CN116531183B - 3D composite core body of sanitary article and preparation method thereof - Google Patents

Abstract

The application relates to the field of sanitary products, and particularly discloses a 3D composite core of a sanitary product and a preparation method thereof, wherein the composite core comprises an upper layer of non-woven fabric, a lower layer of non-woven fabric and super-absorbent fibers printed between the non-woven fabric layers through 3D printing, the super-absorbent fibers are distributed in the middle of the composite core, the distribution of the super-absorbent fibers on two sides is less, and the super-absorbent fibers are prepared from the following raw materials: polyacrylonitrile fibers and hydrophobic gel particles; the hydrophobic gel particles comprise a coating and a core material, wherein the coating is prepared from poly (hydroxyethyl) methyl acrylate, palm fat powder and sodium bicarbonate, and the core material is a mixture of isophorone diisocyanate, 2-perfluorooctyl ethanol and dibutyltin dilaurate; the preparation method comprises the following steps: and mixing polyacrylonitrile fibers with the hydrophobic gel particles, and printing the mixture between the upper layer of non-woven fabrics and the lower layer of non-woven fabrics through 3D to form super-absorbent fibers, wherein the super-absorbent fibers are distributed in the middle of the composite core body, and the distribution of the super-absorbent fibers on two sides is less. The application has the characteristic of improving the reverse osmosis resistance of the composite core body.

Description

3D composite core body of sanitary article and preparation method thereof

Technical Field

The application relates to the technical field of sanitary products, in particular to a 3D composite core body of a sanitary product and a preparation method thereof.

Background

Disposable diapers are convenient to carry, unnecessary to clean and convenient to replace, and are popular with consumers in recent years. The key technology of the paper diaper is a core body. With the development of technology and materials, the development of diaper cores is going toward narrower, thinner and lighter.

The core of paper diapers has undergone a change from a second generation core to a second generation conventional core. The first generation paper diaper core is a wood pulp core, mainly a mixture of fluff pulp and high polymer water absorbing materials, mainly uses wood pulp fibers to dredge urine into the absorption core, and uses strong water locking performance of the high polymer materials to lock the urine, but the core layer has a loose structure, is easy to block, has limited absorption capacity, reduces the proportion of wood pulp when the absorption capacity is required to be improved, increases the usage amount of water absorbing resin, and causes the paper diaper to block and form faults after absorbing water;

the second generation paper diaper core body water absorption layer mainly comprises dust-free paper, non-woven fabrics and macromolecule water absorption resin, each layer of material of the core body is made of hot melt adhesive, the core body is integrally expanded after water absorption, the core body is flat and does not stick together, the original shape can be kept after liquid absorption, but the water absorption resin is expanded into harder hydrogel after water absorption, the whole air permeability is reduced, the limitations exist on the diversion, the water absorption speed and the strength of the core body, the granular water absorption resin is not easy to mix uniformly and easily slide, the strength and the performance of the non-woven material are influenced to a certain extent, the absorption is easy to be uneven, and the reverse osmosis is higher.

Therefore, the composite core body with good reverse osmosis resistance is of great significance to the current sanitary articles such as paper diapers and the like.

Disclosure of Invention

In order to improve the reverse osmosis resistance of the composite core, the application provides a 3D composite core of a sanitary article and a preparation method thereof.

In a first aspect, the present application provides a 3D composite core of a sanitary article, which adopts the following technical scheme: the utility model provides a 3D composite core of health supplies, includes upper and lower two-layer non-woven fabrics and prints the super absorbent fiber between the non-woven fabrics layer through 3D, super absorbent fiber distributes in the middle of composite core more, and both sides distribute fewly, super absorbent fiber is made by the raw materials including following parts by weight: 50-70 parts of polyacrylonitrile fiber and 8-15 parts of hydrophobic gel particles;

the hydrophobic gel particles comprise a coating and a core material, wherein the coating is poly (hydroxyethyl) methyl acrylate, palm fat powder and sodium bicarbonate, and the core material is a mixture of isophorone diisocyanate, 2-perfluorooctyl ethanol and dibutyltin dilaurate.

By adopting the technical scheme, the super absorbent fibers printed in a 3D mode are arranged between the composite core layers, the super absorbent fibers are selectively distributed in the core through 3D printing, the distribution is more in the middle and less in the two sides, the core absorbs liquid to form a special shape, the super absorbent fibers absorb water and expand to form soft fibrous hydrogel, certain pores are formed among the fibers, the air permeability is good, and the comfort of infants is improved.

