A water-absorbent non-woven fabric

Abstract

The invention discloses a kind of water-absorbing non-woven fabric, including two layers of modified non-woven fabric layers and the water-absorbing layer between the two layers of modified non-woven fabric layers; wherein the non-woven fabric is grafted with N vinyl formamide to form polyvinylamine, and the non-woven fabric is modified so that the non-woven fabric surface has amino group, and the propionic acid water-absorbing resin is added with 1,2-epoxy-3-(propyleneoxy) propane during the preparation process, which can be copolymerized with acrylic acid and acrylamide, while bringing in epoxy group, so that the water-absorbing resin surface has epoxy group. When preparing the non-woven fabric, trimethylaluminum DMF solution is applied, mainly to play the role of a catalyst, so that the epoxy group can react with amino group, so that the non-woven fabric and the water-absorbing resin can produce a chemical bond, so as to have better peel strength.

Description

Technical Field

[0001] The present invention relates to the field of polymers, and more particularly to a water-absorbing nonwoven fabric. Background Art

[0002] PP non-woven fabric is a non-toxic, odorless, milky white, highly crystalline polymer. It is one of the lightest types of all plastics currently available and is particularly stable to water, with a water absorption rate of only 0.01% in water over 14 hours. Its molecular weight is approximately 80,000 to 150,000, and it has good formability.

[0003] In many scenarios, it is necessary to have good water absorption capacity. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a water-absorbent nonwoven fabric.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A water-absorbent nonwoven fabric,

[0007] The invention comprises two modified non-woven fabric layers and a water-absorbing layer located between the two modified non-woven fabric layers;

[0008] The modified nonwoven fabric layer is prepared by the following method:

[0009] Step A: Take N-vinylformamide and dissolve it in deionized water to obtain solution A;

[0010] Step B: dissolving benzophenone in acetone to obtain solution B;

[0011] Step C: uniformly mixing solution A and solution B on an ultrasonic instrument to obtain a modified solution;

[0012] Step D: soaking the PP non-woven fabric in the modified solution and reacting under ultraviolet light;

[0013] Step E: After the reaction is completed, the non-woven fabric is taken out, washed with water, ethanol, and acetone in sequence, and finally dried in an oven at 60°C to obtain the modified non-woven fabric;

[0014] The water absorbing layer is prepared by the following method:

[0015] Step a: neutralizing acrylic acid with sodium hydroxide, and then mixing with acrylic acid amide, 1,2-epoxy-3-(propyleneoxy)propane, and deionized water;

[0016] Step b: adding a cross-linking agent, stirring and heating continuously, and then adding an initiator to react to obtain a water-absorbing gel.

[0017] As a further improvement of the present invention,

[0018] The mass ratio of N-vinylformamide to deionized water in step A is 1:10;

[0019] The mass ratio of benzophenone to acetone in step B is 1:200;

[0020] In step C, the mass ratio of solution A to solution B is 1:1;

[0021] In the step D, the UV lamp irradiation time is 3 to 10 minutes.

[0022] As a further improvement of the present invention,

[0023] The cross-linking agent in step b is N,N-methylenebisacrylamide;

[0024] The initiator is potassium persulfate.

[0025] As a further improvement of the present invention,

[0026] In the step a, the mass ratio of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane is 8:4:1:37;

[0027] In the step a, the amount of the crosslinking agent is 0.1 wt% of the total mass of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane, and the amount of the initiator is 0.3 wt% of the total mass of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane.

[0028] As a further improvement of the present invention,

[0029] In the step a, sodium hydroxide neutralizes acrylic acid, and the neutralization is stopped when the neutralization degree reaches 65%.

[0030] As a further improvement of the present invention,

[0031] In the step b, the reaction temperature is 55-65°C.

[0032] As a further improvement of the present invention,

[0033] The non-woven fabric preparation method is:

[0034] Apply 0.5% by mass of trimethylaluminum DMF solution on the modified non-woven fabric;

[0035] The side of one layer of modified non-woven fabric coated with trimethylaluminum DMF solution is coated with water-absorbing gel, and then covered with another layer of modified non-woven fabric, and the side coated with trimethylaluminum DMF solution is brought into contact with the water-absorbing gel, and pressed at 60-80°C to form a multi-layer composite water-absorbing non-woven fabric.

