CN110861385A - High water-absorbing and oil-absorbing material and preparation method of paper pulp fiber thereof - Google Patents

High water-absorbing and oil-absorbing material and preparation method of paper pulp fiber thereof Download PDF

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CN110861385A
CN110861385A CN201911163366.XA CN201911163366A CN110861385A CN 110861385 A CN110861385 A CN 110861385A CN 201911163366 A CN201911163366 A CN 201911163366A CN 110861385 A CN110861385 A CN 110861385A
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pulp
fiber layer
parts
pulp fiber
paper pulp
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CN110861385B (en
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钟凯杰
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/02—Methods of beating; Beaters of the Hollander type
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
    • 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
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • B32B2038/168—Removing solvent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/26—All layers being made of paper or paperboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins

Abstract

The invention provides a material with high water absorption and oil absorption, which comprises a first paper pulp fiber layer and a second paper pulp fiber layer, wherein SAP resin powder is extruded and embedded between the first paper pulp fiber layer and the second paper pulp fiber layer, the first paper pulp fiber layer and the second paper pulp fiber layer with the dryness of 10-50% are selected and extruded and compounded in an extrusion roller, and the SAP is embedded into the first paper pulp fiber layer and the second paper pulp fiber layer, so that the water absorption property and the oil absorption property of the material are improved, and the application prospect of the material can be expanded. Meanwhile, the improvement on the pulp fiber further improves the water absorption and oil absorption effects of the material.

Description

High water-absorbing and oil-absorbing material and preparation method of paper pulp fiber thereof
Technical Field
The invention relates to the technical field of papermaking production, in particular to a material with high water absorption and oil absorption and a preparation method of paper pulp fibers thereof
Background
Referring to fig. 3, a drying material currently marketed is composed of a first pulp fiber layer 201 and a second pulp fiber layer 202, and SAP resin 100 is bonded between the first pulp fiber layer and the second pulp fiber layer through glue 400, and the preparation process of the drying material is that the first pulp fiber layer and the second pulp fiber layer with the dryness of more than 90% are evenly coated with glue, and then SAP resin particles are arranged, and then the drying material is composed, and the drying material has the following defects: 1. the SAP resin particles bonded by the glue are sealed or blocked by the glue during gluing, so that the water absorption or oil absorption effect of the SAP resin is greatly reduced; 2. the bonding of glue can lead to SAP resin powder waste in the course of working, and SAP resin powder flies upward during cutting especially, has caused the influence of processing environment when wasting raw materials, 3, SAP resin material can also scatter in a large number and just produce unnecessary trouble to the consumer in the use.
The removal of stains or oil stains is also a matter of increasing concern, and there is a need to improve the oil absorption properties of paper towels.
Super Absorbent Polymer (SAP) is a new functional Polymer material. Synthetic resins having hydrophilic groups, which can absorb a large amount of water and swell while retaining no outflow of water, such as starch-grafted acrylates, grafted acrylamides, highly substituted crosslinked carboxymethylcellulose, crosslinked carboxymethylcellulose-grafted acrylamide, crosslinked hydroxyethylcellulose-grafted acrylamide polymers, and the like, generally can absorb water in an amount of 100 times or more the volume of the resin, have a maximum water absorption of 1000 times or more, and are generally used as medical materials, such as diapers, sanitary napkins, and the like, and are also industrially used as plugging materials. However, the performance structure of diapers and sanitary napkins is different from that of daily used paper towels, and how to use SAP in paper towels to improve the water absorption performance of the paper towels needs to be optimized according to the composition of the paper towels.
Moreover, the oil absorption performance of the fiber can be improved by modifying the fiber by adopting a graft copolymerization method, for example, the oil absorption of the fiber can be improved by grafting and modifying fiber components by adopting substances of acrylate and vinyl by adopting a chemical grafting method; however, how to ensure good oil absorption rate and also to consider the water absorption characteristics of the paper towel when the modified fibers are used in the paper towel is a problem to be solved in the field.
In order to improve the water and oil absorption characteristics of the paper towel, the applicant cooperates with the Zhejiang university material and the textile college to complete the technical scheme of the application.
Disclosure of Invention
The invention provides a material with high water absorption and oil absorption and a preparation method of pulp fiber thereof, aiming at solving the problems in the prior art.