The super-absorbent fiber takes the polyacrylonitrile fiber as a main body, the surface of the super-absorbent fiber is provided with hydrophilic groups such as-CONH 2, -COOH and the like, and the hydrophilic groups and water molecules form an associated hydrogen bond, so that the water molecules remain on the fiber, have excellent water absorption multiplying power and salt water absorption multiplying power under the action of chemical bonds, and are matched with the addition of a porous organic polymer, and the water absorption and water retention capacity of the super-absorbent fiber is further improved by utilizing a micropore pore structure and absorbing and transmitting water through capillary effect, and the air permeability of the composite core is also facilitated to be improved;

in addition, hydrophobic gel particles are added in the application, the coating of the hydrophobic gel particles is a mixture of polyhydroxyethyl methyl acrylate, palm fat powder and sodium bicarbonate, the core material is isophorone diisocyanate, 2-perfluorooctyl ethanol and dibutyltin dilaurate, the coating realizes the coating of the core material, the polyhydroxyethyl methyl acrylate swells when water enters urine in the composite core body, the swelling of the composite core body becomes larger and is broken under the condition of being pressed, and the coating is broken by being matched with the dissolution of the sodium bicarbonate, so that the isophorone diisocyanate in the core material is taken as an intermediate, one end reacts with 2-perfluorooctyl ethanol under the catalysis of dibutyltin dilaurate, and the other end reacts with carboxyl in polyacrylonitrile fiber to realize the hydrophobic modification, thereby improving the hydrophobic property of the composite core body, preventing liquid from backflushing under the condition of being pressed, improving the reverse osmosis resistance of the composite core body, and the composite core body prepared in the application has good air permeability and excellent reverse osmosis resistance.

Optionally, the mass ratio of the coating of the hydrophobic gel particle to the core material is 1: (0.8-1);

the adding mass ratio of the polyhydroxyethyl methyl acrylate to the palm fat powder to the sodium bicarbonate is 1: (0.5-0.6): (0.1-0.2);

the addition mass ratio of isophorone diisocyanate to 2-perfluorooctyl ethanol to dibutyltin dilaurate is 1: (0.6-0.8): (0.05-0.1).

Through adopting above-mentioned technical scheme, through the mass ratio control to capsule and core, realize the better cladding to the core, can realize the protection of certain stage moreover, can damage when absorbing liquid more and realize hydrophobic modification, prevent reverse osmosis, can not influence earlier stage imbibition efficiency.

Optionally, the hydrophobic gel particles are prepared by the following method:

mixing isophorone diisocyanate, 2-perfluorooctyl ethanol and dibutyltin dilaurate, granulating, and drying to obtain a core material;

and then mixing the polyhydroxyethyl methyl acrylate, palm fat powder and sodium bicarbonate, spraying the mixture on the surface of the core material, and drying to obtain the hydrophobic gel particles.

Optionally, the polyacrylonitrile fiber comprises the following raw materials in parts by weight:

50-65 parts of acrylonitrile, 46-58 parts of methacrylic acid, 35-45 parts of N-light methyl acrylamide, 25-35 parts of vinyl neodecanoate, 15-25 parts of dodecafluoroheptyl methacrylate, 10-18 parts of hydroxy fatty acid and 2-5 parts of dodecyl mercaptan.

By adopting the technical scheme, the polyacrylonitrile fiber is based on acrylonitrile, methacrylic acid and N-light methyl acrylamide, new vinyl decanoate is added on the basis, one end of the new vinyl decanoate is tertiary carbonic acid, the other end of the new vinyl decanoate is vinyl unsaturated group, copolymerization of polyacrylonitrile is realized, tertiary carbonic acid groups are introduced, the outer side of the super absorbent fiber is grafted with partial hydrophobic groups due to the steric hindrance effect of the new vinyl decanoate, the super absorbent fiber prepared by the new vinyl decanoate fiber has excellent water absorption performance and simultaneously improves the reverse osmosis resistance, and hydroxyl fatty acid and dodecafluoroheptyl methacrylate comonomer is introduced to further introduce hydroxyl functional groups and the like, so that the water absorption performance of the new vinyl decanoate is improved, and the crosslinking copolymerization degree of the new vinyl decanoate can be controlled, so that the prepared super absorbent fiber has excellent water absorption performance and simultaneously has excellent reverse osmosis resistance.

