阅读说明：本技术 一种纸尿裤用无纺布材料的制备方法 (Preparation method of non-woven fabric material for paper diapers ) 是由 马雪侠 于 2020-07-02 设计创作，主要内容包括：本发明公开了一种纸尿裤用无纺布材料的制备方法；涉及纸尿裤制备技术领域,包括以下步骤：(1)得到中间体；(2)将聚丙烯树脂、硬脂酸盐、纳米填料添加到高速搅拌机中进行混合,然后在添加到挤出机中进行挤出造粒,得到预备母粒；(3)得到接枝预聚体；(4)得无纺布材料；本发明提供了一种纸尿裤用无纺布材料的制备方法,本发明制备的纸尿裤用无纺布材料具有优异的吸水速率和吸水容量,相较于常规的无纺布材料的较低吸水性,大幅度的得到改善,从而,能够更好的防止纸尿裤的漏尿现象的出现。(The invention discloses a preparation method of a non-woven fabric material for paper diapers; relates to the technical field of paper diaper preparation, and comprises the following steps: (1) obtaining an intermediate; (2) adding polypropylene resin, stearate and nano filler into a high-speed stirrer for mixing, and then adding the mixture into an extruder for extrusion granulation to obtain prepared master batches; (3) obtaining grafting prepolymer; (4) obtaining a non-woven fabric material; the non-woven fabric material for the paper diaper prepared by the invention has excellent water absorption rate and water absorption capacity, and is greatly improved compared with the lower water absorption of the conventional non-woven fabric material, so that the urine leakage phenomenon of the paper diaper can be better prevented.)

1. A preparation method of a non-woven fabric material for paper diapers is characterized by comprising the following steps:

(1) adding methyl cellulose into a reaction kettle, then adding deionized water, heating to 50-55 ℃, preserving heat, stirring for 30min, then adding maleic anhydride and graphene, continuing stirring for 10-15min, then adding a catalyst, stirring for reaction for 2 h, then sequentially washing with acetone and clear water, and drying to obtain an intermediate;

(2) adding polypropylene resin, stearate and nano filler into a high-speed stirrer for mixing, and then adding the mixture into an extruder for extrusion granulation to obtain prepared master batches;

(3) mixing the obtained intermediate with deionized water, adding the mixture into a reaction kettle, heating the mixture to 50-60 ℃, keeping the temperature and stirring the mixture for 1 hour, then dropwise adding an ammonium persulfate solution while stirring, adding acrylic acid after the dropwise adding is finished, stirring the mixture for 15-20min, then adjusting the pH of a reaction system to 8-9, placing the reaction system under an ultraviolet lamp to irradiate the reaction system for 5-6 hours, standing the reaction system for 2 hours, then filtering the reaction system, washing the reaction system with clear water, and drying the reaction system to obtain a grafting prepolymer;

(4) and adding the grafting prepolymer and the prepared master batch into a high-speed mixer for uniform mixing, then adding into an extruder for melt extrusion, and then adding into a spinning machine for spinning, laying a mesh line, and hot-pressing and coiling to obtain the non-woven fabric material.

2. The method for preparing a nonwoven fabric material for diapers according to claim 1, characterized in that: the mixing mass ratio of the methyl cellulose to the deionized water is 1: 5-6.

3. The method for preparing a nonwoven fabric material for diapers according to claim 2, characterized in that: the mass ratio of the maleic anhydride to the graphene to the methyl cellulose is 1-2:0.3-0.5: 35-40.

4. The method for preparing a nonwoven fabric material for diapers according to claim 3, characterized in that: the catalyst is pyridine;

the mass ratio of the addition amount of the catalyst to the maleic anhydride is 1: 4-5.

5. The method for preparing the non-woven fabric material for the paper diaper according to claim 1, which is characterized in that: the mass ratio of the polypropylene resin to the stearate to the nano filler is 85-90:5-7: 6-8.

6. The method for producing a nonwoven fabric material for diapers according to claim 1 or 5, characterized in that: the stearate is sodium stearate;

the nano filler is nano diatomite.

7. The method for preparing a nonwoven fabric material for diapers according to claim 1, characterized in that: the mixing ratio of the intermediate to deionized water is 45-60 g: 400 mL;

the ratio of the ammonium sulfate solution to the intermediate is 45-60:40 mL;

the mass ratio of the acrylic acid to the intermediate is 15-16: 3.

8. The method for preparing a nonwoven fabric material for diapers according to claim 1, characterized in that: the power of the ultraviolet lamp is 1000W.

9. The method for preparing a nonwoven fabric material for diapers according to claim 1, characterized in that: the mass ratio of the grafting prepolymer to the prepared master batch is 1: 10-12.

Technical Field

The invention belongs to the technical field of paper diapers, and particularly relates to a preparation method of a non-woven fabric material for the paper diapers.

