High-absorptivity resin and preparation method thereof

Abstract

The invention relates to the technical field of high-absorptivity resin, in particular to high-absorptivity resin and a preparation method thereof.The high-absorptivity resin comprises a protection pad base layer, a breathable layer and a waterproof layer, one side of the protection pad base layer is connected with the waterproof layer through the breathable layer, and a protection layer is fixedly connected to the middle of the side, away from the breathable layer, of the waterproof layer; a first groove for assembling the mounting piece is formed in the middle of one side, far away from the breathable layer, of the protection pad base layer; the outer side of the mounting piece is fixedly connected with the inner wall of the first groove; a first net layer is fixedly connected to the side, close to the breathable layer, of the first groove, a second net layer is fixedly connected to the side, close to the breathable layer, of the first groove, a second high-absorptivity resin body is further arranged in the first groove, a second groove is formed in the side, away from the second high-absorptivity resin body, of the mounting piece, and the second groove is filled with the first high-absorptivity resin body. The dispersing agent, the solution A, the solution B and the sodium polyacrylate resin are combined in a cross-linking mode, blood can be well absorbed, meanwhile, the gel strength is good, and then the performance of the gel can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of superabsorbent resins, and particularly relates to a superabsorbent resin and a preparation method thereof. Background Art

[0002] Superabsorbent resin is a new type of polymer material that can absorb hundreds to thousands of times its own weight of water, is non-toxic, harmless, and pollution-free; has extremely strong water absorption capacity and extremely high water retention capacity. The high molecular weight polymer obtained by polymerizing acrylic acid → high water retention capacity, balance of absorption amount under high load, the absorbed water cannot be simply extruded by physical methods, and can release and absorb water repeatedly. Existing superabsorbent resins have problems with poor absorption rate, thus reducing their practicality.

[0003] In view of this, in order to overcome the above technical problems, the present invention proposes a superabsorbent resin and a preparation method thereof, which solve the above technical problems. Summary of the Invention

[0004] The main object of the present invention is to provide a superabsorbent resin and a preparation method thereof. By cross-linking a dispersant, solution A, solution B, and sodium polyacrylate resin, it can absorb blood well and also has good gel strength, thereby improving its performance; it can effectively solve the problems in the background art.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A superabsorbent resin includes a protective pad base layer, a breathable layer, and a waterproof layer. One side of the protective pad base layer is connected to the waterproof layer through the breathable layer. A protective layer is fixedly connected to the middle of the side of the waterproof layer away from the breathable layer. A first groove for assembling an installation piece is provided in the middle of the side of the protective pad base layer away from the breathable layer, and the outer side of the installation piece is fixedly connected to the inner wall of the first groove; a second mesh layer is fixedly connected to the side of the first groove close to the breathable layer, and a second superabsorbent resin body is further provided in the first groove. A second groove is provided on the side of the installation piece away from the second superabsorbent resin body, and a first superabsorbent resin body is filled in the second groove. A second adhesive layer for pasting a wood pulp layer is provided on the side of the installation piece away from the protective pad base layer; a gauze layer is fixedly connected to the middle of the side of the protective pad base layer away from the breathable layer at the position where the first groove is located.

[0007] By adopting the above technical solution, the wood pulp, the first superabsorbent resin body, and the second superabsorbent resin body can complement each other. One has strong water absorption and the other has strong water retention capacity. Therefore, the gauze pad composed of the two with a suitable ratio and mixed structure can achieve the best absorption rate and water absorption retention effect, thereby improving its practicality.

[0008] Preferably, the second mesh layer is located between the second high-absorbency resin body and the breathable layer.

[0009] Preferably, a first mesh layer is fixedly adhered by glue to the side of the mounting piece close to the second high-absorbency resin body, and the first mesh layer is located between the mounting piece and the second high-absorbency resin body.