Optionally, the hydroxy fatty acid is at least one of 15-hydroxy pentadecarbonic acid, 17-hydroxy heptadecarbonic acid, 20-hydroxy eicosanoic acid, 21-hydroxy di-undecanoic acid and 22-hydroxy docosanoic acid.

Optionally, the polyacrylonitrile fiber is prepared by the following method:

mixing acrylonitrile, methacrylic acid and N-light methyl acrylamide, adding the mixture into water, adding an initiator, heating to 55-70 ℃ for reaction for 1-1.5 hours, adding hydroxy fatty acid, adding dodecafluoroheptyl methacrylate after reaction for 30-40min, adding vinyl neodecanoate after reaction for 20-30min, reacting for 40-50min, adding dodecyl mercaptan, reacting for 10-20min, cooling to obtain a polyacrylonitrile fiber stock solution, and then obtaining the polyacrylonitrile fiber through wet spinning.

By adopting the technical scheme, the polyacrylonitrile is polymerized firstly, then hydroxy fatty acid is added, hydroxy is introduced, then dodecafluoroheptyl methacrylate and vinyl neodecanoate are sequentially added, and dodecyl mercaptan is added after a small amount of hydrophobic groups are introduced, so that the polymerization inhibition effect is achieved, the finally obtained fiber macromolecules are mainly based on the polyacrylonitrile, a small amount of hydroxy groups are arranged in a main chain, the hydrophobic groups are mainly distributed on side chains, and the liquid absorption performance and the reverse osmosis resistance of the obtained super absorbent fiber are better.

Optionally, 3-5 parts by weight of animal and plant protein foaming agent is added before adding the vinyl neodecanoate, the temperature is reduced to 40-45 ℃ for reaction for 20-30min, and then the temperature is increased to 55-70 ℃ for adding the vinyl neodecanoate.

By adopting the technical scheme, when the polyacrylonitrile fiber is prepared, the animal and plant protein foaming agent is introduced to make the fiber macromolecules fluffy, and partial bubbles are introduced, so that the liquid absorption performance and the air permeability are improved more favorably.

Optionally, the polyacrylonitrile fiber is modified and then subjected to 3D printing, and the modification method comprises the following steps: hydrolyzing polyacrylonitrile fiber in triethanolamine solvent, and then thermally crosslinking at 110-120 ℃ for 25-35min to obtain modified polyacrylonitrile fiber.

By adopting the technical scheme, the polypropylene fiber is hydrolyzed in the alkaline organic solvent, so that the surface layer of the polyacrylonitrile fiber is hydrolyzed, the polyacrylonitrile fiber is modified, and the water absorption rate and the salt water absorption rate of the polyacrylonitrile fiber are further improved.

Optionally, when the hydrophobic gel particles are prepared, isophorone diisocyanate is added, and meanwhile, methyl parahydroxybenzoate is also added, wherein the mass ratio of the methyl parahydroxybenzoate to the isophorone diisocyanate is 1: (6-8).

By adopting the technical scheme, when the methyl parahydroxybenzoate is added into the core material, the methyl parahydroxybenzoate and the hydroxy fatty acid in the polyacrylonitrile fiber form an ester mixture, so that the hydrophobic property of the polyacrylonitrile fiber is further improved, and compared with polyhydroxy benzoic acid such as dihydroxybenzoic acid or trihydroxybenzoic acid, the monohydroxybenzoic acid is selected, the crosslinking density is lower, and the water absorption capacity of the polyacrylonitrile fiber is prevented from being reduced due to the improvement of the crosslinking density.

In a second aspect, the application provides a method for preparing a 3D composite core of a sanitary article, which adopts the following technical scheme:

a preparation method of a 3D composite core body of a sanitary article comprises the following steps:

and mixing polyacrylonitrile fibers with the hydrophobic gel particles, and printing the mixture between the upper layer of non-woven fabrics and the lower layer of non-woven fabrics through 3D to form super-absorbent fibers, wherein the super-absorbent fibers are distributed in the middle of the composite core body, and the distribution of the super-absorbent fibers on two sides is less.