Background

The non-woven fabric has the characteristics of moisture resistance, air permeability, flexibility, light weight, no combustion supporting, easy decomposition, no toxicity or irritation, rich color, low price, recycling and the like. For example, the polypropylene (pp material) granules are mostly adopted as raw materials and are produced by a continuous one-step method of high-temperature melting, spinning, laying a line and hot-pressing coiling.

The disposable diaper is a disposable diaper, which is manufactured by processing non-woven fabrics, and comprises a diaper mode which is special for infants and a diaper mode which is special for adults, in recent years, the using amount of the diaper is extremely increased, but along with the increase of the market on the diaper, the requirements on the quality and the performance of the diaper are continuously improved, however, the core layer of the existing diaper absorbs too much urine, urine leakage occurs after saturation, the water absorption of the non-woven fabric material of the diaper is poor, and therefore, the water absorption performance of the non-woven fabric is improved, and the urine absorption saturation of the diaper can be further improved.

Disclosure of Invention

The invention aims to provide a preparation method of a non-woven fabric material for paper diapers, which aims to overcome the defects in the prior art.

The technical scheme adopted by the invention is as follows:

a preparation method of a non-woven fabric material for paper diapers comprises the following steps:

(1) adding methyl cellulose into a reaction kettle, then adding deionized water, heating to 50-55 ℃, preserving heat, stirring for 30min, then adding maleic anhydride and graphene, continuing stirring for 10-15min, then adding a catalyst, stirring for reaction for 2 h, then sequentially washing with acetone and clear water, and drying to obtain an intermediate;

(2) adding polypropylene resin, stearate and nano filler into a high-speed stirrer for mixing, and then adding the mixture into an extruder for extrusion granulation to obtain prepared master batches;

(3) mixing the obtained intermediate with deionized water, adding the mixture into a reaction kettle, heating the mixture to 50-60 ℃, keeping the temperature and stirring the mixture for 1 hour, then dropwise adding an ammonium persulfate solution while stirring, adding acrylic acid after the dropwise adding is finished, stirring the mixture for 15-20min, then adjusting the pH of a reaction system to 8-9, placing the reaction system under an ultraviolet lamp to irradiate the reaction system for 5-6 hours, standing the reaction system for 2 hours, then filtering the reaction system, washing the reaction system with clear water, and drying the reaction system to obtain a grafting prepolymer;

(4) and adding the grafting prepolymer and the prepared master batch into a high-speed mixer for uniform mixing, then adding into an extruder for melt extrusion, and then adding into a spinning machine for spinning, laying a mesh line, and hot-pressing and coiling to obtain the non-woven fabric material.

The mixing mass ratio of the methyl cellulose to the deionized water is 1: 5-6.

The mass ratio of the maleic anhydride to the graphene to the methyl cellulose is 1-2:0.3-0.5: 35-40.

The catalyst is pyridine;

the mass ratio of the addition amount of the catalyst to the maleic anhydride is 1: 4-5.

The mass ratio of the polypropylene resin to the stearate to the nano filler is 85-90:5-7: 6-8.

The stearate is sodium stearate;

the nano filler is nano diatomite;

the nano diatomite can be pretreated:

uniformly dispersing nano diatomite into an itaconic acid solution with the mass fraction of 1.5%, wherein the ratio of the nano diatomite to the itaconic acid solution is 75 g: 350mL, stirring at the rotating speed of 1500r/min for 1 hour, then adjusting the pH of the reaction system to 10.5, then adjusting the temperature to 80 ℃, keeping the temperature for 40min, then adding ethanol with the mass 2 times that of the nano kieselguhr, stirring uniformly, then adding tetraethoxysilane, wherein the mass ratio of the tetraethoxysilane to the nano kieselguhr is 20:1, continuing stirring for reaction for 2 hours, then carrying out suction filtration, washing and drying to constant weight.

The mixing ratio of the intermediate to deionized water is 45-60 g: 400 mL;

the ratio of the ammonium sulfate solution to the intermediate is 45-60:40 mL;

the mass fraction of the ammonium persulfate solution is 5 percent;

the mass ratio of the acrylic acid to the intermediate is 15-16: 3.

The power of the ultraviolet lamp is 1000W.

The mass ratio of the grafting prepolymer to the prepared master batch is 1: 10-12.

Cellulose is a polyhydroxy compound, contains more capillary structures, has large surface area and high initial water absorption speed, but the water absorption capacity of the conventional cellulose is lower, so the invention modifies the cellulose, participates in the polymerization reaction of acrylic acid monomers to prepare a grafting prepolymer, not only hydrophilic groups are further increased, but also the water absorption capacity is greatly improved, particularly the double combination of physical adsorption and chemical adsorption is shown, the physical adsorption is shown in that the adsorption is realized through the capillary action and the diffusion action, the chemical adsorption is shown in that the adsorption process is realized through ionic groups generated by dissociation, the ionic groups generated by dissociation enable anions to be fixed on a polymer framework, cations can freely move, the number of anions on a polymer chain is continuously increased along with the continuous dissociation of the hydrophilic groups, the electrostatic repulsion between anions is increased, so that the prepolymer network is continuously expanded, and meanwhile, in order to keep the inside electric neutrality of the prepolymer, cations can only stay inside the secondary network, and along with the continuous increase of the concentration of the cations, the inside and outside osmotic pressure difference of the grids is generated, so that a large amount of water is further infiltrated, and further, the water absorption capacity of the water absorption device is greatly improved until the final water absorption balance is reached.

