CN113510613A - White pad for display screen polishing and production method thereof - Google Patents

Abstract

The invention discloses a white pad for polishing a display screen and a production method thereof, wherein the white pad comprises a friction layer on the surface layer and a water absorption layer arranged inside the friction layer; the white pad for polishing the display screen is prepared by the following method: sewing a friction layer around the water absorption layer, and controlling the thickness of the water absorption layer and the friction layer to be 1-5: 1; mixing modified fiber and polyester fiber, then puncturing and rebounding through a high-pressure water needle, dehydrating the fiber after mutually intertwining by using a vacuum water absorption device, sending the fiber into a penetrating type drying cylinder for drying, then detecting cloth, cutting, reeling and sewing to prepare a friction layer, and controlling the weight ratio of the modified fiber to the polyester fiber to be 5: 1; the modified fiber is made by electrostatic spinning, wherein the modified fiber is a high-hydrophobicity fiber, and then forms a friction layer with the polyester fiber, so that the modified fiber is endowed with excellent hydrophobicity and the service life of the modified fiber is prolonged.

Description

White pad for display screen polishing and production method thereof

Technical Field

The invention belongs to the technical field of polishing materials, and particularly relates to a white pad for polishing a display screen and a production method thereof.

Background

Nowadays, as the society pursues higher and higher performance and miniaturization of electronic smart products, the fabrication of integrated circuits requires high integration and multi-layer wiring, which require higher precision flatness of the surface of a semiconductor wafer for integrated circuits. Currently, the technique for global planarization of semiconductor wafers and display screen surfaces is Chemical Mechanical Polishing (CMP). The chemical mechanical polishing is a method of adding slurry containing micro abrasive particles and polishing the surface of a base material to be polished by using a polishing pad, so that the white pad for polishing has higher use requirement and can prevent the service life from being influenced by corrosion when the white pad is contacted with substances such as polishing solution for a long time.

The invention of Chinese patent CN105415168A is a method for preparing a composite polishing pad, comprising the following steps: 1) non-woven fabric pretreatment: a) putting the non-woven fabric into an oven for leveling treatment; b) immersing the flattened non-woven fabric into the glue solution, and taking out the flattened non-woven fabric after complete infiltration to obtain a non-woven fabric substrate; 2) preparing a polymer solution: i) dissolving a macromolecular elastomer in a solvent to prepare a macromolecular elastomer solution; II) adding the polymer particles into the high-molecular elastomer solution to obtain a polymer solution; 3) forming a non-woven fabric into a cushion: soaking a non-woven fabric substrate into a polymer solution; taking out after complete infiltration, scraping off redundant solution on the surface, and immersing in a coagulating bath for coagulation forming; then putting the polishing pad into pure water for rinsing, and finally drying the polishing pad to constant weight to obtain an original polishing pad; 4) and (3) polishing pad forming: and grinding, cutting and gluing the surface of the original polishing pad to obtain a finished polishing pad.

Disclosure of Invention

In order to overcome the technical problems, the invention provides a white pad for polishing a display screen and a production method thereof.

The purpose of the invention can be realized by the following technical scheme:

a white pad for polishing a display screen comprises a friction layer on the surface layer and a water absorption layer arranged inside the friction layer;

the white pad for polishing the display screen is prepared by the following method:

the periphery of the water absorption layer is sewed with a friction layer, and the thickness of the water absorption layer and the friction layer is controlled to be 1-5: 1.

The friction layer is prepared by the following steps:

step S1, adding bleached softwood kraft pulp into a three-neck flask, adding mixed liquor a, stirring at a constant speed of 500r/min at 300-, the dosage of the dilute hydrochloric acid is 1-5% of the weight of the mixed slurry;

step S2, adding octadecylamine into N, N-dimethyl ammonium formate according to the weight ratio of 1: 5, and uniformly stirring for 15min to prepare a solution b; adding the treated nano-cellulose into a conical flask filled with deionized water, heating in a water bath at 45-50 ℃, magnetically stirring for 30min, adding the solution b, uniformly mixing, adjusting the pH value by using a sodium hydroxide aqueous solution with the concentration of 0.1mol/L until the pH value is 7-8, uniformly stirring and reacting for 4h, centrifuging, washing with deionized water and absolute ethyl alcohol for three times respectively to prepare modified nano-cellulose, and performing electrostatic spinning to prepare modified fiber, wherein the weight ratio of the nano-cellulose to the solution b is controlled to be 5: 1;

and step S3, mixing the modified fibers and the polyester fibers, then puncturing and rebounding through a high-pressure water needle, dehydrating the fibers after the fibers are intertwined with each other through a vacuum water absorption device, sending the fibers into a penetrating type drying cylinder drying machine for drying, then detecting cloth, cutting, coiling and sewing to obtain a friction layer, and controlling the weight ratio of the modified fibers to the polyester fibers to be 5: 1.

