CN111172803B - Method for preparing water-absorbing material - Google Patents
Method for preparing water-absorbing material Download PDFInfo
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- CN111172803B CN111172803B CN202010008683.0A CN202010008683A CN111172803B CN 111172803 B CN111172803 B CN 111172803B CN 202010008683 A CN202010008683 A CN 202010008683A CN 111172803 B CN111172803 B CN 111172803B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/24—Addition to the formed paper during paper manufacture
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/002—Tissue paper; Absorbent paper
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a method for manufacturing a water-absorbing material, which comprises the following steps: (1) respectively carrying out net-feeding molding on the surface sizing agent and the bottom sizing agent to obtain wet surface paper and wet bottom paper; the relative water content of the wet surface layer paper and the wet bottom layer paper is 50-80%; (2) respectively spraying the wet surface layer paper and the wet bottom layer paper prepared in the step (1) with high molecular water-absorbing resin, and compounding the wet surface layer paper and the wet bottom layer paper respectively sprayed with the high molecular water-absorbing resin to prepare wet paper sheets; (3) and (3) sequentially squeezing and drying the wet paper pages prepared in the step (2) to prepare the water absorbing material. The method adopts a compound mode of compounding the high molecular water-absorbent resin by a wet method, and the high molecular water-absorbent resin is completely embedded in the paper fibers, so that the contact area between the high molecular water-absorbent resin and the paper fibers is greatly increased, and the liquid conductivity of the paper fibers and the high molecular water-absorbent resin is enhanced, thereby greatly increasing the water absorption capacity and the water absorption speed of the water-absorbent material.
Description
The application is a divisional application of an invention patent application with the application date of '10 and 17 months in 2017', the application number of '201710966882.0' and the name of 'a manufacturing method of a water absorbing material'.
Technical Field
The invention relates to the technical field of water-absorbing materials, in particular to a manufacturing method of a water-absorbing material.
Background
The main absorption function in the wood pulp core structure of the high-absorption product is high-molecular water-absorption resin and wood pulp. At present, the compounding mode of the water-absorbent resin and the wood pulp paper is dry compounding, and after glue is sprayed on the surface of the wood pulp layer, the high-molecular water-absorbent resin is dispersed on the surface of the wood pulp paper layer. The dry glue spraying compounding can not only cause sanitation hidden troubles to the water absorbing material, but also influence the water absorbing speed after the glue is dried; and in the application process after the compounding, the compounding is insufficient, so that part of the high-molecular water-absorbent resin leaks, and the water absorption capacity is influenced. After dry compounding, the high-molecular water-absorbent resin is distributed on the surface layer of the paper surface and is not in sufficient contact with wood pulp fibers, so that the water-absorbent structure layer has poor conductivity to liquid and the water absorption speed is influenced.
At present, a method for preparing a water absorbing material by adopting wet composite macromolecular water absorbing resin is not reported.
Disclosure of Invention
The invention aims to overcome the defects of the prior art in the prior art that the water absorbing material is prepared by compounding the high molecular water absorbing resin by a dry method, and provides a novel method for preparing the water absorbing material, namely, the high molecular water absorbing resin is added in the early stage of the formation of the wood pulp paper layer, so that the contact area between the high molecular water absorbing resin and the paper sheet fiber can be greatly increased, the liquid conductivity between the paper sheet fiber and the high molecular water absorbing resin is enhanced, and the liquid absorption capacity and the liquid absorption speed of the water absorbing material are greatly increased.
The invention provides a method for manufacturing a water-absorbing material, which comprises the following steps:
(1) respectively carrying out net-feeding molding on the surface sizing agent and the bottom sizing agent to obtain wet surface paper and wet bottom paper;
(2) respectively spraying the wet surface layer paper and the wet bottom layer paper prepared in the step (1) with high molecular water-absorbing resin, and compounding the wet surface layer paper and the wet bottom layer paper respectively sprayed with the high molecular water-absorbing resin to prepare wet paper sheets;
(3) and (3) sequentially squeezing and drying the wet paper pages prepared in the step (2) to prepare the water absorbing material.
Preferably, the method further comprises the step of pulping and refining the raw materials of the surface pulp and the bottom pulp respectively before the step (1), and then preparing pulp to obtain the surface pulp and the bottom pulp respectively.