Has the advantages that:

the non-woven fabric material for the paper diaper prepared by the invention has excellent water absorption rate and water absorption capacity, and is greatly improved compared with the lower water absorption of the conventional non-woven fabric material, so that the urine leakage phenomenon of the paper diaper can be better prevented.

Drawings

FIG. 1 is a FTIR spectrum of a grafting precursor.

FIG. 2 is a scanning electron microscope image of a grafting precursor.

Detailed Description

A preparation method of a non-woven fabric material for paper diapers comprises the following steps:

(1) adding methyl cellulose into a reaction kettle, then adding deionized water, heating to 50-55 ℃, preserving heat, stirring for 30min, then adding maleic anhydride and graphene, continuing stirring for 10-15min, then adding a catalyst, stirring for reaction for 2 h, then sequentially washing with acetone and clear water, and drying to obtain an intermediate;

methyl cellulose:

the appearance is gray fiber to powder rice;

the gel temperature (2% aqueous solution) is 50-55 ℃;

the content of methoxyl is 26 to 33 percent;

water insoluble matter is less than or equal to 2.0 percent;

degree of Substitution (DS) 1.3-2.0;

the water content is less than or equal to 5.0 percent;

viscosity (20 ℃, 2% aqueous solution) is 15-4000 mPa & s;

maleic anhydride:

chemical formula C₄H₂O₃

The molar mass is 98.06 g/mol;

white crystals with sour appearance;

density 1.48 g/cm _³ ；

Melting point 52.8 ℃ (326K);

boiling point 202 ℃ (475K);

solubility (water) 40 g/100 ml;

(2) adding polypropylene resin, stearate and nano filler into a high-speed stirrer for mixing, and then adding the mixture into an extruder for extrusion granulation to obtain prepared master batches;

(3) mixing the obtained intermediate with deionized water, adding the mixture into a reaction kettle, heating the mixture to 50-60 ℃, keeping the temperature and stirring the mixture for 1 hour, then dropwise adding an ammonium persulfate solution while stirring, adding acrylic acid after the dropwise adding is finished, stirring the mixture for 15-20min, then adjusting the pH of a reaction system to 8-9, placing the reaction system under an ultraviolet lamp to irradiate the reaction system for 5-6 hours, standing the reaction system for 2 hours, then filtering the reaction system, washing the reaction system with clear water, and drying the reaction system to obtain a grafting prepolymer;

(4) and adding the grafting prepolymer and the prepared master batch into a high-speed mixer for uniform mixing, then adding into an extruder for melt extrusion, and then adding into a spinning machine for spinning, laying a mesh line, and hot-pressing and coiling to obtain the non-woven fabric material.

The mixing mass ratio of the methyl cellulose to the deionized water is 1: 5-6.

The mass ratio of the maleic anhydride to the graphene to the methyl cellulose is 1-2:0.3-0.5: 35-40.

The catalyst is pyridine;

the mass ratio of the addition amount of the catalyst to the maleic anhydride is 1: 4-5.

The mass ratio of the polypropylene resin to the stearate to the nano filler is 85-90:5-7: 6-8.

The stearate is sodium stearate;

the nano filler is nano diatomite;

the nano diatomite can be pretreated:

uniformly dispersing nano diatomite into an itaconic acid solution with the mass fraction of 1.5%, wherein the ratio of the nano diatomite to the itaconic acid solution is 75 g: 350mL, stirring at the rotating speed of 1500r/min for 1 hour, then adjusting the pH of the reaction system to 10.5, then adjusting the temperature to 80 ℃, keeping the temperature for 40min, then adding ethanol with the mass 2 times that of the nano kieselguhr, stirring uniformly, then adding tetraethoxysilane, wherein the mass ratio of the tetraethoxysilane to the nano kieselguhr is 20:1, continuing stirring for reaction for 2 hours, then carrying out suction filtration, washing and drying to constant weight.

The mixing ratio of the intermediate to deionized water is 45-60 g: 400 mL;

the ratio of the ammonium sulfate solution to the intermediate is 45-60:40 mL;

the mass fraction of the ammonium persulfate solution is 5 percent;

the mass ratio of the acrylic acid to the intermediate is 15-16: 3.

The power of the ultraviolet lamp is 1000W.

The mass ratio of the grafting prepolymer to the prepared master batch is 1: 10-12.

The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.