[0010] Preferably, the gauze layer is a circular plate-like structure, a pasting portion fixedly connected to one side of the protection pad base layer is provided at the outer edge of the gauze layer, and an adhesive layer is provided at the position where the protection pad base layer is close to the gauze layer and where the pasting portion is located.

[0011] Preferably, the protection pad base layer, the mounting piece, the first high-absorbency resin body, the second high-absorbency resin body, the first mesh layer, and the second mesh layer are all located between the gauze layer and the breathable layer.

[0012] Preferably, a first bonding layer in a circular ring structure is provided at the outer edge of one side of the protection pad base layer close to the gauze layer.

[0013] Preferably, a release paper is connected to the side of the first bonding layer away from the protection pad base layer, and the release paper is in a circular ring structure.

[0014] A preparation method of a high-absorbency resin, characterized by comprising the following steps

[0015] S1. Weigh a surface dispersant;

[0016] S2. Weigh an initiator, and obtain solution A through thermal decomposition;

[0017] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0018] S4. Mix the surface dispersant, solution A, solution B, and polyacrylate resin;

[0019] S5. Carry out a crosslinking reaction on the above S4 to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, carry out a polymerization reaction under the condition of 40°C - 95°C to obtain a polymerization colloid, and then obtain a biodegradable high-absorbency resin through granulation, drying, pulverization, sieving, and surface treatment;

[0020] S6. Fill the high-absorbency resin in S5 into the first groove and the second groove respectively. The high-absorbency resin in the first groove is the second high-absorbency resin body, and the high-absorbency resin in the second groove is the first high-absorbency resin body; the initiator is a thermal decomposition type initiator, and the initiator is selected from persulfate, hydrogen peroxide, or water-soluble azo.

[0021] The beneficial effects of the present invention:

[0022] 1. A superabsorbent resin and its preparation method according to the present invention can combine a dispersant, solution A, solution B, and sodium polyacrylate resin to absorb blood well and have good gel strength, thereby improving its performance.

[0023] 2. A superabsorbent resin and its preparation method according to the present invention, wood pulp, the first superabsorbent resin body, and the second superabsorbent resin body can complement each other. One has strong water absorption and the other has strong water retention. Therefore, a gauze pad composed of the two with a suitable ratio and mixed structure can achieve the best absorption rate and water absorption retention effect, thereby improving its practicality.

[0024] 3. A superabsorbent resin and its preparation method according to the present invention can achieve the purpose of double guarantee through the design of the first superabsorbent resin body and the second superabsorbent resin body, further improving its practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the drawings and embodiments.

[0026] Figure 1 It is a schematic structural diagram of a superabsorbent resin and its preparation method according to the present invention.

[0027] Figure 2 It is a three-dimensional view of the wood pulp layer of a superabsorbent resin and its preparation method according to the present invention.

[0028] Figure 3 It is a three-dimensional view of the second adhesive layer of a superabsorbent resin and its preparation method according to the present invention.

[0029] Figure 4 It is a three-dimensional view of the mounting piece of a superabsorbent resin and its preparation method according to the present invention.

[0030] Figure 5 It is a three-dimensional view of the first groove of a superabsorbent resin and its preparation method according to the present invention.

[0031] Figure 6 It is a second mesh layer diagram of a superabsorbent resin and its preparation method according to the present invention.

[0032] Figure 7 It is a three-dimensional view of the protective layer of a superabsorbent resin and its preparation method according to the present invention.

[0033] Figure 8 It is a schematic internal structure diagram of the mounting piece of a superabsorbent resin and its preparation method according to the present invention.