Preferably, the method further comprises the step of sequentially coiling, slitting and packaging the water-absorbing material prepared in the step (3).
Preferably, the concentration of the crushed pulp is 4 wt% to 6 wt%; the pulping time is 10-20 min; the grinding power of the grinding is 280-360 kW; the passing amount of the pulp in the pulping process is 1800-2100L/min; the concentration of the ground pulp is 3.8-4.2 wt%; an additive is added in the pulp preparation process, and the additive is selected from the group consisting of a wet strength agent and a softening agent.
In particular, the raw material of the top size and/or the bottom size consists of wood pulp and/or straw pulp; the wood pulp consists of softwood pulp and/or hardwood pulp; preferably, the raw material of the surface sizing agent and/or the bottom sizing agent consists of softwood pulp and hardwood pulp, and the weight ratio of the softwood pulp to the hardwood pulp is (20-40): (60-80).
Preferably, the concentration of the upper wire in step (1) is 0.6 wt% to 0.8 wt%; the relative water content of the wet surface layer paper and/or the wet bottom layer paper prepared in the step (1) is 50-80%; the gram weight of the wet surface layer paper prepared in the step (1) after being dried is 20-50g/m2The gram weight of the wet bottom layer paper after being dried is 20-60g/m2(ii) a The spraying amount of the super absorbent resin of the wet surface layer paper and/or the wet bottom layer paper in the step (2) is 35-60g/m2(ii) a The relative water content of the water absorbing material prepared in the step (3) is 6-8%.
Preferably, the polymeric water-absorbing resin is prepared from the following raw materials: acrylic acid, 48-50 wt% sodium hydroxide solution, polyethylene glycol, diacrylate, water, an initiator, ethanol, glycerol, a surface treatment fluid and silicon dioxide, and the preparation process comprises the following steps:
(a) mixing acrylic acid, water, polyethylene glycol and diacrylate, introducing nitrogen to remove oxygen, adding an initiator to initiate polymerization reaction, and naturally heating the polymerization reaction;
(b) regarding that the temperature of the polymerization reaction in the step (a) does not rise any more as the reaction is finished, after the reaction is finished, preserving the heat at the temperature of 80-90 ℃ to obtain polymer colloid, and granulating the polymer colloid to obtain resin particles;
(c) neutralizing the resin particles obtained in the step (b) with a sodium hydroxide solution until the pH value is 6.0-6.5, then spraying a surface treatment solution for surface treatment, and drying and crushing the resin particles in sequence to obtain water-absorbent resin particles;
(d) and (c) mixing and stirring the water-absorbent resin particles obtained in the step (c) with ethanol and glycerol uniformly, adding silicon dioxide, continuously stirring uniformly, and finally drying to obtain the high-molecular water-absorbent resin.
Preferably, the dosage of the raw materials of the high molecular water-absorbing resin is as follows: according to the parts by weight, 100-300 parts of acrylic acid, 100-300 parts of sodium hydroxide solution with the concentration of 48-50 wt%, 400 parts of polyethylene glycol, 5-10 parts of diacrylate, 100 parts of water, 700 parts of initiator, 0.5-2 parts of ethanol, 20-50 parts of glycerol, 2-6 parts of surface treatment liquid and 2-5 parts of silicon dioxide; the surface treatment liquid comprises 1, 4-butanediol diglycidyl ether and water, and the weight ratio of the 1, 4-butanediol diglycidyl ether to the water is 1: 1.
Preferably, after the nitrogen is introduced for deoxygenation in the step (a), the oxygen content is within 1 ppm; introducing nitrogen to remove oxygen in the step (a), and adding an initiator at the temperature of 5-10 ℃; the peak value of the natural temperature rise in the step (a) is between 85 and 90 ℃; the heat preservation time in the step (b) is 0.5 to 1.5 hours; the temperature of the drying in the step (c) and/or the step (d) is 110-130 ℃.