Step S1, taking bleached softwood kraft pulp as a raw material, adding a mixed solution a to adjust the system to be alkaline, then adding sodium bromide, 2,6, 6-tetramethylpiperidine-nitrogen-oxide and other raw materials to prepare mixed pulp, wherein the mixed pulp contains oxidized nanocellulose, then dropwise adding dilute hydrochloric acid with the mass fraction of 15% to acidify the mixed pulp, and converting the oxidized cellulose from sodium carboxylate into carboxylic acid; in step S2, octadecyl amine is used as a hydrophobic agent, and in order to sufficiently mix the nanocellulose with octadecyl amine, octadecyl amine is added to N, N-dimethyl formiate according to a weight ratio of 1: 5, and then the mixture is uniformly mixed with a dispersion of nanocellulose, an ion complex is formed through electrostatic adsorption of carboxyl groups on oxidized cellulose containing carboxylic acid and amine groups on octadecyl amine, so as to prepare modified nanocellulose, and then electrostatic spinning is performed to prepare modified fibers, wherein the modified fibers are highly hydrophobic fibers, and then a friction layer is formed with polyester fibers, so that the modified fibers are endowed with excellent hydrophobic property, and the service life of the modified fibers is prolonged.

Further, the mixed solution a is formed by mixing sodium carbonate, sodium bicarbonate and deionized water according to the weight ratio of 1: 100.

Further, the water absorbing layer is prepared by the following steps:

step S11, adding span 80 into a four-neck flask filled with cyclohexane, heating in a water bath at 50 ℃, magnetically stirring, introducing nitrogen to discharge air, and stirring at a constant speed for 1h to prepare a solution c for later use; dropwise adding a sodium hydroxide solution with the mass fraction of 15% into acrylic acid, sequentially adding acrylamide and N, N-methylene bisacrylamide after magnetically stirring for 10min, continuously stirring for 10min, dropwise adding a potassium persulfate aqueous solution with the mass fraction of 15% to prepare a solution d, dropwise adding the solution d into the solution c, controlling the dropwise adding time to be 10min, uniformly stirring and reacting for 2h after the dropwise adding is finished, and filtering and drying after the reaction is finished to prepare a filling material;

step S12, adding acrylic acid and acrylamide into deionized water, stirring at a constant speed of 250r/min for 30min at a speed of 150 plus one year, then adding 2-hydroxypropyl acrylate, introducing nitrogen to discharge air, heating to 60 ℃, adding 10% by mass of potassium persulfate aqueous solution, heating to 80 ℃, stirring at a constant speed and reacting for 2h, then cooling and carrying out suction filtration to obtain a polymer, uniformly mixing the polymer and the filler prepared in the step S1, preparing water-absorbing fibers through wet spinning, and weaving the water-absorbing fibers into a water-absorbing layer.

In step S11, cyclohexane is used as a dispersion medium, span 80 is used as a dispersion system to prepare a dispersant solution, and then neutralized acrylic acid and acrylamide are used as monomers, N-methylene bisacrylamide is used as a cross-linking agent, and a potassium persulfate aqueous solution is used as an initiator to prepare a filler, wherein the filler is a high polymer material with a three-dimensional network structure and has high water absorption.

Further, in step S11, the weight ratio of span 80 to cyclohexane is controlled to 1: 1, the weight ratio of acrylic acid, acrylamide, N-methylene bisacrylamide and potassium persulfate aqueous solution is controlled to 1: 0.5: 5: 0.1, the volume ratio of solution d to solution c is controlled to 1: 2, in step S12, the weight ratio of acrylic acid, acrylamide, acrylic acid-2-hydroxypropyl ester and potassium persulfate aqueous solution is controlled to 5: 1: 0.1: 0.02, and the weight ratio of polymer to filler is controlled to 1: 10.