[0034] In the figure: 1, the bottom layer of the protective pad; 2, the breathable layer; 3, the waterproof layer; 4, the release paper; 5, the gauze layer; 6, the pasting part; 7, the first adhesive layer; 8, the glue layer; 9, the wood pulp layer; 10, the first groove; 11, the second adhesive layer; 12, the second groove; 13, the first superabsorbent resin body; 14, the first mesh layer; 15, the second superabsorbent resin body; 16, the second mesh layer; 17, the protective layer; 18, the mounting piece. Detailed implementation manners

[0035] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0036] As Figure 1-8 shown, a superabsorbent resin includes a bottom layer 1 of a protective pad, a breathable layer 2 and a waterproof layer 3. One side of the bottom layer 1 of the protective pad is connected to the waterproof layer 3 through the breathable layer 2. A protective layer 17 is fixedly connected to the middle of the side of the waterproof layer 3 away from the breathable layer 2. A first groove 10 for assembling a mounting piece 18 is provided in the middle of the side of the bottom layer 1 of the protective pad away from the breathable layer 2, and the outer side of the mounting piece 18 is fixedly connected to the inner wall of the first groove 10. A second mesh layer 16 is fixedly connected to the side of the first groove 10 close to the breathable layer 2. A second superabsorbent resin body 15 is also provided in the first groove 10. A second groove 12 is provided on the side of the mounting piece 18 away from the second superabsorbent resin body 15, and a first superabsorbent resin body 13 is filled in the second groove 12. A second adhesive layer 11 for pasting a wood pulp layer 9 is provided on the side of the mounting piece 18 away from the bottom layer 1 of the protective pad. A gauze layer 5 is fixedly connected to the middle of the side of the bottom layer 1 of the protective pad away from the breathable layer 2 at the position where the first groove 10 is located.

[0037] The second mesh layer 16 is located between the second superabsorbent resin body 15 and the breathable layer 2. A first mesh layer 14 is fixedly glued to the side of the mounting piece 18 close to the second superabsorbent resin body 15, and the first mesh layer 14 is located between the mounting piece 18 and the second superabsorbent resin body 15. The gauze layer 5 is in a circular plate-like structure, and a pasting part 6 fixedly connected to one side of the bottom layer 1 of the protective pad is provided on the outer edge of the gauze layer 5. A glue layer 8 is provided on the bottom layer 1 of the protective pad close to the gauze layer 5 at the position where the pasting part 6 is located. The bottom layer 1 of the protective pad, the mounting piece 18, the first superabsorbent resin body 13, the second superabsorbent resin body 15, the first mesh layer 14 and the second mesh layer 16 are all located between the gauze layer 5 and the breathable layer 2. A first adhesive layer 7 in a circular ring structure is provided on the outer edge of the side of the bottom layer 1 of the protective pad close to the gauze layer 5. A release paper 4 is connected to the side of the first adhesive layer 7 away from the bottom layer 1 of the protective pad, and the release paper 4 is in a circular ring structure.

[0038] As an embodiment of the present invention, a method for preparing a highly absorbent resin includes the following steps

[0039] S1. Weigh a surface dispersant;

[0040] S2. Weigh an initiator, and through thermal decomposition, obtain solution A;

[0041] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0042] S4. Mix the surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0043] S5. Conduct a cross-linking reaction on the above S4 to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, conduct a polymerization reaction at 40 °C to obtain a polymerization colloid, and then obtain a biodegradable highly absorbent resin after granulation, drying, pulverization, sieving, and surface treatment;

[0044] S6. Fill the highly absorbent resin in S5 into the first groove 10 and the second groove 12 respectively. The highly absorbent resin in the first groove 10 is the second highly absorbent resin body 15, and the highly absorbent resin in the second groove 12 is the first highly absorbent resin body 13.

[0045] The initiator is a thermal decomposition type initiator, and the initiator is selected from persulfates.