Preferably, the initiator is a redox initiator; the oxidizing agent in the redox initiator is selected from the group consisting of hydrogen peroxide, ammonium persulfate and potassium persulfate, and the reducing agent in the redox initiator is selected from the group consisting of sodium bisulfite and ascorbic acid.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the method adopts a compounding mode of compounding the high molecular water-absorbent resin by a wet method, and the high molecular water-absorbent resin is compounded with the paper fibers at the early stage of paper forming, so that the high molecular water-absorbent resin is completely embedded in the paper fibers, the contact area of the high molecular water-absorbent resin and the fibers is greatly increased, and the liquid conductivity of the paper fibers and the high molecular water-absorbent resin is enhanced, thereby greatly increasing the liquid absorption capacity and absorption speed of the water-absorbent material.
(2) The water-absorbent material of the present invention has good gel water retention because the high molecular water-absorbent resin is in a gel state after absorbing water and absorbed water is hardly squeezed out.
(3) In the invention, inert solid hydrophilic particles (silicon dioxide) are used for further surface treatment of the water-absorbent resin, so that the high water absorption performance of the resin is ensured, and the liquid permeability of the resin particles is improved.
(4) The invention adopts the papermaking forming, the paper sheet evenness is good, and the softness and the hand feeling of the paper sheet after the paper sheet forming are good due to the addition of the softening agent and the control of the beating degree of the pulp in the early stage, the moisture of the formed paper and the like. During beating, the short fibers (fibers in hardwood pulp) in the pulp have large proportion, the specific surface area of the fibers is large, the air permeability among the fibers is good, meanwhile, a certain proportion of long fibers (fibers in softwood pulp) are added, the interweaving among the fibers is enhanced, and the paper strength is improved.
(5) The water absorbing material prepared by the method can be used for producing sanitary products such as paper diapers, women sanitary products, adult incontinence products and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a method for manufacturing a water-absorbing material, which comprises the following steps:
(1) respectively carrying out net-feeding molding on the surface sizing agent and the bottom sizing agent to obtain wet surface paper and wet bottom paper;
(2) respectively spraying the wet surface layer paper and the wet bottom layer paper prepared in the step (1) with high molecular water-absorbing resin, and compounding the wet surface layer paper and the wet bottom layer paper respectively sprayed with the high molecular water-absorbing resin to prepare wet paper sheets;
(3) and (3) sequentially squeezing and drying the wet paper pages prepared in the step (2) to prepare the water absorbing material. Specifically, the wet paper sheet is pressed and dehydrated, and the paper sheet after pressing and dehydration is placed in a drying cylinder for further drying and dehydration, so that the water absorbing material is obtained.
According to some preferred embodiments, the method further comprises, before the step (1), pulping and refining the raw materials of the surface pulp and/or the bottom pulp, and then preparing pulp to obtain the surface pulp and the bottom pulp respectively; the concentration of the crushed pulp is 4-6 wt%; the pulping time is 10-20 min; the grinding power of the grinding is 280-360 kW; the passing amount of the pulp in the pulping process is 1800-2100L/min; the concentration of the ground pulp is 3.8-4.2 wt%; an additive is added in the pulp preparation process, and the additive is selected from the group consisting of a wet strength agent and a softening agent. For example, the wet strength agent can be selected from polyamide epichlorohydrin resin products; the softening agent can be hydrophilic organic silicon products.
According to some preferred embodiments, the method further comprises the step of sequentially coiling, slitting and packaging the water-absorbing material prepared in the step (3).
According to some preferred embodiments, the raw material of the top size and/or the bottom size (the raw material of the top size and the bottom size may be the same or different) consists of wood pulp and/or straw pulp; the wood pulp consists of softwood pulp and/or hardwood pulp; preferably, the raw material of the surface sizing agent and/or the bottom sizing agent consists of softwood pulp and hardwood pulp, and the weight ratio of the softwood pulp to the hardwood pulp is (20-40): (60-80) (e.g., 20:80, 25:75, 30:70, 35:65, or 40: 60).
According to some preferred embodiments, the concentration of the upper wire in step (1) is 0.6 wt% to 0.8 wt%; the relative water content of the wet surface layer paper and/or the wet bottom layer paper prepared in the step (1) is 50-80%; the gram weight of the wet surface layer paper prepared in the step (1) after being dried is 20-50g/m2The gram weight of the wet bottom layer paper after being dried is 20-60g/m2(ii) a The spraying amount of the super absorbent resin of the wet surface layer paper and/or the wet bottom layer paper in the step (2) is 35-60g/m2(ii) a The relative water content of the water absorbing material prepared in the step (3) is 6-8%. And (3) spraying the amount of the wet surface layer paper or the wet bottom layer paper by using the high-molecular water-absorbent resin in the step (2).