A production method of a white pad for polishing a display screen comprises the following steps:

the periphery of the water absorption layer is sewed with a friction layer, and the thickness of the water absorption layer and the friction layer is controlled to be 1-5: 1.

The invention has the beneficial effects that:

the white pad for polishing the display screen comprises a friction layer on the surface layer and a water absorption layer arranged in the friction layer, wherein in the preparation process of the friction layer, bleached softwood kraft pulp is used as a raw material in step S1, a mixed solution a is added to adjust the system to be alkaline, then mixed slurry is prepared by adding sodium bromide, 2,6, 6-tetramethylpiperidine-nitrogen-oxide and other raw materials, oxidized nano-cellulose is contained in the mixed slurry, and then diluted hydrochloric acid with the mass fraction of 15% is dripped to acidify the mixed slurry, so that the oxidized cellulose is converted into carboxylic acid from sodium carboxylate; in step S2, octadecyl amine is used as a hydrophobic agent, and in order to sufficiently mix the nanocellulose with octadecyl amine, octadecyl amine is added to N, N-dimethyl formiate according to a weight ratio of 1: 5, and then the mixture is uniformly mixed with a dispersion of nanocellulose, an ion complex is formed through electrostatic adsorption of carboxyl groups on oxidized cellulose containing carboxylic acid and amine groups on octadecyl amine, so as to prepare modified nanocellulose, and then electrostatic spinning is performed to prepare modified fibers, wherein the modified fibers are highly hydrophobic fibers, and then a friction layer is formed with polyester fibers, so that the modified fibers are endowed with excellent hydrophobic property, and the service life of the modified fibers is prolonged.

In the preparation process of the water absorbing layer, cyclohexane is used as a dispersion medium, span 80 is used as a dispersion system to prepare a dispersant solution, then neutralized acrylic acid and acrylamide are used as monomers, N, N-methylene bisacrylamide is used as a cross-linking agent, and a potassium persulfate aqueous solution is used as an initiator to prepare a filler, wherein the filler is a high polymer material with a three-dimensional network structure and has high water absorption, and then the raw materials such as acrylic acid and acrylamide are mixed and added into the filler to spin the water absorbing fiber, so that substances such as polishing solution can be absorbed to a high degree during use, and the polishing of a display screen and the like is facilitated.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 of the 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.

Example 1

A white pad for polishing a display screen comprises a friction layer on the surface layer and a water absorption layer arranged inside the friction layer;

the white pad for polishing the display screen is prepared by the following method:

the periphery of the water absorption layer is sewed with a friction layer, and the thickness of the water absorption layer and the friction layer is controlled to be 1: 1.

The friction layer is prepared by the following steps:

step S1, adding bleached softwood kraft pulp into a three-neck flask, adding mixed liquor a, stirring at a constant speed of 300r/min while dropwise adding, controlling the dropwise adding time to be 10min, sequentially adding sodium bromide and 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide after completely adding, magnetically stirring for 30min, then adding sodium hypochlorite and deionized water, stirring at a constant speed and reacting for 4h to obtain mixed pulp, dropwise adding dilute hydrochloric acid with a mass fraction of 15%, stirring for 30min, washing with deionized water to be neutral, performing ultrasonic treatment to obtain treated nano-cellulose, controlling the dosage ratio of the bleached softwood kraft pulp to the mixed liquor a, sodium bromide, 2,6, 6-tetramethylpiperidine-nitrogen-oxide, sodium chlorate and deionized water to be 1 g: 100 mL: 0.1 g: 0.01 g: 0.1 g: 500mL, the dosage of the dilute hydrochloric acid is 1 percent of the weight of the mixed slurry;

step S2, adding octadecylamine into N, N-dimethyl ammonium formate according to the weight ratio of 1: 5, and uniformly stirring for 15min to prepare a solution b; adding the treated nano-cellulose into a conical flask filled with deionized water, heating in a water bath at 45 ℃, magnetically stirring for 30min, adding the solution b, uniformly mixing, adjusting the pH value with a sodium hydroxide aqueous solution with the concentration of 0.1mol/L until the pH value is 8, uniformly stirring, reacting for 4h, centrifuging, washing with deionized water and absolute ethyl alcohol for three times respectively to prepare modified nano-cellulose, carrying out electrostatic spinning to prepare modified fiber, and controlling the weight ratio of the nano-cellulose to the solution b to be 5: 1;

and step S3, mixing the modified fibers and the polyester fibers, then puncturing and rebounding through a high-pressure water needle, dehydrating the fibers after the fibers are intertwined with each other through a vacuum water absorption device, sending the fibers into a penetrating type drying cylinder drying machine for drying, then detecting cloth, cutting, coiling and sewing to obtain a friction layer, and controlling the weight ratio of the modified fibers to the polyester fibers to be 5: 1.