In one aspect, the present invention provides a material with high water and oil absorption, comprising a first pulp fiber layer and a second pulp fiber layer, wherein SAP resin powder is pressed and embedded between the first pulp fiber layer and the second pulp fiber layer, and the forming steps are as follows:
1) preparing materials: selecting a first paper pulp fiber layer and a second paper pulp fiber layer with the dryness of 10% -20%;
2) SAP powder feeding: uniformly coating SAP resin powder on a first paper pulp fiber layer with the dryness of 10% -20%;
3) and paper covering: covering a second paper pulp fiber layer with the dryness of 10% -20% on the basis of the step;
4) and extruding: extruding and compounding the material in the extruding roller in the step 3, and embedding the SAP into the first paper pulp fiber layer and the second paper pulp fiber layer;
5) and drying: and (5) drying and forming the extruded and compounded material.
According to the technical scheme, the wet pulp fibers with the dryness of 10% -20% are compounded, and the dry pulp fibers are difficult to extrude and embed the SAP resin powder into the pulp fibers, so that the compounding effect cannot be achieved. The pulp fiber can be selected from pulp fibers which are relatively universal in the market, but in order to ensure the composite effect and the product quality, the strength and the adhesion of the pulp fiber need to be ensured and the water seepage effect of the pulp fiber also needs to be ensured under the consideration of the fact that the pulp fiber is compounded under a certain humidity, so that the pulp fiber layer is designed according to the technical scheme, and comprises pulp, a wet strength agent, a starch grafted acrylamide polymer and acetic anhydride modified kapok fiber.
In one embodiment, the pulp is made of one or any of bamboo fiber wood pulp, softwood pulp, hardwood pulp; preferably, the pulp is prepared from softwood pulp and hardwood pulp.
The paper pulp can be prepared by the following steps of pulping raw materials by a pulper, removing slag, roughly screening, removing impurities and concentrating to obtain wood pulp; adding water into wood pulp in a pulper to adjust the concentration of the wood pulp to be 3-10 wt%, pulping for 10 minutes, defibering fibers of the obtained pulped matter by a defibering machine, and pulping by a pulping machine to obtain the paper pulp.
In one embodiment, the wet strength agent is a PAE resin (polyamide epichlorohydrin resin).
The starch graft acrylamide polymer of the present invention may be a commercial product available in the art, or may be prepared by a method conventional in the art. In one embodiment, the starch grafted acrylamide polymer of the present invention may be prepared by: gelatinizing starch, cooling, adding acrylamide and water, filling nitrogen, adding an initiator and a cross-linking agent, stirring for reacting for a period of time, hydrolyzing and saponifying, extracting the obtained product by using an organic solvent, washing with water, and drying to obtain the starch grafted acrylamide polymer.
In one embodiment, the initiator is ammonium persulfate and the N, N-methylenebisacrylamide is the crosslinker.
The acetic anhydride modified kapok fiber can be a commercial product sold in the field, and can also be prepared by a method conventional in the field. In one embodiment, the acetic anhydride modified kapok fiber of the present invention can be prepared by: adding the kapok fiber into a sodium chlorite solution, adjusting the pH value to 4-5 by using acetic acid, treating for 1-4 hours at the temperature of 60-80 ℃, washing with water, and drying to obtain pretreated kapok fiber; shearing the pretreated kapok fiber into a length of 1-20mm, adding acetic anhydride and 4-dimethylaminopyridine, condensing and refluxing for 4-10 hours at 70-90 ℃, filtering out the fiber after the reaction is finished, washing with ethanol to remove unreacted reagents and byproducts, and drying to obtain the acetic anhydride modified kapok fiber.
Further, the pulp fiber layer comprises 50-90 parts by weight of pulp, preferably 80 parts by weight of pulp; 1-5 parts of wet strength agent, preferably 3 parts; 1-10 parts of starch grafted acrylamide polymer, preferably 7 parts; 5-15 parts of acetic anhydride modified kapok fiber, preferably 10 parts.
Preferably, the paper pulp is prepared from softwood pulp and hardwood pulp, and the dosage ratio of the softwood pulp to the hardwood pulp is 1: 1.
The softwood pulp is preferably larch wood pulp, and the hardwood pulp is preferably poplar wood pulp.
On the other hand, the invention also provides application of the material in preparing a water-absorbing and oil-absorbing tissue.
In another aspect, the present invention also provides a method for preparing a pulp fiber layer, comprising the steps of: (1) preparing paper pulp from wood pulp; preferably, the wood pulp is one or more of bamboo fiber wood pulp, softwood pulp and hardwood pulp, and more preferably, the wood pulp is softwood pulp and hardwood pulp; (2) mixing paper pulp, a wet strength agent, a starch grafted acrylamide polymer and an acetic anhydride modified kapok fiber, and pulping to prepare pulp; (3) and adding the pulp into a paper machine, and forming, pressing and drying to obtain the pulp fiber layer.