According to some more specific embodiments, softwood pulp and hardwood pulp (both 100% whole wood pulp and virgin wood pulp) are pulped separately in a hydropulper at 4 wt% to 6 wt% (e.g., 4 wt%, 5 wt% or 6 wt%) for 10 to 20min (e.g., 10, 15 or 20min), and the pulped pulp is then refined in a refiner at 280-360kW (e.g., 280, 290, 300, 310, 320, 330, 340, 350 or 360kW) with the pulp passing rate controlled at 1800L/min (e.g., 1800, 1900, 2000 or 2100L/min) and the consistency refined at 3.8 wt% to 4.2 wt% (e.g., 3.8 wt%; 2100L/min) with the pulp passing rate controlled at 1800L/min, 3.9 wt%, 4.0 wt%, 4.1 wt%, or 4.2 wt%); conveying the ground pulp into a pulp mixing pool for pulp mixing, wherein the weight ratio of softwood pulp to hardwood pulp is 30:70, and a wet strength agent (such as polyamide polyepichlorohydrin resin) and a softening agent (such as hydrophilic organosilicon softening agent) are added simultaneously in the pulp mixing process to obtain surface pulp and bottom pulp; then, the surface pulp and the bottom pulp are conveyed to be on-line through a head box, the concentration of the on-line surface pulp and the bottom pulp is 0.6 wt% -0.8 wt% (such as 0.6 wt%, 0.7 wt% or 0.8 wt%), the surface pulp and the bottom pulp dehydrated through a net part are gradually formed, wet surface layer paper and wet bottom layer paper are respectively obtained, the relative water content of the wet surface layer paper and the wet bottom layer paper is controlled to be 50% -80% (such as 50%, 60%, 70% or 80%), the wet surface layer paper and the wet bottom layer paper are respectively sprayed with high molecular water-absorbing resin, and the wet surface layer paper and the wet bottom layer paper respectively sprayed with high molecular water-absorbing resin are immediately compounded (instantly compounded) at the same time, so that wet paper sheets are prepared; finally, directly squeezing and dehydrating the instantly compounded wet paper, placing the paper after squeezing and dehydrating in a drying cylinder for further drying and dehydrating to obtain a water absorbing material with a surface layer, high-molecular water absorbing resin and a bottom layer completely compounded into a whole, so that the relative water content of the water absorbing material is 6% -8% (such as 6%, 7% or 8%); and finally, sequentially coiling, cutting and packaging the prepared water absorbing material.
The water absorbing material is made of an upper layer molding structure and a lower layer molding structure. The gram weight of the water-absorbing material is preferably 60-80g/m2Wherein the gram weight of the surface paper in a dry state in the process of manufacturing the water absorbing material is 20-50g/m2The gram weight of the bottom layer paper in a dry state is 20-60g/m2。
The relative water content of the wet surface layer paper and the wet bottom layer paper is the percentage of the weight of water contained in the wet surface layer paper and the wet bottom layer paper to the weight of the wet surface layer paper and the weight of the wet bottom layer paper respectively; the relative water content of the water absorbent material in the present invention is a percentage of the weight of water contained in the water absorbent material to the weight of the water absorbent material.