The mixed liquid a is formed by mixing sodium carbonate, sodium bicarbonate and deionized water according to the weight ratio of 1: 100.

The water absorbing layer is prepared by the following steps:

step S11, adding span 80 into a four-neck flask filled with cyclohexane, heating in a water bath at 50 ℃, magnetically stirring, introducing nitrogen to discharge air, and stirring at a constant speed for 1h to prepare a solution c for later use; dropwise adding a sodium hydroxide solution with the mass fraction of 15% into acrylic acid, sequentially adding acrylamide and N, N-methylene bisacrylamide after magnetically stirring for 10min, continuously stirring for 10min, dropwise adding a potassium persulfate aqueous solution with the mass fraction of 15% to obtain a solution d, dropwise adding the solution d into the solution c, controlling the dropwise adding time to be 10min, uniformly stirring and reacting for 2h after the dropwise adding is finished, filtering and drying after the reaction is finished to obtain a filling material, controlling the weight ratio of span 80 to cyclohexane to be 1: 1, the weight ratio of the acrylic acid, the acrylamide, the N, N-methylene bisacrylamide to the potassium persulfate aqueous solution to be 1: 0.5: 5: 0.1, and controlling the volume ratio of the solution d to the solution c to be 1: 2;

step S12, adding acrylic acid and acrylamide into deionized water, stirring at a constant speed of 150r/min for 30min, then adding acrylic acid-2-hydroxypropyl, introducing nitrogen to discharge air, heating to 60 ℃, adding a potassium persulfate aqueous solution with the mass fraction of 10%, heating to 80 ℃, stirring at a constant speed and reacting for 2h, then cooling and filtering to obtain a polymer, uniformly mixing the polymer and the filler prepared in the step S1, preparing water-absorbing fibers through wet spinning, weaving into a water-absorbing layer, controlling the weight ratio of acrylic acid, acrylamide, acrylic acid-2-hydroxypropyl and potassium persulfate to be 5: 1: 0.1: 0.02, and controlling the weight ratio of the polymer to the filler to be 1: 10.

Example 2

A white pad for polishing a display screen comprises a friction layer on the surface layer and a water absorption layer arranged inside the friction layer;

the white pad for polishing the display screen is prepared by the following method:

the periphery of the water absorption layer is sewed with a friction layer, and the thickness of the water absorption layer and the friction layer is controlled to be 2: 1.

The friction layer is prepared by the following steps:

step S1, adding bleached softwood kraft pulp into a three-neck flask, adding mixed liquor a, stirring at a constant speed of 300r/min while dropwise adding, controlling the dropwise adding time to be 10min, sequentially adding sodium bromide and 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide after completely adding, magnetically stirring for 30min, then adding sodium hypochlorite and deionized water, stirring at a constant speed and reacting for 4h to obtain mixed pulp, dropwise adding dilute hydrochloric acid with a mass fraction of 15%, stirring for 30min, washing with deionized water to be neutral, performing ultrasonic treatment to obtain treated nano-cellulose, controlling the dosage ratio of the bleached softwood kraft pulp to the mixed liquor a, sodium bromide, 2,6, 6-tetramethylpiperidine-nitrogen-oxide, sodium chlorate and deionized water to be 1 g: 100 mL: 0.1 g: 0.01 g: 0.1 g: 500mL, the dosage of the dilute hydrochloric acid is 3 percent of the weight of the mixed slurry;

step S2, adding octadecylamine into N, N-dimethyl ammonium formate according to the weight ratio of 1: 5, and uniformly stirring for 15min to prepare a solution b; adding the treated nano-cellulose into a conical flask filled with deionized water, heating in a water bath at 45 ℃, magnetically stirring for 30min, adding the solution b, uniformly mixing, adjusting the pH value with a sodium hydroxide aqueous solution with the concentration of 0.1mol/L until the pH value is 8, uniformly stirring, reacting for 4h, centrifuging, washing with deionized water and absolute ethyl alcohol for three times respectively to prepare modified nano-cellulose, carrying out electrostatic spinning to prepare modified fiber, and controlling the weight ratio of the nano-cellulose to the solution b to be 5: 1;