[0036] The water-absorbing nonwoven fabric of the present invention is mainly by three-layer structure, and the middle layer is acrylic acid water-absorbing resin, which is also common high-efficiency water-absorbing polymer, and acrylic acid water-absorbing resin is clamped by nonwoven fabrics, and water absorption in the middle is obtained, the nonwoven fabrics of both sides are hydrophobic.Wherein nonwoven fabrics is through the grafting of N-vinyl formamide, forms polyvinylamine, and nonwoven fabrics is modified so that the nonwoven surface has amino, and propionic acid water-absorbing resin then adds 1,2-epoxy-3-(propylene radical oxygen base) propane in preparation process, it can be copolymerized with acrylic acid and acrylic acid amide, has brought epoxy group into simultaneously, so that the water-absorbing resin surface has epoxy group.When preparing nonwoven fabrics, trimethyl aluminum DMF solution is smeared, mainly plays the effect of a catalyst, so that epoxy group can react with amino, thereby nonwoven fabrics and water-absorbing resin can produce chemical bond, thereby having better peel strength. DETAILED DESCRIPTION

[0037] Example:

[0038] A water-absorbent nonwoven fabric,

[0039] The invention comprises two modified non-woven fabric layers and a water-absorbing layer located between the two modified non-woven fabric layers;

[0040] The modified nonwoven fabric layer is prepared by the following method:

[0041] Step A: Take N-vinylformamide and dissolve it in deionized water to obtain solution A;

[0042] Step B: dissolving benzophenone in acetone to obtain solution B;

[0043] Step C: uniformly mixing solution A and solution B on an ultrasonic instrument to obtain a modified solution;

[0044] Step D: soaking the PP non-woven fabric in the modified solution and reacting under ultraviolet light;

[0045] Step E: After the reaction is completed, the non-woven fabric is taken out, washed with water, ethanol, and acetone in sequence, and finally dried in an oven at 60°C to obtain the modified non-woven fabric;

[0046] The water absorbing layer is prepared by the following method:

[0047] Step a: neutralizing acrylic acid with sodium hydroxide, and then mixing with acrylic acid amide, 1,2-epoxy-3-(propyleneoxy)propane, and deionized water;

[0048] Step b: adding a cross-linking agent, stirring and heating continuously, and then adding an initiator to react to obtain a water-absorbing gel.

[0049] The mass ratio of N-vinylformamide to deionized water in step A is 1:10;

[0050] The mass ratio of benzophenone to acetone in step B is 1:200;

[0051] In step C, the mass ratio of solution A to solution B is 1:1;

[0052] In step D, the UV lamp irradiation time is 5 minutes.

[0053] The cross-linking agent in step b is N,N-methylenebisacrylamide;

[0054] The initiator is potassium persulfate.

[0055] In the step a, the mass ratio of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane is 8:4:1:37;

[0056] In the step a, the amount of the crosslinking agent is 0.1 wt% of the total mass of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane, and the amount of the initiator is 0.3 wt% of the total mass of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane.

[0057] In the step a, sodium hydroxide neutralizes acrylic acid, and the neutralization is stopped when the neutralization degree reaches 65%.

[0058] In the step b, the reaction temperature is 60°C.

[0059] The non-woven fabric preparation method is:

[0060] Apply 0.5% by mass of trimethylaluminum DMF solution on the modified non-woven fabric;

[0061] The side of one layer of modified non-woven fabric coated with trimethylaluminum DMF solution is coated with a water-absorbing gel, and then covered with another layer of modified non-woven fabric. The side coated with trimethylaluminum DMF solution is brought into contact with the water-absorbing gel, and pressed at 80°C to form a multi-layer composite water-absorbing non-woven fabric.

[0062] Comparative Example:

[0063] The invention comprises two non-woven fabric layers and a water-absorbing layer located between the two non-woven fabric layers;

[0064] The water absorbing layer is prepared by the following method:

[0065] Step a: neutralizing acrylic acid with sodium hydroxide, and then mixing it with acrylic acid amide and deionized water; Step b: adding a crosslinking agent, continuously stirring and heating, and then adding an initiator to react to obtain a water-absorbing gel.

[0066] The mass ratio of N-vinylformamide to deionized water in step A is 1:10;

[0067] The mass ratio of benzophenone to acetone in step B is 1:200;

[0068] In step C, the mass ratio of solution A to solution B is 1:1;

[0069] In step D, the UV lamp irradiation time is 5 minutes.

[0070] The cross-linking agent in step b is N,N-methylenebisacrylamide;

[0071] The initiator is potassium persulfate.

[0072] In step a, the mass ratio of acrylic acid to acrylic acid amide is 8:4:1:37;

[0073] In the step a, the amount of the crosslinking agent is 0.1 wt% of the total mass of acrylic acid and acrylamide, and the amount of the initiator is 0.3 wt% of the total mass of acrylic acid and acrylamide.

[0074] In the step a, sodium hydroxide neutralizes acrylic acid, and the neutralization is stopped when the neutralization degree reaches 65%.

[0075] In the step b, the reaction temperature is 60°C.

