WO2021120987A1 - 一种吸水纸及其制备方法 - Google Patents

一种吸水纸及其制备方法 Download PDF

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WO2021120987A1
WO2021120987A1 PCT/CN2020/130707 CN2020130707W WO2021120987A1 WO 2021120987 A1 WO2021120987 A1 WO 2021120987A1 CN 2020130707 W CN2020130707 W CN 2020130707W WO 2021120987 A1 WO2021120987 A1 WO 2021120987A1
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fiber layer
paper
paper fiber
ion exchange
layer
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PCT/CN2020/130707
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English (en)
French (fr)
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黄翠玉
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福建恒安集团有限公司
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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • D21H27/004—Tissue paper; Absorbent paper characterised by specific parameters
    • D21H27/005—Tissue paper; Absorbent paper characterised by specific parameters relating to physical or mechanical properties, e.g. tensile strength, stretch, softness
    • D21H27/007—Tissue paper; Absorbent paper characterised by specific parameters relating to physical or mechanical properties, e.g. tensile strength, stretch, softness relating to absorbency, e.g. amount or rate of water absorption, optionally in combination with other parameters relating to physical or mechanical properties
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/10—Phosphorus-containing compounds
    • 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
    • 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
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants

Definitions

  • the invention relates to the field of sanitary products, in particular to a absorbent paper and a preparation method thereof.
  • absorbent paper is usually made of pure wood pulp fibers.
  • the traditional preparation process is generally: using wood pulp fibers as raw materials, beating, pulping, papermaking on the Internet, dewatering, drying Drying, reeling, and slitting.
  • the absorbent paper produced by this method is generally thicker, has poor flexibility, less water absorption, and has no water-locking ability.
  • Chinese Patent No. 201610868931.2 discloses a preparation process of pure wood pulp fine-grain absorbent paper, which includes the following steps: (1) Mixing 50% Beimu and 50% Rainbow Fish into pulp, and then dissolving the pulp by a disintegrator and disc milling.
  • the beating degree is controlled at 23 ⁇ 3 degrees, and the wet weight is 19 ⁇ 1g;
  • the beating pulp is stored in the pulping tank for pulping, and the dry strength agent is added to the pulping time limit, and the amount is 5-15kg/t paper ; Then add wet strength agent, the amount of 40-50kg/t paper; finally add softener, the amount of 5-15kg/t paper;
  • pump the above prepared slurry to the flow system, after dilution, screening Then it is diluted to 0.04% concentration by the secondary flushing pump to the weight of the isobaric pulper, and then dehydrated and formed by the inclined wire machine type;
  • the formed wet paper is pressed and dried in a large cylinder.
  • the wrinkling device When the dryness reaches 70-90%, the wrinkling device is used for wrinkling.
  • the wrinkled paper is then dried in a large cylinder, and finally rolled and slit to obtain the finished absorbent paper.
  • the press section The line pressure is controlled at 50-60 KN/m; the creping scraper adopts a ceramic fine-line scraper, the angle of the creping scraper blade holder of the creping device is 25°, and the angle of the ceramic scraper is 75°.
  • the absorbent paper obtained by the preparation process of this patent is relatively soft and not easy to shed hair, but its water absorption capacity is equivalent to that of the prior art and has not been improved.
  • Cipheral Patent Application No. 201610829337.2 discloses a composite absorbent paper, which includes an upper isolation layer, a high-top non-woven fabric and a lower isolation layer; an upper absorbent layer is provided between the upper isolation layer and the high-top non-woven fabric layer, and A lower absorption layer is arranged between the high-top non-woven fabric and the lower isolation layer; the upper absorption layer and the lower absorption layer each include a plurality of SAP absorption units distributed in an array, and gaps are arranged between the plurality of SAP absorption units distributed in an array unit.
  • the absorbent paper is added with SAP.
  • the absorbent paper has a larger water absorption capacity and has a certain water-locking capacity, but its structure is more complicated, and it is not disclosed how to prepare it.
  • the present invention provides an absorbent paper and a preparation method thereof, which solves the defects of the prior art absorbent papers of poor flexibility, thicker thickness, small water absorption and poor water-locking ability.
  • a method for preparing absorbent paper including the following processing steps:
  • Slurry preparation send the beaten slurry into a slurry tank for slurry preparation, add wet strength agent and alkyl phosphate weakly hydrophilic surfactant during slurry preparation, and the added amount of the wet strength agent is 55 ⁇ 60kg/t pulp, the added amount of the alkyl phosphate hydrophilic surfactant is 10-15kg/t pulp;
  • Papermaking on the Internet The pulp after mixing is put into the netting device for netting;