[0046] As an embodiment of the present invention, a method for preparing a highly absorbent resin includes the following steps

[0047] S1. Weigh a surface dispersant;

[0048] S2. Weigh an initiator, and through thermal decomposition, obtain solution A;

[0049] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0050] S4. Mix the surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0051] S5. Conduct a cross-linking reaction on the above S4 to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, conduct a polymerization reaction at 45 °C to obtain a polymerization colloid, and then obtain a biodegradable highly absorbent resin after granulation, drying, pulverization, sieving, and surface treatment;

[0052] S6. Fill the highly absorbent resin in S5 into the first groove 10 and the second groove 12 respectively. The highly absorbent resin in the first groove 10 is the second highly absorbent resin body 15, and the highly absorbent resin in the second groove 12 is the first highly absorbent resin body 13.

[0053] The initiator is a thermal decomposition initiator, and the initiator is selected from persulfates.

[0054] As an implementation manner of the present invention, a preparation method of a highly absorbent resin includes the following steps

[0055] S1. Weigh a surface dispersant;

[0056] S2. Weigh an initiator, and obtain solution A through thermal decomposition;

[0057] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0058] S4. Mix the surface dispersant, solution A, solution B and sodium polyacrylate resin;

[0059] S5. Perform a cross-linking reaction on the above S4 to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, and perform a polymerization reaction at 50 °C to obtain a polymerization colloid, and then obtain a biodegradable highly absorbent resin after granulation, drying, pulverization, sieving, and surface treatment;

[0060] S6. Fill the highly absorbent resin in S5 into the first groove 10 and the second groove 12 respectively. The highly absorbent resin in the first groove 10 is the second highly absorbent resin body 15, and the highly absorbent resin in the second groove 12 is the first highly absorbent resin body 13.

[0061] The initiator is a thermal decomposition initiator, and the initiator is selected from hydrogen peroxide.

[0062] As an implementation manner of the present invention, a preparation method of a highly absorbent resin includes the following steps

[0063] S1. Weigh a surface dispersant;

[0064] S2. Weigh an initiator, and obtain solution A through thermal decomposition;

[0065] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0066] S4. Mix the surface dispersant, solution A, solution B and sodium polyacrylate resin;

[0067] S5. Perform a cross-linking reaction on the above S4 to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, and perform a polymerization reaction at 55 °C to obtain a polymerization colloid, and then obtain a biodegradable highly absorbent resin after granulation, drying, pulverization, sieving, and surface treatment;

[0068] S6. Fill the superabsorbent resins in S5 into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0069] The initiator is a heat-decomposable initiator, and the initiator is selected from persulfates.

[0070] As an embodiment of the present invention, a method for preparing a superabsorbent resin includes the following steps

[0071] S1. Weigh a surface dispersant;

[0072] S2. Weigh an initiator, and obtain solution A through thermal decomposition;

[0073] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0074] S4. Mix the surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0075] S5. Perform a crosslinking reaction on the above S4 to obtain a reaction solution, and then add the initiator in step S2 again to the reaction solution, and perform a polymerization reaction at 60°C to obtain a polymer colloid, which is then granulated, dried, pulverized, sieved, and surface-treated to obtain a biodegradable superabsorbent resin;

[0076] S6. Fill the superabsorbent resins in S5 into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0077] The initiator is a heat-decomposable initiator, and the initiator is selected from water-soluble azo.

[0078] As an embodiment of the present invention, a method for preparing a superabsorbent resin includes the following steps

[0079] S1. Weigh a surface dispersant;

[0080] S2. Weigh an initiator, and obtain solution A through thermal decomposition;

[0081] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0082] S4. Mix the surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0083] S5. The reaction solution is obtained by subjecting the above S4 to a cross-linking reaction. Then, the initiator in step S2 is added again to the reaction solution, and a polymerization reaction is carried out at 65 °C to obtain a polymerized colloid, which is then granulated, dried, pulverized, sieved, and surface-treated to obtain a biodegradable superabsorbent resin;

[0084] S6. The superabsorbent resin in S5 is filled into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0085] The initiator is a thermal decomposition type initiator, and the initiator is selected from persulfates.