and step S3, mixing the modified fibers and the polyester fibers, then puncturing and rebounding through a high-pressure water needle, dehydrating the fibers after the fibers are intertwined with each other through a vacuum water absorption device, sending the fibers into a penetrating type drying cylinder drying machine for drying, then detecting cloth, cutting, coiling and sewing to obtain a friction layer, and controlling the weight ratio of the modified fibers to the polyester fibers to be 5: 1.

The mixed liquid a is formed by mixing sodium carbonate, sodium bicarbonate and deionized water according to the weight ratio of 1: 100.

The water absorbing layer is prepared by the following steps:

step S11, adding span 80 into a four-neck flask filled with cyclohexane, heating in a water bath at 50 ℃, magnetically stirring, introducing nitrogen to discharge air, and stirring at a constant speed for 1h to prepare a solution c for later use; dropwise adding a sodium hydroxide solution with the mass fraction of 15% into acrylic acid, sequentially adding acrylamide and N, N-methylene bisacrylamide after magnetically stirring for 10min, continuously stirring for 10min, dropwise adding a potassium persulfate aqueous solution with the mass fraction of 15% to obtain a solution d, dropwise adding the solution d into the solution c, controlling the dropwise adding time to be 10min, uniformly stirring and reacting for 2h after the dropwise adding is finished, filtering and drying after the reaction is finished to obtain a filling material, controlling the weight ratio of span 80 to cyclohexane to be 1: 1, the weight ratio of the acrylic acid, the acrylamide, the N, N-methylene bisacrylamide to the potassium persulfate aqueous solution to be 1: 0.5: 5: 0.1, and controlling the volume ratio of the solution d to the solution c to be 1: 2;

step S12, adding acrylic acid and acrylamide into deionized water, stirring at a constant speed of 150r/min for 30min, then adding acrylic acid-2-hydroxypropyl, introducing nitrogen to discharge air, heating to 60 ℃, adding a potassium persulfate aqueous solution with the mass fraction of 10%, heating to 80 ℃, stirring at a constant speed and reacting for 2h, then cooling and filtering to obtain a polymer, uniformly mixing the polymer and the filler prepared in the step S1, preparing water-absorbing fibers through wet spinning, weaving into a water-absorbing layer, controlling the weight ratio of acrylic acid, acrylamide, acrylic acid-2-hydroxypropyl and potassium persulfate to be 5: 1: 0.1: 0.02, and controlling the weight ratio of the polymer to the filler to be 1: 10.

Example 3

A white pad for polishing a display screen comprises a friction layer on the surface layer and a water absorption layer arranged inside the friction layer;

the white pad for polishing the display screen is prepared by the following method:

the friction layer is sewed around the water absorption layer, and the thickness of the water absorption layer and the friction layer is controlled to be 4: 1.

The friction layer is prepared by the following steps:

step S1, adding bleached softwood kraft pulp into a three-neck flask, adding mixed liquor a, stirring at a constant speed of 300r/min while dropwise adding, controlling the dropwise adding time to be 10min, sequentially adding sodium bromide and 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide after completely adding, magnetically stirring for 30min, then adding sodium hypochlorite and deionized water, stirring at a constant speed and reacting for 4h to obtain mixed pulp, dropwise adding dilute hydrochloric acid with a mass fraction of 15%, stirring for 30min, washing with deionized water to be neutral, performing ultrasonic treatment to obtain treated nano-cellulose, controlling the dosage ratio of the bleached softwood kraft pulp to the mixed liquor a, sodium bromide, 2,6, 6-tetramethylpiperidine-nitrogen-oxide, sodium chlorate and deionized water to be 1 g: 100 mL: 0.1 g: 0.01 g: 0.2 g: 500mL, the dosage of the dilute hydrochloric acid is 4 percent of the weight of the mixed slurry;