Preferably, a step of removing larger undissolved solids or fibers in the slurry is also included before steps (2) and (3).
Preferably, the pulp fed to the paper machine in step (3) has a concentration of 1 to 3% by weight.
According to the invention, the composite structure of the SAP resin particles of the material is optimally matched with the extrusion embedding process, so that the water absorption property and the oil absorption property of the material are improved, and the application prospect of the tissue can be expanded. Meanwhile, the improvement of the pulp fiber further improves the water absorption and oil absorption effects of the material.
Drawings
FIG. 1 is a schematic structural section of a high water and oil absorption material of the present invention;
FIG. 2 is a schematic view of extrusion molding of SAP resin particles of the present invention;
fig. 3 is a structural sectional view of a prior art material in the background art.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, and the present invention is not limited to the following embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept, and the scope of the appended claims is intended to be protected. The procedures, conditions, reagents, experimental methods and the like for carrying out the present invention are general knowledge and common general knowledge in the art except for the contents specifically mentioned below, and the present invention is not particularly limited.
In addition, most of the experiments related to the present embodiment are performed at the institute of materials and textiles, university of Zhejiang science and technology, and are described here.
A high water and oil absorbent material comprises a first pulp fiber layer 201 and a second pulp fiber layer 202, wherein SAP resin powder 100 is pressed and embedded between the first pulp fiber layer 201 and the second pulp fiber layer 202, and the molding steps are as follows:
1) preparing materials: selecting a first pulp fiber layer 201 and a second pulp fiber layer 202 with 17% dryness;
2) SAP powder feeding: by uniformly coating the SAP resin powder 100 on the first pulp fiber layer 201 with the dryness of 17%;
3) paper covering: coating a second pulp fiber layer 202 with the dryness of 17 percent on the basis of the step 2;
4) and extruding: performing extrusion compounding in the material extrusion roll 300 of the step 3, and embedding the SAP into the first pulp fiber layer 201 and the second pulp fiber layer 202;
5) and drying: and (5) drying and forming the extruded and compounded material.
In this embodiment, softwood pulp and hardwood pulp are used for preparing the pulp, and the preparation method of the pulp is as follows: the method comprises the steps of mixing softwood pulp and hardwood pulp according to the ratio of 1:1 to obtain mixed wood pulp, adding water into the mixed wood pulp in a pulper to adjust the wood pulp concentration to be 3-10 wt%, performing defibering for 10 minutes, defibering fibers of the obtained pulped matter through a defibering machine, and pulping through a beater to obtain the paper pulp.
In the embodiment, a polyvinyl alcohol-acrylate graft copolymer, a starch graft acrylamide polymer and a starch graft styrene sulfonic acid polymer are added into the pulp to improve the water absorption of the pulp fiber layer.
In the implementation, the acetic anhydride modified kapok fiber, the styrene modified kapok fiber and the butyl methacrylate modified kapok fiber are added into the paper pulp to improve the oil absorption of the paper pulp fiber layer.
In the embodiment, the wet strength agent adopted for papermaking is polyamide epichlorohydrin resin.
The above components may be selected from commercially available products in the art, or may be prepared by a method conventional in the art.
In this embodiment, the starch graft polymer may be prepared by gelatinizing starch, cooling, adding acrylamide or styrenesulfonic acid monomer, charging nitrogen, adding initiator and cross-linking agent, stirring for a certain period of time, hydrolyzing and saponifying, extracting the obtained product with an organic solvent, washing with water, and drying to obtain the starch graft polymer.
The modified kapok fiber in the implementation can be prepared by adding the kapok fiber into a sodium chlorite solution, adjusting the pH value to 4.5 by using acetic acid, treating for 1 hour at 70 ℃, washing with water and drying to obtain the pretreated kapok fiber; the method comprises the following steps of shearing the pretreated kapok fiber into a length of about 5mm, and adding acetic anhydride, styrene or butyl methacrylate to carry out surface modification on the pretreated kapok fiber to obtain the modified kapok fiber.
The preparation method of the pulp fiber layer can be prepared by adopting the conventional papermaking process in the field, and specifically, in practical operation, after the pulp is prepared, the pulp, the wet strength agent, the water absorption composition or the oil absorption composition are mixed, and the pulp fiber layer can be prepared by adopting the conventional process in a papermaking machine.
In a general embodiment, the papermaking process comprises the following steps in the order of production: pulping, molding, surfing, feeding, compounding, drying, rolling and slitting.
According to the method, softwood pulp and hardwood pulp are mixed according to the weight ratio of 1:1 to obtain mixed wood pulp, and the mixed wood pulp is used for preparing the paper pulp; the softwood pulp is selected from larch pulp and the hardwood pulp is selected from poplar pulp.