The high molecular water-absorbent resin in the invention can be a commercially available sanitary water-absorbent resin. Preferably, the high-molecular water-absorbing resin is a combination of one or more of polyacrylate, starch graft copolymer, crosslinked carboxymethyl cellulose derivative, saponified acrylate-vinyl copolymer, modified crosslinked polyvinyl alcohol, neutralized crosslinked polyacrylic acid, crosslinked polyacrylate and hydrolyzed starch-acrylonitrile medium copolymer. More preferably, the polymeric water-absorbent resin is prepared from the following raw materials: acrylic acid, 48-50 wt% sodium hydroxide solution, polyethylene glycol, diacrylate, water, an initiator, ethanol, glycerol, a surface treatment fluid and silicon dioxide, and the preparation process comprises the following steps:
(a) mixing acrylic acid, water, polyethylene glycol and diacrylate, introducing nitrogen to remove oxygen, adding an initiator to initiate polymerization reaction, and naturally heating the polymerization reaction;
(b) regarding that the temperature of the polymerization reaction in the step (a) does not rise any more as the reaction is finished, after the reaction is finished, preserving the heat at the temperature of 80-90 ℃ to obtain polymer colloid, and granulating the polymer colloid to obtain resin particles;
(c) neutralizing the resin particles obtained in the step (b) with a sodium hydroxide solution until the pH value is 6.0-6.5, then spraying a surface treatment solution for surface treatment, and drying and crushing the resin particles in sequence to obtain water-absorbent resin particles;
(d) and (c) mixing and stirring the water-absorbent resin particles obtained in the step (c) with ethanol and glycerol uniformly, adding silicon dioxide, continuously stirring uniformly, and finally drying to obtain the high-molecular water-absorbent resin.
According to some preferred embodiments, the amount of the raw materials of the high molecular water-absorbing resin is: 100-300 (e.g., 100, 200 or 300) of acrylic acid, 100-300 (e.g., 100, 200 or 300) of sodium hydroxide solution with the concentration of 48-50 wt%, 400 of polyethylene glycol, 5-10 (e.g., 5, 6, 7, 8, 9 or 10) of diacrylate, 100-700 (e.g., 100, 200, 300, 400, 500, 600 or 700) of water, 0.5-2 (e.g., 0.5, 1, 1.5 or 2) of an initiator, 20-50 (e.g., 20, 30, 40 or 50) of ethanol, 1-20 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18 or 20) of glycerol, 2-6 (e.g., 2, 3, 4, 5 or 6) of a surface treatment liquid, 2-6 (e.g., 2, 3, 4, 5 or 5) of silica; the surface treatment liquid contains 1, 4-butanediol diglycidyl ether 1-3 (e.g., 1, 2, or 3) and water 1-3 (e.g., 1, 2, or 3), and the weight ratio of the 1, 4-butanediol diglycidyl ether to the water is 1: 1; the water in the present invention is preferably deionized water.
According to some preferred embodiments, after the nitrogen is introduced to remove oxygen in step (a), the oxygen content is within 1 ppm; introducing nitrogen to remove oxygen in the step (a), and adding an initiator at the temperature of 5-10 ℃ (for example, 5 ℃, 6 ℃, 7 ℃, 8 ℃, 9 ℃ or 10 ℃); the peak value of the natural temperature rise in the step (a) is between 85 ℃ and 90 ℃ (for example, 85 ℃, 86 ℃, 87 ℃, 88 ℃, 89 ℃ or 90 ℃); the incubation time in step (b) is from 0.5 to 1.5 hours (e.g. 0.5, 1 or 1.5 hours); the temperature of the drying in step (c) and/or step (d) is 110-. The peak of the natural temperature rise in the present invention indicates a temperature at which the polymerization reaction temperature in the step (a) is not raised any more.
According to some preferred embodiments, the initiator is a redox initiator; the oxidizing agent in the redox initiator is selected from the group consisting of hydrogen peroxide, ammonium persulfate and potassium persulfate, and the reducing agent in the redox initiator is selected from the group consisting of sodium bisulfite and ascorbic acid.
The water absorption capacity and the water absorption speed of the manufactured water absorption material are tested, and the method specifically comprises the following steps:
1. water absorption capacity: after the same weight of the water-absorbent material was soaked in a liquid (distilled water or 0.9% physiological saline) for 10 minutes, the percentage of the total weight increase was the water absorption capacity of the water-absorbent material in (g/g).
2. Water absorption speed: the time taken for the same weight of the water-absorbent material to absorb 100g of liquid (distilled water or 0.9% physiological saline) was recorded as the water absorption rate in seconds.