[0076] The non-woven fabric preparation method is:

[0077] Apply 0.5% by mass of trimethylaluminum DMF solution on the modified non-woven fabric;

[0078] The side of one layer of non-woven fabric coated with trimethylaluminum DMF solution is coated with water-absorbing gel, and then covered with another layer of non-woven fabric, and the side coated with trimethylaluminum DMF solution is brought into contact with the water-absorbing gel, and pressed at 80°C to form a multi-layer composite water-absorbing non-woven fabric.

[0079]

[0080]

[0081] test:

[0082] Liquid absorption performance test: Take the composite non-woven fabric prepared in the embodiment and comparative example, record the original weight m, fully soak it in deionized water, absorb liquid, take it out after washing, and hang it in the air until no liquid drips. At this time, record the mass M, and the water absorption rate Q = (Mm) / m.

[0083] Peel strength test: GB8808-1988

[0084] Water absorption % Peel strength N / m Example 312 95 Comparative Example 308 36

[0085] The water-absorbing nonwoven fabric of the present invention is mainly by three-layer structure, and the middle layer is acrylic acid water-absorbing resin, which is also common high-efficiency water-absorbing polymer, and acrylic acid water-absorbing resin is clamped by nonwoven fabrics, and water absorption in the middle is obtained, the nonwoven fabrics of both sides are hydrophobic.Wherein nonwoven fabrics is through the grafting of N-vinyl formamide, forms polyvinylamine, and nonwoven fabrics is modified so that the nonwoven surface has amino, and propionic acid water-absorbing resin then adds 1,2-epoxy-3-(propylene radical oxygen base) propane in preparation process, it can be copolymerized with acrylic acid and acrylic acid amide, has brought epoxy group into simultaneously, so that the water-absorbing resin surface has epoxy group.When preparing nonwoven fabrics, trimethyl aluminum DMF solution is smeared, mainly plays the effect of a catalyst, so that epoxy group can react with amino, thereby nonwoven fabrics and water-absorbing resin can produce chemical bond, thereby having better peel strength.

[0086] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A water-absorbent nonwoven fabric, characterized in that: The invention comprises two modified non-woven fabric layers and a water-absorbing layer located between the two modified non-woven fabric layers; The modified nonwoven fabric layer is prepared by the following method: Step A: Take N-vinylformamide and dissolve it in deionized water to obtain solution A; Step B: dissolving benzophenone in acetone to obtain solution B; Step C: uniformly mixing solution A and solution B on an ultrasonic instrument to obtain a modified solution; Step D: soaking the PP non-woven fabric in the modified solution and reacting under ultraviolet light; Step E: After the reaction is completed, the non-woven fabric is taken out, washed with water, ethanol, and acetone in sequence, and finally dried in an oven at 60°C to obtain the modified non-woven fabric; The water absorbing layer is prepared by the following method: Step a: neutralizing acrylic acid with sodium hydroxide, and then mixing with acrylic acid amide, 1,2-epoxy-3-(propyleneoxy)propane, and deionized water; Step b: adding a crosslinking agent, stirring and heating continuously, and then adding an initiator to react to obtain a water-absorbing gel; The mass ratio of N-vinylformamide to deionized water in step A is 1:10; The mass ratio of benzophenone to acetone in step B is 1:200; In step C, the mass ratio of solution A to solution B is 1:1; In step D, the UV lamp irradiation time is 3 to 10 minutes; In step a, the mass ratio of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane is 8:4:1:37; In the step b, the amount of the crosslinking agent is 0.1 wt% of the total mass of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane, and the amount of the initiator is 0.3 wt% of the total mass of acrylic acid, acrylic acid amide, and 1,2-epoxy-3-(propyleneoxy)propane.

2. The water-absorbent nonwoven fabric according to claim 1, wherein: The cross-linking agent in step b is N,N-methylenebisacrylamide; The initiator is potassium persulfate.

3. The water-absorbent nonwoven fabric according to claim 1, characterized in that: In the step a, sodium hydroxide neutralizes acrylic acid, and the neutralization is stopped when the neutralization degree reaches 65%.

4. The water-absorbent nonwoven fabric according to claim 1, wherein: In the step b, the reaction temperature is 55-65°C.

5. The water-absorbent nonwoven fabric according to claim 1, characterized in that: The non-woven fabric preparation method is: Apply 0.5% by mass of trimethylaluminum DMF solution on either side of the modified non-woven fabric; The side of one layer of modified non-woven fabric coated with trimethylaluminum DMF solution is coated with a water-absorbing gel, and then covered with another layer of modified non-woven fabric, and the side coated with trimethylaluminum DMF solution is in contact with the above-mentioned water-absorbing gel, and pressed at 60-80°C to form a multi-layer composite water-absorbing non-woven fabric.

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