In summary, the application has the following beneficial effects:

1. the super water-absorbing fiber takes the polyacrylonitrile fiber as a main body, the surface of the super water-absorbing fiber is provided with hydrophilic groups such as-CONH 2, -COOH and the like, and the hydrophilic groups and water molecules form an associated hydrogen bond, so that the water molecules remain on the fiber, and the super water-absorbing fiber has excellent water absorption rate and salt water absorption rate under the action of chemical bonds; according to the application, hydrophobic gel particles are added, coated polyhydroxyethyl methyl acrylate swells when water, when urine enters the composite core body, the swelling becomes larger and is broken under the condition of being pressed, and then the composite core body is matched with the dissolution of sodium bicarbonate, so that the coating is broken, isophorone diisocyanate in the core material is used as an intermediate, one end reacts with 2-perfluorooctyl alcohol under the catalysis of dibutyltin dilaurate, and the other end reacts with carboxyl in polyacrylonitrile fiber to realize the hydrophobic modification of the composite core body, so that the hydrophobic property of the composite core body is improved, the liquid is prevented from being back-permeated under the condition of being pressed, the reverse osmosis resistance of the composite core body is improved, and the composite core body prepared in the application has good air permeability and excellent reverse osmosis resistance at the same time;

2. according to the application, the polyacrylonitrile fiber takes acrylonitrile, methacrylic acid and N-light methyl acrylamide as references, new vinyl decanoate is added on the basis, one end of the new vinyl decanoate is tertiary carbonic acid, the other end of the new vinyl decanoate is vinyl unsaturated group, copolymerization of polyacrylonitrile is realized, tertiary carbonic acid groups are introduced, the steric hindrance effect of the new vinyl decanoate is used for enabling the outer side of the super water-absorbent fiber to be grafted with partial hydrophobic groups, the super water-absorbent fiber prepared by the new vinyl decanoate fiber has excellent water-absorbent property and simultaneously improves reverse osmosis resistance, hydroxyl fatty acid and dodecyl methacrylate comonomer are introduced to further introduce hydroxyl functional groups and the like, the water-absorbent property of the new vinyl decanoate is improved, and the crosslinking copolymerization degree of the new vinyl decanoate can be controlled by adding dodecyl mercaptan, so that the prepared super water-absorbent fiber has excellent water-absorbent property and excellent reverse osmosis resistance;

3. when the polyacrylonitrile fiber is prepared, the animal and plant protein foaming agent is introduced to make the fiber macromolecules fluffy, and partial bubbles are introduced, so that the liquid absorption performance and the air permeability are improved more favorably.

Detailed Description

The application is further described in detail below with reference to the following examples, which are specifically described: the following examples, in which no specific conditions are noted, are conducted under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following examples are commercially available from ordinary sources except for the specific descriptions.

The following preparation examples are of hydrophobic gel particles

Preparation example 1

A method for preparing hydrophobic gel particles, comprising the steps of:

isophorone diisocyanate, 2-perfluorooctyl ethanol, dibutyltin dilaurate were reacted according to 1:0.7: mixing the materials according to the mass ratio of 0.08, granulating and drying to obtain a core material;

then, the poly (hydroxyethyl) methyl acrylate and palm fat powder and sodium bicarbonate are mixed according to the following ratio of 1:0.5: mixing the materials according to the mass ratio of 0.1 to obtain coating liquid, and then spraying the coating liquid on the surface of the core material, wherein the mass ratio of the coating liquid to the core material is 1:0.9, drying to obtain hydrophobic gel particles.

Preparation example 2

A method for preparing hydrophobic gel particles, comprising the steps of:

isophorone diisocyanate, 2-perfluorooctyl ethanol, dibutyltin dilaurate were reacted according to 1:0.6: mixing the materials according to a mass ratio of 0.05, granulating and drying to obtain a core material;

then, the poly (hydroxyethyl) methyl acrylate and palm fat powder and sodium bicarbonate are mixed according to the following ratio of 1:0.5: mixing the materials according to the mass ratio of 0.1 to obtain coating liquid, and then spraying the coating liquid on the surface of the core material, wherein the mass ratio of the coating liquid to the core material is 1:0.8, drying to obtain hydrophobic gel particles.