  • the first paper fiber layer and the second paper fiber layer are compounded: the first paper fiber layer obtained in step 1) is compounded online to the upper surface of the second paper fiber layer obtained in step 2), and Drying at 40-100°C;
  • a further improvement is that the ion exchange fiber is polyacrylonitrile fiber.
  • a further improvement is: after step 3) and before step 4), send the combined first layer of paper fiber layer and second layer of paper fiber layer to a set of hot pressing rollers for on-line hot pressing and hot pressing.
  • the temperature is controlled at 40-60°C.
  • polymer water-absorbing resin is polymer water-absorbing resin particles or polymer water-absorbing fibers.
  • a further improvement is that the added amount of the polymer water-absorbing resin is 50-70 wt% of the second paper fiber layer.
  • a further improvement is that the addition amount of the ion exchange fiber is 80-90% of the weight of the polymer water-absorbing resin.
  • the ion exchange fiber adding mechanism includes an ion exchange fiber storage tank, a hollow conveying pipe, an adsorption device, a discharging tower, a pressurizer, and a discharging pipe.
  • One end of the hollow conveying pipe is connected to the ion exchange fiber storage
  • the tank is connected, the other end is connected with the lowering tower, the adsorption device is arranged above the hollow conveying pipe, the pressurizer is arranged on the outer side wall of the lowering tower, and the lowering pipe is arranged below the lowering tower.
  • the discharge pipe is provided with an outlet.
  • a absorbent paper comprising a first paper fiber layer and a second paper fiber layer arranged on the lower surface thereof, the second paper fiber layer comprising a paper fiber layer, and the upper surface of the paper fiber layer is evenly distributed There is a high-molecular water-absorbing resin, which is fixed on the upper surface of the paper fiber layer by hot melt adhesive, and the high-molecular resin is covered with an ion exchange fiber layer.
  • a further improvement is that the first paper fiber layer and the second paper fiber layer are fixedly connected by thermocompression bonding.
  • the absorbent paper of the present invention is composed of a first paper fiber layer and a second paper fiber layer arranged on its lower surface.
  • the second paper fiber layer is evenly distributed with polymer water-absorbing resin and ion exchange fibers.
  • the ion exchange fiber can exchange monovalent and divalent metal ions, so that the absorption speed of polymer water-absorbing resin is accelerated, and the water absorption of polymer water-absorbing resin is increased, and the diffusibility and dryness of the material are improved.
  • the specific principle is: ion exchange Fibers absorb the monovalent and divalent ions in human excrement.
  • ions in excrement will inhibit the water absorption of polymer water-absorbing resin, and affect the water absorption speed and water capacity of polymer water-absorbing resin, and ion exchange fibers can remove these ions.
  • the ions are adsorbed to release the inhibitory effect on the polymer water-absorbing resin, so that the water absorption of the polymer water-absorbing resin is increased, and the water absorption speed is also accelerated.
  • the absorbent paper of the present invention is added with a polymer absorbent resin and ion exchange fibers, which has a larger water absorption capacity and a higher water-holding capacity.
  • the absorbent paper of the present invention is made by wet papermaking, which is different from the traditional dry papermaking.
  • the second layer of paper fiber layer is semi-dried with polymer absorbent resin and ion exchange fibers, and then combined with the dried first
  • the paper and fiber layers are combined and then dried.
  • the paper obtained by this process is thinner, less than 0.8mm thinner than the absorbent paper prepared by the traditional dry method, and has higher softness.
  • the operating principle of the ion exchange fiber mechanism of the present invention is similar to that of the polymer adding mechanism, and it can be replaced by a polymer adding mechanism without the need to develop new equipment.
  • the ion exchange fiber of the present invention is preferably polypropylene ion exchange fiber, and the fiber is a short fiber of 3-10mm.
  • the size of the fiber is small and can be smoothly applied to the polymer water-absorbing resin through the ion exchange mechanism.
  • the polymer absorbs water.
  • the resin is in the form of granules or fibers.
  • the ion exchange fibers are evenly distributed on the surface of the polymer water-absorbing resin through the outlet of the feed pipe. Because the paper fiber layer sprayed with the polymer water-absorbing resin underneath the ion exchange fiber is from The state of transmission movement, therefore, the ion exchange fibers will not be gathered together but will be uniformly dispersed on the surface of the polymer water-absorbing resin.
  • Fig. 1 is an exploded view of the structure of absorbent paper according to an embodiment of the present invention
  • Figure 2 is a process flow diagram of the preparation of absorbent paper in Example 1 of the present invention.
  • FIG. 3 is a schematic diagram of the structure of the ion exchange fiber adding mechanism in the first embodiment of the present invention.
  • an absorbent paper includes a first layer of paper fiber layer 1 and a second layer of paper fiber layer 2 arranged on the lower surface thereof, the first layer of paper fiber layer 1 and the second layer of paper fiber layer 2 passing