step S2, adding octadecylamine into N, N-dimethyl ammonium formate according to the weight ratio of 1: 5, and uniformly stirring for 15min to prepare a solution b; adding the treated nano-cellulose into a conical flask filled with deionized water, heating in a water bath at 45 ℃, magnetically stirring for 30min, adding the solution b, uniformly mixing, adjusting the pH value with a sodium hydroxide aqueous solution with the concentration of 0.1mol/L until the pH value is 8, uniformly stirring, reacting for 4h, centrifuging, washing with deionized water and absolute ethyl alcohol for three times respectively to prepare modified nano-cellulose, carrying out electrostatic spinning to prepare modified fiber, and controlling the weight ratio of the nano-cellulose to the solution b to be 5: 1;

and step S3, mixing the modified fibers and the polyester fibers, then puncturing and rebounding through a high-pressure water needle, dehydrating the fibers after the fibers are intertwined with each other through a vacuum water absorption device, sending the fibers into a penetrating type drying cylinder drying machine for drying, then detecting cloth, cutting, coiling and sewing to obtain a friction layer, and controlling the weight ratio of the modified fibers to the polyester fibers to be 5: 1.

The mixed liquid a is formed by mixing sodium carbonate, sodium bicarbonate and deionized water according to the weight ratio of 1: 100.

The water absorbing layer is prepared by the following steps:

step S11, adding span 80 into a four-neck flask filled with cyclohexane, heating in a water bath at 50 ℃, magnetically stirring, introducing nitrogen to discharge air, and stirring at a constant speed for 1h to prepare a solution c for later use; dropwise adding a sodium hydroxide solution with the mass fraction of 15% into acrylic acid, sequentially adding acrylamide and N, N-methylene bisacrylamide after magnetically stirring for 10min, continuously stirring for 10min, dropwise adding a potassium persulfate aqueous solution with the mass fraction of 15% to obtain a solution d, dropwise adding the solution d into the solution c, controlling the dropwise adding time to be 10min, uniformly stirring and reacting for 2h after the dropwise adding is finished, filtering and drying after the reaction is finished to obtain a filling material, controlling the weight ratio of span 80 to cyclohexane to be 1: 1, the weight ratio of the acrylic acid, the acrylamide, the N, N-methylene bisacrylamide to the potassium persulfate aqueous solution to be 1: 0.5: 5: 0.1, and controlling the volume ratio of the solution d to the solution c to be 1: 2;

step S12, adding acrylic acid and acrylamide into deionized water, stirring at a constant speed of 150r/min for 30min, then adding acrylic acid-2-hydroxypropyl, introducing nitrogen to discharge air, heating to 60 ℃, adding a potassium persulfate aqueous solution with the mass fraction of 10%, heating to 80 ℃, stirring at a constant speed and reacting for 2h, then cooling and filtering to obtain a polymer, uniformly mixing the polymer and the filler prepared in the step S1, preparing water-absorbing fibers through wet spinning, weaving into a water-absorbing layer, controlling the weight ratio of acrylic acid, acrylamide, acrylic acid-2-hydroxypropyl and potassium persulfate to be 5: 1: 0.1: 0.02, and controlling the weight ratio of the polymer to the filler to be 1: 10.

Example 4

A white pad for polishing a display screen comprises a friction layer on the surface layer and a water absorption layer arranged inside the friction layer;

the white pad for polishing the display screen is prepared by the following method:

the friction layer is sewed around the water absorption layer, and the thickness of the water absorption layer and the friction layer is controlled to be 5: 1.

The friction layer is prepared by the following steps:

step S1, adding bleached softwood kraft pulp into a three-neck flask, adding mixed liquor a, stirring at a constant speed of 300r/min while dropwise adding, controlling the dropwise adding time to be 10min, sequentially adding sodium bromide and 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide after completely adding, magnetically stirring for 30min, then adding sodium hypochlorite and deionized water, stirring at a constant speed and reacting for 4h to obtain mixed pulp, dropwise adding dilute hydrochloric acid with a mass fraction of 15%, stirring for 30min, washing with deionized water to be neutral, performing ultrasonic treatment to obtain treated nano-cellulose, controlling the dosage ratio of the bleached softwood kraft pulp to the mixed liquor a, sodium bromide, 2,6, 6-tetramethylpiperidine-nitrogen-oxide, sodium chlorate and deionized water to be 1 g: 100 mL: 0.1 g: 0.01 g: 0.2 g: 500mL, the dosage of the dilute hydrochloric acid is 5 percent of the weight of the mixed slurry;