[0086] As an embodiment of the present invention, a method for preparing a superabsorbent resin includes the following steps

[0087] S1. Weigh a surface dispersant;

[0088] S2. Weigh an initiator, and after thermal decomposition, obtain solution A;

[0089] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0090] S4. Mix the surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0091] S5. The reaction solution is obtained by subjecting the above S4 to a cross-linking reaction. Then, the initiator in step S2 is added again to the reaction solution, and a polymerization reaction is carried out at 70 °C to obtain a polymerized colloid, which is then granulated, dried, pulverized, sieved, and surface-treated to obtain a biodegradable superabsorbent resin;

[0092] S6. The superabsorbent resin in S5 is filled into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0093] The initiator is a thermal decomposition type initiator, and the initiator is selected from persulfates.

[0094] As an embodiment of the present invention, a method for preparing a superabsorbent resin includes the following steps

[0095] S1. Weigh a surface dispersant;

[0096] S2. Weigh an initiator, and after thermal decomposition, obtain solution A;

[0097] S3. Weigh a compound containing an epoxy group and prepare solution B;

[0098] S4, a mixed surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0099] S5, subject the above S4 to a crosslinking reaction to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, carry out a polymerization reaction at 80 °C to obtain a polymeric colloid, and then obtain a biodegradable superabsorbent resin after granulation, drying, pulverization, sieving, and surface treatment;

[0100] S6, fill the superabsorbent resin in S5 into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0101] The initiator is a thermal decomposition type initiator, and the initiator is selected from hydrogen peroxide.

[0102] As an embodiment of the present invention, a method for preparing a superabsorbent resin includes the following steps

[0103] S1, weigh a surface dispersant;

[0104] S2, weigh an initiator, and obtain solution A after thermal decomposition;

[0105] S3, weigh a compound containing an epoxy group and prepare it into solution B;

[0106] S4, mix the surface dispersant, solution A, solution B, and sodium polyacrylate resin;

[0107] S5, subject the above S4 to a crosslinking reaction to obtain a reaction solution, then add the initiator in step S2 again to the reaction solution, carry out a polymerization reaction at 95 °C to obtain a polymeric colloid, and then obtain a biodegradable superabsorbent resin after granulation, drying, pulverization, sieving, and surface treatment;

[0108] S6, fill the superabsorbent resin in S5 into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0109] The initiator is a thermal decomposition type initiator, and the initiator is selected from water-soluble azo.

[0110] It should be noted that the present invention relates to a superabsorbent resin and a preparation method thereof. One side of the base layer 1 of the protection pad is connected to the waterproof layer 3 through the breathable layer 2. At the center of the side of the waterproof layer 3 away from the breathable layer 2, a protective layer 17 is fixedly connected. At the center of the side of the base layer 1 of the protection pad away from the breathable layer 2, a mounting piece 18 is assembled, and the outer side of the mounting piece 18 is fixedly connected to the inner wall of the first groove 10; the base layer 1 of the protection pad, the mounting piece 18, the first superabsorbent resin body 13, the second superabsorbent resin body 15, the first mesh layer 14 and the second mesh layer 16 are all located between the gauze layer 5 and the breathable layer 2;

[0111] When preparing the first superabsorbent resin body 13 and the second superabsorbent resin body 15, first weigh the surface dispersant; weigh the initiator, and after thermal decomposition, obtain solution A; weigh the compound containing epoxy groups and prepare solution B; then mix the surface dispersant, solution A, solution B and sodium polyacrylate resin; crosslink the above to obtain a reaction solution, and then add the initiator again to the reaction solution, and carry out a polymerization reaction at 40 °C - 95 °C to obtain a polymerization colloid, which is then granulated, dried, pulverized, sieved and surface-treated to obtain a biodegradable superabsorbent resin; fill the above superabsorbent resin into the first groove 10 and the second groove 12 respectively. The superabsorbent resin in the first groove 10 is the second superabsorbent resin body 15, and the superabsorbent resin in the second groove 12 is the first superabsorbent resin body 13.