Example 1
Respectively placing softwood pulp and hardwood pulp into a hydropulper for pulping, wherein the concentration of the pulping is 5 wt%, the pulping time is 15min, then placing the pulp subjected to pulping into a disc mill for pulping, and fibrillating fibers in the softwood pulp and the hardwood pulp, wherein the pulping power is 300kW in the pulping process, the throughput of the pulp in the pulping process is 2000L/min, and the pulping concentration is 4.0 wt%; conveying the ground pulp into a pulp mixing pool for pulp mixing, wherein the weight ratio of softwood pulp to hardwood pulp is 30:70, and a polyamide polyepichlorohydrin resin wet strength agent and a hydrophilic organic silicon softening agent are simultaneously added in the pulp mixing process to obtain surface pulp and bottom pulp; then, conveying the surface slurry and the bottom slurry through a flow box to be screened, wherein the screening concentration of the surface slurry and the bottom slurry is 0.7 wt%, gradually forming the surface slurry and the bottom slurry dehydrated by a screen part to respectively obtain wet surface layer paper and wet bottom layer paper, the relative water content of the wet surface layer paper and the wet bottom layer paper is 60%, respectively spraying the wet surface layer paper and the wet bottom layer paper with high molecular water-absorbent resin, and simultaneously instantly compounding the wet surface layer paper and the wet bottom layer paper which are respectively sprayed with high molecular water-absorbent resin to obtain wet paper sheets; finally, the wet paper is directly pressed and dehydrated, the pressed and dehydrated paper is placed in a drying cylinder for further drying and dehydration, and the water absorption material with the surface layer, the high molecular water absorption resin and the bottom layer completely compounded into a whole is obtained, and the relative water content of the water absorption material is 7%; and finally, sequentially coiling, cutting and packaging the prepared water absorbing material.
The macromolecular water-absorbing resin comprises the following main raw materials:
according to parts by weight, 200 parts of acrylic acid, 200 parts of a 48 wt% sodium hydroxide solution, 400 parts of polyethylene glycol, 6 parts of diacrylate, 300 parts of deionized water, 1 part of redox initiator, 30 parts of ethanol, 10 parts of glycerol, 4 parts of surface treatment liquid and 3 parts of silicon dioxide.
The preparation process comprises the following steps:
mixing acrylic acid, water, polyethylene glycol and diacrylate, introducing nitrogen to remove oxygen for 30min to keep the oxygen content within 1ppm, adding a redox initiator (the oxidant is ammonium persulfate and the reducing agent is ascorbic acid) at 10 ℃ to initiate polymerization, and naturally heating the polymerization to make the peak value of the natural heating to be 85 ℃; then preserving heat for 1 hour at the temperature of 85 ℃ to obtain polymeric colloid, and granulating the polymeric colloid to obtain resin particles; then, neutralizing the resin particles with 48 wt% sodium hydroxide solution until the pH value is 6.5, spraying a surface treatment solution (prepared by mixing 2 parts by weight of 1, 4-butanediol diglycidyl ether and 2 parts by weight of deionized water) to perform surface treatment, drying at 120 ℃, and crushing to obtain water-absorbent resin particles; and finally, mixing and stirring the obtained water-absorbent resin particles with ethanol and glycerol uniformly, adding silicon dioxide, continuously stirring uniformly, and finally drying at 120 ℃ to obtain the high-molecular water-absorbent resin.
Example 2
Example 2 was carried out in substantially the same manner as in example 1, except that:
the weight ratio of softwood pulp to hardwood pulp was 20: 80.
Example 3
Example 3 was carried out in substantially the same manner as in example 1, except that:
the weight ratio of softwood pulp to hardwood pulp was 40: 60.
Example 4
Example 4 was carried out in substantially the same manner as in example 1, except that:
the main raw materials of the high-molecular water-absorbing resin have different dosages: the composition comprises, by weight, 100 parts of acrylic acid, 100 parts of a 48 wt% sodium hydroxide solution, 400 parts of polyethylene glycol, 5 parts of diacrylate, 100 parts of deionized water, 0.5 part of a redox initiator, 20 parts of ethanol, 1 part of glycerol, 2 parts of a surface treatment solution and 2 parts of silicon dioxide.
Example 5
Example 5 was carried out in substantially the same manner as in example 1, except that:
the main raw materials of the high-molecular water-absorbing resin have different dosages: according to parts by weight, acrylic acid 300, 50 wt% sodium hydroxide solution 300, polyethylene glycol 400, diacrylate 10, deionized water 700, redox initiator 2, ethanol 50, glycerol 10, surface treatment liquid 6 and silicon dioxide 5.