Preparation example 3

A method for preparing hydrophobic gel particles, comprising the steps of:

isophorone diisocyanate, 2-perfluorooctyl ethanol, dibutyltin dilaurate were reacted according to 1:0.8: mixing the materials according to the mass ratio of 0.1, granulating and drying to obtain a core material;

then, the poly (hydroxyethyl) methyl acrylate and palm fat powder and sodium bicarbonate are mixed according to the following ratio of 1:0.6: mixing the materials according to the mass ratio of 0.2 to obtain coating liquid, and then spraying the coating liquid on the surface of the core material, wherein the mass ratio of the coating liquid to the core material is 1:1, drying to obtain hydrophobic gel particles.

Preparation example 4

A preparation method of hydrophobic gel particles is carried out according to the method in preparation example 1, and is characterized in that when the core material is prepared, isophorone diisocyanate is added, and meanwhile, methyl parahydroxybenzoate is also added, and the addition mass ratio of the methyl parahydroxybenzoate to isophorone diisocyanate is 1:7.

preparation example 5

A preparation method of hydrophobic gel particles is carried out according to the method in preparation example 1, and is characterized in that when the core material is prepared, isophorone diisocyanate is added, and meanwhile, methyl parahydroxybenzoate is also added, and the addition mass ratio of the methyl parahydroxybenzoate to isophorone diisocyanate is 1:6.

preparation example 6

A preparation method of hydrophobic gel particles is carried out according to the method in preparation example 1, and is characterized in that when the core material is prepared, isophorone diisocyanate is added, and meanwhile, methyl parahydroxybenzoate is also added, and the addition mass ratio of the methyl parahydroxybenzoate to isophorone diisocyanate is 1:8.

comparative preparation example 1

A preparation method of hydrophobic gel particles is carried out according to the method scheme in preparation example 1, except that the same amount of polyhydroxyethyl methyl acrylate is replaced by palm fat powder in the coating liquid.

Comparative preparation example 2

A preparation method of hydrophobic gel particles is carried out according to the method scheme in preparation example 1, except that sodium bicarbonate is not added into the coating liquid.

Example 1

A preparation method of a 3D composite core body of a sanitary article comprises the following steps:

s1, preparing polyacrylonitrile fibers: mixing 58kg of acrylonitrile, 50kg of methacrylic acid and 40kg of N-light methyl acrylamide to obtain a mixture, then adding the mixture into water, wherein the mass ratio of the mixture to the water is 1:4, adding 4kg of an initiator azodiisobutyronitrile, heating to 60 ℃ for reaction for 70min, then adding 15kg of hydroxy fatty acid, reacting for 35min, adding 20kg of dodecafluoroheptyl methacrylate, reacting for 25min, adding 30kg of vinyl neodecanoate, reacting for 45min, adding 4kg of dodecyl mercaptan, reacting for 15min, cooling to room temperature to obtain a polyacrylonitrile fiber stock solution, and preparing the polyacrylonitrile fiber through wet spinning;

soaking polyacrylonitrile fibers in a triethanolamine solvent for hydrolysis for 20min, and then thermally crosslinking at 115 ℃ for 30min to obtain modified polyacrylonitrile fibers;

wherein, the hydroxy fatty acid is 15-hydroxy pentadecarbonic acid;

s2, mixing 60kg of the modified polyacrylonitrile fibers prepared in the step S1 with 12kg of the hydrophobic gel particles prepared in the preparation example 1, and printing the mixture between an upper layer of non-woven fabric and a lower layer of non-woven fabric through 3D to form super-absorbent fibers, wherein the super-absorbent fibers are distributed in the middle of the composite core body, the distribution of the super-absorbent fibers on two sides is less, and finally the 3D composite core body with the super-absorbent fiber structure, wherein the upper layer and the lower layer of non-woven fabric are non-woven fabrics, and the 3D printing is distributed between the non-woven fabrics.

Example 2

A preparation method of a 3D composite core body of a sanitary article comprises the following steps:

s1, preparing polyacrylonitrile fibers: mixing 50kg of acrylonitrile, 46kg of methacrylic acid and 35kg of N-light methyl acrylamide to obtain a mixture, then adding the mixture into water, wherein the mass ratio of the mixture to the water is 1:3.5, adding 3kg of an initiator azodiisobutyronitrile, heating to 55 ℃ for reaction for 1.5 hours, then adding 10kg of hydroxy fatty acid, reacting for 30 minutes, adding 15kg of dodecafluoroheptyl methacrylate, reacting for 20 minutes, adding 25kg of vinyl neodecanoate, reacting for 40 minutes, adding 2kg of dodecyl mercaptan, reacting for 10 minutes, cooling to room temperature to obtain a polyacrylonitrile fiber stock solution, and then preparing the polyacrylonitrile fiber through wet spinning;