step S2, adding octadecylamine into N, N-dimethyl ammonium formate according to the weight ratio of 1: 5, and uniformly stirring for 15min to prepare a solution b; adding the treated nano-cellulose into a conical flask filled with deionized water, heating in a water bath at 45 ℃, magnetically stirring for 30min, adding the solution b, uniformly mixing, adjusting the pH value with a sodium hydroxide aqueous solution with the concentration of 0.1mol/L until the pH value is 8, uniformly stirring, reacting for 4h, centrifuging, washing with deionized water and absolute ethyl alcohol for three times respectively to prepare modified nano-cellulose, carrying out electrostatic spinning to prepare modified fiber, and controlling the weight ratio of the nano-cellulose to the solution b to be 5: 1;

and step S3, mixing the modified fibers and the polyester fibers, then puncturing and rebounding through a high-pressure water needle, dehydrating the fibers after the fibers are intertwined with each other through a vacuum water absorption device, sending the fibers into a penetrating type drying cylinder drying machine for drying, then detecting cloth, cutting, coiling and sewing to obtain a friction layer, and controlling the weight ratio of the modified fibers to the polyester fibers to be 5: 1.

The mixed liquid a is formed by mixing sodium carbonate, sodium bicarbonate and deionized water according to the weight ratio of 1: 100.

The water absorbing layer is prepared by the following steps:

step S11, adding span 80 into a four-neck flask filled with cyclohexane, heating in a water bath at 50 ℃, magnetically stirring, introducing nitrogen to discharge air, and stirring at a constant speed for 1h to prepare a solution c for later use; dropwise adding a sodium hydroxide solution with the mass fraction of 15% into acrylic acid, sequentially adding acrylamide and N, N-methylene bisacrylamide after magnetically stirring for 10min, continuously stirring for 10min, dropwise adding a potassium persulfate aqueous solution with the mass fraction of 15% to obtain a solution d, dropwise adding the solution d into the solution c, controlling the dropwise adding time to be 10min, uniformly stirring and reacting for 2h after the dropwise adding is finished, filtering and drying after the reaction is finished to obtain a filling material, controlling the weight ratio of span 80 to cyclohexane to be 1: 1, the weight ratio of the acrylic acid, the acrylamide, the N, N-methylene bisacrylamide to the potassium persulfate aqueous solution to be 1: 0.5: 5: 0.1, and controlling the volume ratio of the solution d to the solution c to be 1: 2;

step S12, adding acrylic acid and acrylamide into deionized water, stirring at a constant speed of 150r/min for 30min, then adding acrylic acid-2-hydroxypropyl, introducing nitrogen to discharge air, heating to 60 ℃, adding a potassium persulfate aqueous solution with the mass fraction of 10%, heating to 80 ℃, stirring at a constant speed and reacting for 2h, then cooling and filtering to obtain a polymer, uniformly mixing the polymer and the filler prepared in the step S1, preparing water-absorbing fibers through wet spinning, weaving into a water-absorbing layer, controlling the weight ratio of acrylic acid, acrylamide, acrylic acid-2-hydroxypropyl and potassium persulfate to be 5: 1: 0.1: 0.02, and controlling the weight ratio of the polymer to the filler to be 1: 10.

Comparative example 1

This comparative example compared to example 1, where the friction layer was replaced by a nonwoven.

Comparative example 2

This comparative example is a glass member polishing pad in the market.

Examples 1-4 and comparative examples 1-3 were tested and the results are shown in the following table:

as can be seen from the above table, the water absorption amounts of examples 1 to 4 were 8.10 to 8.22 (mg/cm)²) Comparative examples 1 to 2 had water absorption amounts of 2.3 to 8.08 (mg/cm)²) (ii) a The surface water contact angles of examples 1-4 were 101-.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (6)

1. A white pad for polishing a display screen is characterized by comprising a friction layer on the surface layer and a water absorption layer arranged inside the friction layer;

the white pad for polishing the display screen is prepared by the following method:

sewing a friction layer around the water absorption layer, and controlling the thickness of the water absorption layer and the friction layer to be 1-5: 1;

the friction layer is prepared by the following steps:

step S1, adding bleached softwood kraft pulp into a three-neck flask, adding the mixed solution a, stirring at a constant speed while dropwise adding, controlling the dropwise adding time to be 10min, sequentially adding sodium bromide and 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide after completely adding, magnetically stirring for 30min, then adding sodium hypochlorite and deionized water, stirring at a constant speed and reacting for 4h to prepare mixed slurry, dropwise adding dilute hydrochloric acid with the mass fraction of 15%, stirring for 30min, then washing with deionized water to be neutral, and performing ultrasonic treatment to prepare treated nano-cellulose;

