2. the addition of the polyvinyl alcohol and the polyacrylamide effectively improves the salt resistance of the water-absorbent resin, thereby improving the water absorption performance of the water-absorbent resin;

3. the bacteriostatic agent is added, so that the bacteriostatic performance of the water-absorbent resin can be improved, and the water absorption performance of the water-absorbent resin can be further improved.

Detailed Description

The present invention will be described in further detail with reference to examples.