soaking polyacrylonitrile fibers in a triethanolamine solvent for hydrolysis for 15min, and then thermally crosslinking at 110 ℃ for 35min to obtain modified polyacrylonitrile fibers;

wherein, the hydroxy fatty acid is 20-hydroxy eicosanoic acid;

s2, 50kg of the modified polyacrylonitrile fibers prepared in the step S1 are mixed with 8kg of the hydrophobic gel particles prepared in the preparation example 2, then the mixture is printed between the upper layer of non-woven fabrics and the lower layer of non-woven fabrics through 3D printing, so that super-absorbent fibers are formed, the super-absorbent fibers are distributed more in the middle of the composite core body, the distribution on the two sides is less, and finally the 3D composite core body with the super-absorbent fiber structure, wherein the upper layer and the lower layer of non-woven fabrics are the non-woven fabrics, and the 3D printing is distributed between the non-woven fabrics.

Example 3

A preparation method of a 3D composite core body of a sanitary article comprises the following steps:

s1, preparing polyacrylonitrile fibers: mixing 65kg of acrylonitrile, 58kg of methacrylic acid and 45kg of N-light methyl acrylamide to obtain a mixture, then adding the mixture into water, wherein the mass ratio of the mixture to the water is 1:4.5, adding 5kg of an initiator azodiisobutyronitrile, heating to 70 ℃ for reaction for 1h, then adding 18kg of hydroxy fatty acid, reacting for 40min, adding 25kg of dodecafluoroheptyl methacrylate, reacting for 30min, adding 35kg of vinyl neodecanoate, reacting for 50min, adding 5kg of dodecyl mercaptan, reacting for 20min, cooling to room temperature to obtain a polyacrylonitrile fiber stock solution, and then preparing the polyacrylonitrile fiber through wet spinning;

soaking polyacrylonitrile fibers in a triethanolamine solvent for hydrolysis for 30min, and thermally crosslinking at 120 ℃ for 25min to obtain modified polyacrylonitrile fibers;

wherein, the hydroxy fatty acid is 22-hydroxy behenic acid;

s2, mixing 70kg of the modified polyacrylonitrile fibers prepared in the step S1 with 15kg of the hydrophobic gel particles prepared in the preparation example 3, and printing the mixture between an upper layer of non-woven fabric and a lower layer of non-woven fabric through 3D to form super-absorbent fibers, wherein the super-absorbent fibers are distributed in the middle of the composite core body, the distribution of the super-absorbent fibers on two sides is less, and finally the 3D composite core body with the super-absorbent fiber structure, wherein the upper layer and the lower layer of non-woven fabric are non-woven fabrics, and the 3D printing is distributed between the non-woven fabrics.

Example 4

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, except that the polyacrylonitrile fiber prepared in the step S1 is directly subjected to the step S2 after being not modified.

Example 5

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, and is characterized in that 3kg of animal and plant protein foaming agent is added before adding vinyl neodecanoate in the step S1, the temperature is reduced to 40 ℃ for reaction for 30min, then the temperature is increased to 60 ℃ and the vinyl neodecanoate is added for subsequent operation.

Example 6

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, and is characterized in that 5kg of animal and plant protein foaming agent is added before adding vinyl neodecanoate in the step S1, the temperature is reduced to 45 ℃ for reacting for 20min, then the temperature is increased to 60 ℃ and the vinyl neodecanoate is added for subsequent operation.

Examples 7 to 9

A method for preparing a 3D composite core of a sanitary article is carried out according to the method in example 1, except that the hydrophobic gel particles added in the step S2 are hydrophobic gel particles prepared in preparation examples 4 to 6, respectively.

Example 10

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, except that no hydroxy fatty acid is added to the raw material when the polyacrylonitrile fiber is prepared in the step S1.

Example 11

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, except that in the step S1, when the polyacrylonitrile fiber is prepared, the raw material is not added with the dodecafluoroheptyl methacrylate.

Example 12

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, except that when the polyacrylonitrile fiber is prepared in the step S1, no vinyl neodecanoate is added into the raw material.

Example 13

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, except that dodecyl mercaptan is not added in the raw material when the polyacrylonitrile fiber is prepared in the step S1.