step S2, adding octadecylamine into N, N-dimethyl ammonium formate according to the weight ratio of 1: 5, and uniformly stirring for 15min to prepare a solution b; adding the treated nano-cellulose into a conical flask filled with deionized water, heating in a water bath at 45-50 ℃, magnetically stirring for 30min, adding the solution b, uniformly mixing, adjusting the pH value by using a sodium hydroxide aqueous solution with the concentration of 0.1mol/L until the pH value is 7-8, uniformly stirring and reacting for 4h, centrifuging, washing with deionized water and absolute ethyl alcohol for three times respectively to prepare modified nano-cellulose, and performing electrostatic spinning to prepare modified fiber, wherein the weight ratio of the nano-cellulose to the solution b is controlled to be 5: 1;

and step S3, mixing the modified fibers and the polyester fibers, then puncturing and rebounding through a high-pressure water needle, dehydrating the fibers after the fibers are intertwined with each other through a vacuum water absorption device, sending the fibers into a penetrating type drying cylinder drying machine for drying, then detecting cloth, cutting, coiling and sewing to obtain a friction layer, and controlling the weight ratio of the modified fibers to the polyester fibers to be 5: 1.

2. The white pad for polishing a display screen of claim 1, wherein the mixed solution a is a mixture of sodium carbonate, sodium bicarbonate and deionized water in a weight ratio of 1: 100.

3. The white pad for polishing a display screen of claim 1, wherein the water-absorbing layer comprises the following steps:

step S11, adding span 80 into a four-neck flask filled with cyclohexane, heating in a water bath at 50 ℃, magnetically stirring, introducing nitrogen to discharge air, and stirring at a constant speed for 1h to prepare a solution c for later use; dropwise adding a sodium hydroxide solution with the mass fraction of 15% into acrylic acid, sequentially adding acrylamide and N, N-methylene bisacrylamide after magnetically stirring for 10min, continuously stirring for 10min, dropwise adding a potassium persulfate aqueous solution with the mass fraction of 15% to prepare a solution d, dropwise adding the solution d into the solution c, controlling the dropwise adding time to be 10min, uniformly stirring and reacting for 2h after the dropwise adding is finished, and filtering and drying after the reaction is finished to prepare a filling material;

step S12, adding acrylic acid and acrylamide into deionized water, stirring at a constant speed of 250r/min for 30min at a speed of 150 plus one year, then adding 2-hydroxypropyl acrylate, introducing nitrogen to discharge air, heating to 60 ℃, adding 10% by mass of potassium persulfate aqueous solution, heating to 80 ℃, stirring at a constant speed and reacting for 2h, then cooling and carrying out suction filtration to obtain a polymer, uniformly mixing the polymer and the filler prepared in the step S1, preparing water-absorbing fibers through wet spinning, and weaving the water-absorbing fibers into a water-absorbing layer.

4. The white pad for display screen polishing as set forth in claim 3, wherein the weight ratio of span 80 and cyclohexane is controlled to 1: 1 in step S11, the weight ratio of acrylic acid, acrylamide, N-methylenebisacrylamide and aqueous solution of potassium persulfate is 1: 0.5: 5: 0.1, the volume ratio of solution d and solution c is 1: 2, the weight ratio of acrylic acid, acrylamide, 2-hydroxypropyl acrylate and potassium persulfate is controlled to 5: 1: 0.1: 0.02 in step S12, and the weight ratio of polymer and filler is 1: 10.

5. The white pad for polishing a display screen of claim 1, wherein the amount ratio of the bleached softwood kraft pulp to the mixed liquor a to the sodium bromide to the 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide to the sodium chlorate to the deionized water is controlled to be 1g to 100mL to 0.1g to 0.01g to 0.1-0.2g to 500mL, and the amount of the dilute hydrochloric acid is 1-5% of the weight of the mixed slurry.

6. The method for producing a white pad for display screen polishing as set forth in claim 1, comprising the steps of:

the periphery of the water absorption layer is sewed with a friction layer, and the thickness of the water absorption layer and the friction layer is controlled to be 1-5: 1.