The paper pulp fiber layer is prepared by adopting 80 parts of paper pulp, 3 parts of wet strength agent, 7 parts of water absorption composition and 10 parts of oil absorption composition according to the conventional paper making method.
For the detection of the water absorption of the paper pulp fiber layer, the standard GB/T1540-1989 can be adopted for detection; for the detection of the oil absorption of the pulp fiber layer, the following method can be adopted: cutting the paper sample into round pieces with quantitative determination standard sample sampler, weighing, soaking the sample under oil surface, and determining the weight increase in g/m after absorbing oil for 15min2The test temperature is room temperature, and the test oil is kitchen oil.
Examples 1-4 Water absorbency testing of pulp fiber layers
The water absorption of the pulp fiber layer was tested using polyvinyl alcohol-acrylate graft copolymer, starch graft acrylamide polymer, and starch graft styrene sulfonic acid polymer added to the pulp. The preparation conditions and the water absorption test results of the pulp fiber layers in examples 1 to 4 are shown in the following table:
table 1 examples 1-4 test results of water absorption properties of pulp fiber layer
Figure BDA0002286743670000061
As shown in table 1, although the polyvinyl alcohol-acrylate graft copolymer, the starch graft acrylamide polymer, and the starch graft styrene sulfonic acid polymer are water-absorbent resins commonly used in the art, they show different effects of increasing water absorption when used in combination with a pulp fiber layer; in particular, starch grafted acrylamide polymers and starch grafted styrene sulfonic acid polymers, both of which are starch grafted copolymers, have different water absorption effects when they are finally used in a pulp fiber layer due to the difference in polymerized monomers. This is probably because the components of softwood pulp and hardwood pulp in the pulp fiber layer and the wet strength agent (polyamide epichlorohydrin resin) act on the water-absorbent resin, and the water-absorbent effect exerted by the water-absorbent resin is affected.
In the previous test, if the polyamide epichlorohydrin resin is not added into the pulp, only the water-absorbing composition is added, and the improvement amount of the polyvinyl alcohol-acrylate graft copolymer, the starch graft acrylamide polymer or the starch graft styrene sulfonic acid polymer on the water absorption of the pulp fiber layer is not much different and is about 85 percent; however, if the wet strength agent polyamide epichlorohydrin resin is not added, the overall performance of the pulp fiber layer, such as wet strength and tensile strength of paper, can be affected. Comprehensively, the polyamide epichlorohydrin resin is added into the pulp. In the above three water-absorbent compositions, the addition of the starch graft acrylamide polymer exhibits an excellent water-absorption-improving effect.
Examples 5-7 oil absorption test of pulp fiber layer
The modified kapok fiber can obviously improve the oil absorption performance, and in order to improve the oil absorption performance of the pulp fiber layer, the modified kapok fiber is added into the pulp fiber layer with improved water absorption so as to improve the oil absorption efficiency of the pulp fiber layer.
Considering the results of examples 1-4, that different water absorbing compositions exhibited different water absorption enhancing effects when compounded with pulp and wet strength agents, examples 5-7 used different monomer modified kapok fibers (acetic anhydride modified kapok fiber, styrene modified kapok fiber, and butyl methacrylate modified kapok fiber) to explore the best oil absorption enhancing materials, as shown in table 2.
Table 2 examples 5-7 paper pulp fiber layer water and oil absorption test results
Figure BDA0002286743670000071
As shown in table 2, after the acetic anhydride modified kapok fiber, the styrene modified kapok fiber and the butyl methacrylate modified kapok fiber are added into the paper pulp, the oil absorption performance of the paper pulp fiber layer can be remarkably improved, and the oil absorption capacity can be improved by about 5 times. In addition, example 3, in which only the water absorbent composition was added, had little influence on the oil absorption performance of the pulp fiber layer.
It can also be seen from table 2 that the addition of different modified kapok fibers, although significantly improving the oil absorption performance. However, at the same time, the water absorption properties of the pulp fiber layer are affected to some extent. In particular, the acetic anhydride modified kapok fiber has no obvious inhibition on the water absorption capacity of the pulp fiber layer; however, the addition of the styrene-modified kapok fiber and the butyl methacrylate-modified kapok fiber shows different inhibiting effects on the water absorption performance of the pulp fiber layer. This is probably because the styrene-modified kapok fiber and the butyl methacrylate-modified kapok fiber, although both of them improved the oil absorption performance, compared with the acetic anhydride-modified kapok fiber. However, due to the difference of chemical properties, a certain antagonistic effect may be exerted on the water absorption performance of the starch grafted acrylamide polymer, thereby affecting the water absorption effect of the starch grafted acrylamide polymer in the pulp fiber layer.