Comparative example 1

A preparation method of a 3D composite core of a sanitary article is carried out according to the method in the embodiment 1, except that hydrophobic gel particles are not added in the step S2, and modified polyacrylonitrile fibers are directly printed on non-woven fabrics through 3D.

Comparative examples 2 to 3

A method for preparing a 3D composite core of a sanitary article is carried out according to the method in example 1, except that the hydrophobic gel particles added in step S2 are the hydrophobic gel particles prepared in comparative preparation example 1 and comparative preparation example 2, respectively.

Performance detection

The 3D composite cores prepared in the embodiment and the comparative example are subjected to detection of water absorption rate and rewet amount, wherein the water absorption rate is carried out according to GB/T8939-2008, the rewet amount is carried out according to GB/T28004-2011, and the specific method is as follows:

test solution (i.e., artificial urine) with a concentration of 0.9% was prepared with sodium chloride and distilled water, 100mL (60 mL specified by GB/T28004-2011) of the test solution was added to the 3D composite core sample, and filter paper of known mass was rapidly placed on the sample surface while 2kg of briquette (1.2±0.002kg specified by GB/T28004-2011) was pressed against the filter paper, and after 1min of pressing, the briquette was removed, and the wet weight of the filter paper on the sample surface was weighed. The above procedure was repeated with two additional charges (three equal amounts) (GB/T28004-2011 was performed only once). The rewet amount of the paper diaper sample is characterized by the poor quality before and after the surface filter paper test, and considering that the rewet amount of the first pressurizing test is little and the reverse osmosis amount of the second pressurizing test is increased, the rewet resistance is characterized by the sum of the rewet amounts of the third pressurizing test in the application, and the detection result is shown in the following table 1:

table 1:

as can be seen from the above table, the composite core prepared in the examples of the present application has excellent water absorption rate and lower rewet, and has excellent liquid absorption performance and reverse osmosis resistance.

By combining the test results of example 1 and example 4, it can be seen that the liquid absorption performance of the polyacrylonitrile fiber is greatly improved by the modification compared with the non-modification. Referring to the test results of example 5 and example 6 again, it can be seen that the liquid absorption performance of the final composite core body is further remarkably improved when the animal and plant protein foaming agent is added during the preparation of the polyacrylonitrile fiber, and the reverse osmosis resistance is basically unchanged.

Referring to the test results of examples 1 and 7-9 again, it can be seen that when methyl parahydroxybenzoate is added to the hydrophobic gel particles, it is possible to improve the hydrophobic property due to the action of the methyl parahydroxybenzoate and the hydroxy fatty acid in the polyacrylonitrile fiber, so as to improve the reverse osmosis resistance, and the water absorption rate is not reduced; referring to the test results of example 1 and example 10 again, it can be seen that when the polyacrylonitrile fiber is prepared, the water absorption rate is reduced and the rewet amount is improved, and the liquid absorption performance and the reverse osmosis resistance are both reduced when no hydroxy fatty acid is added into the raw material; and then combining the detection result of the example 11, when the dodecafluoroheptyl methacrylate is not added in the polyacrylonitrile fiber raw material, the liquid absorption rate is slightly reduced, and the reverse osmosis resistance is also reduced; when no vinyl neodecanoate is added in the combination of the embodiment 12, the reverse osmosis resistance is also obviously reduced; in example 13, when dodecyl mercaptan was not added, the liquid-absorbing property was lowered, and it was likely that the liquid-absorbing property was lowered when the crosslinking density was large.

Referring to the detection results in example 1 and comparative example 1 again, it can be seen that the modified polyacrylonitrile fiber is 3D printed directly on the non-woven fabric without adding hydrophobic gel particles during the preparation of the composite core, the rewet amount is higher, the sum of rewet amounts after three times of pressurization is greater than 10g, and the liquid absorption rate is reduced; in combination with the results of comparative examples 2 and 3, it can be seen that the rewet amount was significantly reduced when the coating of the hydrophobic gel particles was not added with poly (hydroxyethyl) methyl acrylate, even when the coating of the hydrophobic gel particles was comparable to that when no hydrophobic gel particles were added, and was lower when the coating of the hydrophobic gel particles was not added with sodium bicarbonate.