  • the second layer of paper fiber layer 2 includes a paper fiber layer 21.
  • the upper surface of the paper fiber layer 21 is evenly distributed with a polymer water-absorbing resin 22.
  • the polymer water-absorbing resin 22 is melted by heat.
  • the glue is fixed on the upper surface of the paper fiber layer 21, and the polymer resin 22 is covered with an ion exchange fiber layer 23.
  • the ion exchange fiber layer is sprinkled onto the polymer resin 22 by polyacrylonitrile ion exchange fibers through an ion exchange fiber adding mechanism, and the polyacrylonitrile ion exchange fibers are short fibers of 3-10 mm.
  • a method for preparing absorbent paper includes the following processing steps:
  • Slurry preparation send the beaten slurry into a slurry tank for slurry preparation, and add wet strength agent and alkyl phosphate weakly hydrophilic surfactant during slurry preparation.
  • the added amount of the wet strength agent is 55kg/ t pulp
  • the added amount of the alkyl phosphate hydrophilic surfactant is 10 kg/t pulp;
  • the polyacrylonitrile ion exchange fibers are distributed online to the upper layer of the polymer water-absorbing resin particles to obtain the second layer of paper fibers
  • the addition amount of the polymer water-absorbing resin is 50% of the weight of the second layer of paper fiber
  • the addition amount of the ion exchange fiber is 90% of the weight of the polymer water-absorbing resin
  • the ion exchange fiber addition mechanism includes ion The exchange fiber storage tank 3, the hollow conveying pipe 4, the adsorption device 5, the discharging tower 6, the pressurizer 7, and the discharging pipe 8.
  • One end of the hollow conveying pipe 4 is in communication with the ion exchange fiber storage tank 3, and the other end is connected with
  • the lowering tower 6 is connected, the adsorption device is arranged above the hollow conveying pipe, the pressurizer 7 is arranged on the outer side wall of the lowering tower 6, the lowering pipe 8 is arranged below the lowering tower 6, and the lowering The feed pipe 8 is provided with an outlet 81.
  • the ion exchange fibers are first cut into short fibers of 3-10mm, and then sent to the ion exchange fiber storage tank 3.
  • the short fibers in the ion exchange fiber storage tank 3 are absorbed by the adsorption device through the hollow pipe.
  • a pressurizer 7 is provided on the outer side wall of the lowering tower to pressurize the lowering tower 6 so that the short fibers in the lowering tower are smoothly transported to the feeding pipe and to the outlet 81 On the polymer water-absorbing resin particles;
  • first paper fiber layer and the second paper fiber layer are combined: the first paper fiber layer obtained in step 1) is compounded online to the upper surface of the second paper fiber layer obtained in step 2), and Drying at 40°C;
  • thermocompression bonding the combined first and second paper fiber layers are fed to a set of thermocompression rollers for online thermocompression bonding, and the temperature is controlled at 50°C during thermocompression processing;
  • Example 1 Compared with Example 1, this example has different parameters in the preparation process.
  • the beating degree of wood pulp in step 1) a is controlled at 35°, and the amount of wet strength agent added in step b is 60 kg/t.
  • Pulp the amount of alkyl phosphate hydrophilic surfactant added is 15kg/t pulp;
  • the drying temperature in step 3) is 80°C, and the temperature of the first layer of paper fiber layer and the second layer of paper fiber layer is hot-pressed
  • the polymer water-absorbing resin particles are replaced with polymer water-absorbing fibers;
  • the addition amount of polymer water-absorbing fibers is 60%wt of the second paper fiber layer, and the addition amount of ion exchange fibers is 90% of the weight of the polymer water-absorbing fibers.
  • the paper fiber layer added with polymer water-absorbing resin fibers is sprayed with a layer of hot-melt adhesive, and then the ionic fibers are applied to the polymer water-absorbing fibers, and the ion-exchange fibers are fixed on the polymer water-absorbing fibers by the hot melt adhesive.
  • the degree of beating in step a is controlled at 30-40°
  • the amount of wet strength agent added in step b is 55-60 kg/t pulp
  • the amount of alkyl phosphate hydrophilic surfactant added is 10-15 kg /t pulp
  • the composite drying temperature of the first paper fiber layer and the second paper fiber layer is carried out at 40-100°C; the composite first paper fiber layer and the second paper fiber layer are fed into a group
  • the hot-pressing roller performs online hot-pressing, and the temperature is controlled at 40-60°C during the hot-pressing process; the addition amount of the polymer water-absorbing resin is 50-70wt% of the second paper fiber layer; the addition of ion exchange fibers
  • the amount is 80-90% of the weight of the polymer water-absorbing resin.
  • the objectives of the present invention can be achieved within the above-mentioned parameter ranges.
  • the polyacrylonitrile ion exchange fiber, wet strength agent, and alkyl phosphate hydrophilic surfactant of the present invention can all be directly purchased from the market.
  • the adsorption device is an adsorption device that can generate negative pressure, and it is a known device in the prior art, and the pressurizer is also a known device, which will not be repeated here.