The invention has been described in detail with respect to a general description and specific embodiments thereof, but it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. A high water and oil absorption material is characterized by comprising a first pulp fiber layer and a second pulp fiber layer, wherein SAP resin powder is pressed and embedded between the first pulp fiber layer and the second pulp fiber layer, and the molding steps are as follows:
1) preparing materials: selecting a first paper pulp fiber layer and a second paper pulp fiber layer with the dryness of 10% -20%;
2) SAP powder feeding: evenly coating SAP resin powder on a first paper pulp fiber layer with dryness of 10% -20%;
3) and paper covering: on the basis of the step 2), covering a second paper pulp fiber layer with the dryness of 10% -20% on the SAP resin powder;
4) and extruding: extruding and compounding the material in the extruding roller in the step 3), and embedding the SAP into the first paper pulp fiber layer and the second paper pulp fiber layer;
5) and drying: drying and forming the extruded and compounded material in the step 4).
2. The material with high water and oil absorption as claimed in claim 1, wherein the materials of the first and second pulp fiber layers comprise pulp, wet strength agent, starch graft acrylamide polymer and acetic anhydride modified kapok fiber, and the composition comprises: 50-90 parts of paper pulp by weight; 1-5 parts of a wet strength agent; 1-10 parts of starch grafted acrylamide polymer; 5-15 parts of acetic anhydride modified kapok fiber.
3. The material of claim 2, wherein the pulp comprises 80 parts by weight; 3 parts of a wet strength agent; 7 parts of starch grafted acrylamide polymer; 10 parts of acetic anhydride modified kapok fiber.
4. The material as claimed in claim 3, wherein the wet strength agent is selected from polyamide epichlorohydrin resins, and the pulp is prepared from softwood pulp and hardwood pulp.
5. The material with high water absorption and oil absorption as claimed in claim 3, wherein the starch grafted acrylamide polymer is prepared by the following steps: gelatinizing starch, cooling, adding acrylamide and water, filling nitrogen, adding an initiator and a cross-linking agent, stirring for reaction, hydrolyzing and saponifying, extracting the obtained product by using an organic solvent, washing with water, and drying to obtain the starch grafted acrylamide polymer.
6. The material with high water absorption and oil absorption as claimed in claim 1, wherein the kapok fiber modified by acetic anhydride is prepared by the following steps: adding the kapok fiber into a sodium chlorite solution, adjusting the pH value to 4-5 by using acetic acid, treating for 1-4 hours at the temperature of 60-80 ℃, washing with water, and drying to obtain pretreated kapok fiber; shearing the pretreated kapok fiber into a length of 1-20mm, adding acetic anhydride and 4-dimethylaminopyridine, condensing and refluxing for 4-10 hours at 70-90 ℃, filtering out the fiber after the reaction is finished, washing with ethanol to remove unreacted reagents and byproducts, and drying to obtain the acetic anhydride modified kapok fiber.
7. Use of the material of any of claims 1-6 in the preparation of a water-absorbent oil-absorbing tissue.
8. A method for producing a pulp fibre layer, characterised in that the method comprises the steps of: (1) preparing paper pulp from wood pulp; (2) mixing paper pulp, a wet strength agent, a starch grafted acrylamide polymer and an acetic anhydride modified kapok fiber, and pulping to prepare pulp; (3) adding the pulp into a paper machine, and forming, pressing and drying to obtain the paper pulp fiber layer;
in the step (2), 50-90 parts of paper pulp by weight; 1-5 parts of a wet strength agent; 1-10 parts of starch grafted acrylamide polymer; 5-15 parts of acetic anhydride modified kapok fiber;
the wet strength agent is polyamide epichlorohydrin resin.
9. The production method according to claim 8, wherein in the step (2), 80 parts by weight of pulp; 3 parts of a wet strength agent; 7 parts of starch grafted acrylamide polymer; 10 parts of acetic anhydride modified kapok fiber.
10. The method of claim 8, wherein the wood pulp comprises softwood pulp and hardwood pulp.
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EP1156147A1 (en) * 2000-05-17 2001-11-21 Kang Na Hsiung Enterprise Co. Ltd. Non-woven composite fabric
JP5133474B2 (en) * 2000-10-11 2013-01-30 大王製紙株式会社 Multifunctional multilayer absorber and method for producing the same
WO2005041815A2 (en) * 2003-10-21 2005-05-12 Rayonier Products And Financial Services Company Composite absorbent structures with nonwoven substrates with improved lamination integrity
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