The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (7)

1. The utility model provides a 3D composite core of health supplies, includes upper and lower two-layer non-woven fabrics and prints the super absorbent fiber between the non-woven fabrics layer through 3D, its characterized in that, super absorbent fiber distributes in the middle of composite core more, and both sides distribute fewly, super absorbent fiber is made by the raw materials including following parts by weight:

50-70 parts of polyacrylonitrile fiber and 8-15 parts of hydrophobic gel particles;

the hydrophobic gel particles comprise a coating and a core material, wherein the coating is prepared from poly (hydroxyethyl) methyl acrylate, palm fat powder and sodium bicarbonate, and the core material is a mixture of isophorone diisocyanate, 2-perfluorooctyl ethanol and dibutyltin dilaurate; the hydrophobic gel particles are prepared by the following method:

mixing isophorone diisocyanate, 2-perfluorooctyl ethanol and dibutyltin dilaurate, granulating, and drying to obtain a core material;

then mixing the polyhydroxyethyl methyl acrylate, palm fat powder and sodium bicarbonate, spraying the mixture on the surface of a core material, and drying to obtain hydrophobic gel particles;

the polyacrylonitrile fiber comprises the following raw materials in parts by weight:

50-65 parts of acrylonitrile, 46-58 parts of methacrylic acid, 35-45 parts of N-light methyl acrylamide, 25-35 parts of vinyl neodecanoate, 15-25 parts of dodecafluoroheptyl methacrylate, 10-18 parts of hydroxy fatty acid and 2-5 parts of dodecyl mercaptan;

the polyacrylonitrile fiber is prepared by the following method:

mixing acrylonitrile, methacrylic acid and N-light methyl acrylamide, adding the mixture into water, adding an initiator, heating to 55-70 ℃ for reaction for 1-1.5 hours, adding hydroxy fatty acid, adding dodecafluoroheptyl methacrylate after reaction for 30-40min, adding vinyl neodecanoate after reaction for 20-30min, reacting for 40-50min, adding dodecyl mercaptan, reacting for 10-20min, cooling to obtain a polyacrylonitrile fiber stock solution, and then obtaining the polyacrylonitrile fiber through wet spinning.

2. A 3D composite core for a sanitary article according to claim 1, wherein: the mass ratio of the coating to the core material of the hydrophobic gel particle is 1: (0.8-1);

the adding mass ratio of the polyhydroxyethyl methyl acrylate to the palm fat powder to the sodium bicarbonate is 1: (0.5-0.6): (0.1-0.2);

the addition mass ratio of isophorone diisocyanate to 2-perfluorooctyl ethanol to dibutyltin dilaurate is 1: (0.6-0.8): (0.05-0.1).

3. A 3D composite core for a sanitary article according to claim 1, wherein: the hydroxy fatty acid is at least one of 15-hydroxy pentadecarbonic acid, 17-hydroxy heptadecarbonic acid, 20-hydroxy eicosanoic acid, 21-hydroxy di-undecanoic acid and 22-hydroxy docosanoic acid.

4. A 3D composite core for a sanitary article according to claim 3, wherein: when the polyacrylonitrile fiber is prepared, 3-5 parts by weight of animal and plant protein foaming agent is added before adding the vinyl neodecanoate, the temperature is reduced to 40-45 ℃ for reaction for 20-30min, and then the temperature is increased to 55-70 ℃ and the vinyl neodecanoate is added.

5. A 3D composite core for a sanitary article according to claim 3, wherein: the modified polyacrylonitrile fiber is subjected to 3D printing, and the modification method comprises the following steps:

hydrolyzing polyacrylonitrile fiber in triethanolamine solvent, and then thermally crosslinking at 110-120 ℃ for 25-35min to obtain modified polyacrylonitrile fiber.

6. A 3D composite core for a sanitary article according to claim 2, wherein: when the hydrophobic gel particles are prepared, isophorone diisocyanate is added, and methyl parahydroxybenzoate is also added, wherein the mass ratio of the methyl parahydroxybenzoate to the isophorone diisocyanate is 1: (6-8).

7. A method for preparing a 3D composite core for a sanitary article according to any one of claims 1 to 6, wherein: the method comprises the following steps:

and mixing polyacrylonitrile fibers with the hydrophobic gel particles, and printing the mixture between the upper layer of non-woven fabrics and the lower layer of non-woven fabrics through 3D to form super-absorbent fibers, wherein the super-absorbent fibers are distributed in the middle of the composite core body, and the distribution of the super-absorbent fibers on two sides is less.