Example 6
Example 6 was carried out in substantially the same manner as in example 1, except that:
the high molecular water-absorbing resin in example 6 is a hydrolyzed starch-acrylonitrile medium copolymer.
Comparative example 1
Comparative example 1 was conducted in substantially the same manner as in example 1, and the water-absorbent polymer resin used was the same as that of example 1 except that:
after wet surface layer paper and wet bottom layer paper are obtained, drying the wet surface layer paper and the wet bottom layer paper respectively, spraying glue on the lower surface of the dried surface layer paper and the upper surface of the dried bottom layer paper by using a glue spraying machine respectively, uniformly spraying high-molecular water-absorbing resin on the lower surface of the surface layer paper and the upper surface of the bottom layer paper, compounding the lower surface of the surface layer paper sprayed with the high-molecular water-absorbing resin and the upper surface of the bottom layer paper respectively to obtain paper sheets, placing the paper sheets in a drying cylinder for further drying and dehydrating to obtain a water-absorbing material, wherein the relative water content of the water-absorbing material is 7%; and finally, sequentially coiling, cutting and packaging the prepared water absorbing material.
Comparative example 2
Comparative example 2 was conducted in substantially the same manner as comparative example 1 except that:
the high molecular water-absorbing resin in comparative example 2 is a hydrolyzed starch-acrylonitrile medium copolymer.
The water absorption capacity and the water absorption rate of the water-absorbent materials of examples 1 to 6 and comparative examples 1 to 2 are shown in Table 1.
Table 1: the water absorption capacity and the water absorption rate of the water-absorbent materials of examples 1 to 6 and comparative examples 1 to 2.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for manufacturing a water absorbing material, which is characterized by comprising the following steps:
(1) respectively carrying out net-feeding molding on the surface sizing agent and the bottom sizing agent to obtain wet surface paper and wet bottom paper; the relative water content of the wet surface layer paper and the wet bottom layer paper is 50-80%; the method also comprises the steps of respectively pulping and grinding the raw materials of the surface sizing agent and the bottom sizing agent before the step (1), and then preparing the pulp to respectively obtain the surface sizing agent and the bottom sizing agent; the raw materials of the surface sizing agent and/or the bottom sizing agent consist of softwood pulp and hardwood pulp, and the weight ratio of the softwood pulp to the hardwood pulp is (20-30): (70-80);
(2) respectively spraying the wet surface layer paper and the wet bottom layer paper prepared in the step (1) with high molecular water-absorbing resin, and compounding the wet surface layer paper and the wet bottom layer paper respectively sprayed with the high molecular water-absorbing resin to prepare wet paper sheets;
(3) sequentially squeezing and drying the wet paper pages prepared in the step (2) to prepare a water absorbing material;
the macromolecular water-absorbing resin comprises the following raw materials: acrylic acid, 48-50 wt% sodium hydroxide solution, polyethylene glycol, diacrylate, water, an initiator, ethanol, glycerol, a surface treatment fluid and silicon dioxide, and the preparation process comprises the following steps:
(a) mixing acrylic acid, water, polyethylene glycol and diacrylate, introducing nitrogen to remove oxygen, adding an initiator to initiate polymerization reaction, and naturally heating the polymerization reaction;
(b) regarding that the temperature of the polymerization reaction in the step (a) does not rise any more as the reaction is finished, after the reaction is finished, preserving the heat at the temperature of 80-90 ℃ to obtain polymer colloid, and granulating the polymer colloid to obtain resin particles;
(c) neutralizing the resin particles obtained in the step (b) with a sodium hydroxide solution until the pH value is 6.0-6.5, then spraying a surface treatment solution for surface treatment, and drying and crushing the resin particles in sequence to obtain water-absorbent resin particles;
(d) and (c) mixing and stirring the water-absorbent resin particles obtained in the step (c) with ethanol and glycerol uniformly, adding silicon dioxide, continuously stirring uniformly, and finally drying to obtain the high-molecular water-absorbent resin.
2. The method according to claim 1, wherein the method further comprises the step of sequentially winding, slitting and packaging the water-absorbent material obtained in the step (3).