[0112] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A superabsorbent resin, characterized in that, It includes a protective pad base layer (1), a breathable layer (2) and a waterproof layer (3). One side of the protective pad base layer (1) is connected to the waterproof layer (3) through the breathable layer (2). At the center of the side of the waterproof layer (3) away from the breathable layer (2), a protective layer (17) is fixedly connected. At the center of the side of the protective pad base layer (1) away from the breathable layer (2), a first groove (10) for assembling a mounting piece (18) is provided, and the outer side of the mounting piece (18) is fixedly connected to the inner wall of the first groove (10); On the side of the first groove (10) close to the breathable layer (2), a second mesh layer (16) is fixedly connected. In the first groove (10), a second superabsorbent resin body (15) is also provided. On the side of the mounting piece (18) away from the second superabsorbent resin body (15), a second groove (12) is provided, and the second groove (12) is filled with a first superabsorbent resin body (13). On the side of the mounting piece (18) away from the protective pad base layer (1), a second adhesive layer (11) for pasting a wood pulp layer (9) is provided; At the center of the side of the protective pad base layer (1) away from the breathable layer (2) and at the position where the first groove (10) is located, a gauze layer (5) is fixedly connected.

2. The superabsorbent resin according to claim 1, wherein: The second mesh layer (16) is located between the second superabsorbent resin body (15) and the breathable layer (2).

3. The superabsorbent resin according to claim 1, characterized in that: On the side of the mounting piece (18) close to the second superabsorbent resin body (15), a first mesh layer (14) is fixedly adhered, and the first mesh layer (14) is located between the mounting piece (18) and the second superabsorbent resin body (15).

4. The superabsorbent resin according to claim 1, wherein: The gauze layer (5) is in a circular plate-like structure. The outer edge of the gauze layer (5) is provided with a pasting part (6) fixedly connected to one side of the protective pad base layer (1). On the protective pad base layer (1) close to the gauze layer (5) and at the position where the pasting part (6) is located, an adhesive layer (8) is provided.

5. The superabsorbent resin according to claim 1, wherein: The protective pad base layer (1), the mounting piece (18), the first superabsorbent resin body (13), the second superabsorbent resin body (15), the first mesh layer (14) and the second mesh layer (16) are all located between the gauze layer (5) and the breathable layer (2).

6. The superabsorbent resin according to claim 5, wherein: On the outer edge of the side of the protective pad base layer (1) close to the gauze layer (5), a circular ring-shaped first adhesive layer (7) is provided.

7. The superabsorbent resin according to claim 6, characterized in that: On the side of the first adhesive layer (7) away from the protective pad base layer (1), a release paper (4) is connected, and the release paper (4) is in a circular ring-shaped structure.

8. A method for preparing a highly absorbent resin according to any one of claims 1-7, characterized in that: It includes the following steps S1. Weigh a surface dispersant; S2. Weigh an initiator, and through thermal decomposition, obtain solution A; S3. Weigh a compound containing an epoxy group and prepare solution B; S4. Mix the surface dispersant, solution A, solution B and sodium polyacrylate resin; S5. The above S4 is subjected to a cross-linking reaction to obtain a reaction solution, and then in the reaction solution, the initiator in step S2 is added again, and a polymerization reaction is carried out under the condition of 40°C - 95°C to obtain a polymerization colloid, and then through granulation, drying, pulverization, sieving, and surface treatment, a biodegradable superabsorbent resin is obtained; S6. Fill the superabsorbent resins in S5 into the first groove (10) and the second groove (12) respectively. The superabsorbent resin in the first groove (10) is the second superabsorbent resin body (15), and the superabsorbent resin in the second groove (12) is the first superabsorbent resin body (13).

9. The preparation method of a superabsorbent resin according to claim 8, characterized in that: The initiator is a thermal decomposition type initiator, and the initiator is selected from persulfate, hydrogen peroxide or water-soluble azo.

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