3. The method of claim 1, wherein:
the concentration of the crushed pulp is 4-6 wt%;
the pulping time is 10-20 min;
the grinding power of the grinding is 280-360 kW;
the passing amount of the pulp in the pulping process is 1800-2100L/min;
the concentration of the ground pulp is 3.8-4.2 wt%;
an additive is added in the pulp preparation process, and the additive is selected from the group consisting of a wet strength agent and a softening agent.
4. The method of claim 1, wherein:
the concentration of the net surfing in the step (1) is 0.6-0.8 wt%;
the gram weight of the wet surface layer paper prepared in the step (1) after being dried is 20-50g/m2The gram weight of the wet bottom layer paper after being dried is 20-60g/m2；
The spraying amount of the high molecular water-absorbing resin of the wet surface layer paper and/or the wet bottom layer paper in the step (2) is 35-60g/m2；
The relative water content of the water absorbing material prepared in the step (3) is 6-8%.
5. The method according to claim 1, wherein the amount of the raw materials of the high-molecular water-absorbent resin is as follows: according to the parts by weight, 100-300 parts of acrylic acid, 100-300 parts of sodium hydroxide solution with the concentration of 48-50 wt%, 400 parts of polyethylene glycol, 5-10 parts of diacrylate, 100 parts of water, 700 parts of initiator, 0.5-2 parts of ethanol, 20-50 parts of glycerol, 2-6 parts of surface treatment liquid and 2-5 parts of silicon dioxide;
the surface treatment liquid comprises 1, 4-butanediol diglycidyl ether and water, and the weight ratio of the 1, 4-butanediol diglycidyl ether to the water is 1: 1.
6. The method of claim 1, wherein:
after nitrogen is introduced to remove oxygen in the step (a), the oxygen content is within 1 ppm;
introducing nitrogen to remove oxygen in the step (a), and adding an initiator at the temperature of 5-10 ℃;
the peak value of the natural temperature rise in the step (a) is between 85 and 90 ℃;
the heat preservation time in the step (b) is 0.5 to 1.5 hours;
the temperature of the drying in the step (c) and/or the step (d) is 110-130 ℃.
7. The method of claim 1 or 5 or 6, wherein:
the initiator is a redox initiator;
the oxidizing agent in the redox initiator is selected from the group consisting of hydrogen peroxide, ammonium persulfate and potassium persulfate, and the reducing agent in the redox initiator is selected from the group consisting of sodium bisulfite and ascorbic acid.
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| CN111705541B (en) * | 2019-11-20 | 2022-05-17 | 山东诺尔生物科技有限公司 | Soft and dry absorption material, manufacturing method and application |
| CN111021141A (en) * | 2019-12-18 | 2020-04-17 | 福建恒安集团有限公司 | Water-absorbent paper and preparation method thereof |
| CN113718546A (en) * | 2020-05-25 | 2021-11-30 | 杭州特种纸业有限公司 | Silicon dioxide air filter paper and preparation method thereof |
| CN111945447B (en) * | 2020-07-01 | 2021-04-02 | 杭州成宏卫生用品有限公司 | Water-absorbent paper based on polyacrylic acid type high water-absorbent composite resin and preparation method thereof |
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| CN1410613A (en) * | 2002-11-28 | 2003-04-16 | 谢道训 | Super water absorbing pumace gas flow netting non-woven cloth and its manufacturing process |
| CN102702656A (en) * | 2012-07-05 | 2012-10-03 | 东营市诺尔化工有限责任公司 | Preparation method of high liquid permeability water-absorbing resin |
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| CN2225487Y (en) * | 1995-06-30 | 1996-04-24 | 香港独资重庆永银化工发展有限公司 | High molecular water absorption composite paper |
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| CN1410613A (en) * | 2002-11-28 | 2003-04-16 | 谢道训 | Super water absorbing pumace gas flow netting non-woven cloth and its manufacturing process |
| CN102702656A (en) * | 2012-07-05 | 2012-10-03 | 东营市诺尔化工有限责任公司 | Preparation method of high liquid permeability water-absorbing resin |
| CN104448155A (en) * | 2014-11-19 | 2015-03-25 | 山东诺尔生物科技有限公司 | Preparation method of high-diffusivity water-absorbent resin |
| CN105926364A (en) * | 2016-05-18 | 2016-09-07 | 武汉力诚生物科技有限公司 | Liquid-absorption moisture proof paper and preparation method |
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