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Abstract

一种吸水纸及其制备方法，解决现有技术的吸水纸柔软性差、厚度较厚、吸水量小及锁水能力差的缺陷，包括第一层纸纤维层(1)和设置在其下表面的第二层纸纤维层(2)，所述第二层纸纤维层(2)包括纸纤维层(21)，所述纸纤维层(21)的上表面均布有高分子吸水树脂(22)，所述高分子吸水树脂(22)通过热熔胶固定在纸纤维层(21)的上表面，所述高分子树脂(22)上覆盖有离子交换纤维层(23)。

Description

一种吸水纸及其制备方法 技术领域
本发明涉及卫生用品领域，尤其涉及一种吸水纸及其制备方法。
背景技术
吸水纸作为一款常见的生活用纸，其通常是由纯木浆纤维制作而成，其传统的制备过程一般为：以木浆纤维为原料、打浆、配浆、上网抄纸、脱水、烘干、卷取、分切，采用这种方法制得的吸水纸厚度一般较厚，柔软性差，吸水量较少，且没有锁水能力。
中国专利号201610868931.2公开了一种纯木浆细纹吸水纸的制备工艺，包括以下步骤：(1)将北木50％和虹鱼50％混合碎浆，碎浆后经过疏解机疏解和盘磨打浆，打浆度控制在23±3度，湿重19±1g；(2)打浆后的浆料储存在成浆池内，进行配浆，配浆时限添加干强剂，用量5-15kg/t纸；然后再添加湿强剂，用量40-50kg/t纸；最后添加柔软剂，用量5-15kg/t纸；(3)将上述配好的浆料泵送到流送系统，经过稀释、筛选后再由二次冲浆泵稀释到0.04％的浓度打到等压布浆器重，然后再斜网纸机种脱水成型；(4)成型后的湿纸页再经过压榨和大缸烘干，干度达到70-90％时利用起皱装置进行起皱，起皱后的纸再经过大缸烘干，最后卷取、分切得到成品吸水纸，所述湿纸页在压榨时，压榨部线压力控制在50-60KN/m；所述的起皱刮刀采用陶瓷细纹刮刀，所述起皱装置的起皱刮刀刀架角度为25°，陶瓷刮刀角度为75°。采用该专利的制备工艺得到的吸水纸较为柔软，不容易掉毛，但是其吸水量也锁水能力与现有技术相当，没有进行改进。
中国专利申请号201610829337.2公开了一种复合吸水纸，包括上隔离层、高蓬无纺布和下隔离层；所述上隔离层和高蓬无纺布层之间设有上吸收层，所述高蓬无纺布和下隔离层之间设有下吸收层；所述上吸收层和下吸收层均包括若干阵列分布的 SAP吸收单元，所述若干阵列分布的SAP吸收单元之间设有间隙单元。该吸水纸中添加有sap，相比传统的吸水纸，吸水量较大一些且具备一定的锁水能力，但是其结构较为复杂，且没有公开具体如何制备。
发明内容
因此，针对以上内容，本发明提供一种吸水纸及其制备方法，解决现有技术的吸水纸柔软性差、厚度较厚、吸水量小及锁水能力差的缺陷。
为达到上述目的，本发明是通过以下技术方案实现的：一种吸水纸的制备方法，包括以下处理步骤：
1)第一层纸纤维层的制备：
a、以木浆纤维为原料，送入打浆池打浆，打浆度控制在30-40°；
b、配浆：将打浆后的浆料送入成浆池进行配浆，配浆时加入湿强剂和烷基磷酸盐弱亲水表面活性剂，所述湿强剂的加入量为55～60kg/t纸浆，所述烷基磷酸盐亲水表面活性剂的加入量为10～15kg/t纸浆；
c、上网抄纸:将配浆后的浆料进入成网装置进行成网；
d、脱水；
e、烘干；
2)第二层纸纤维层的制备：采用上述步骤a至d，制得半干状态的纸纤维层，在半干状态的纸纤维层上表面在线撒播高分子吸水树脂，再经过离子交换纤维添加机构，将离子交换纤维在线分布到高分子吸水树脂的上层，即得到第二层纸纤维层；
3)第一层纸纤维层和第二层纸纤维层复合：将步骤1)制得的第一层纸纤维层在线复合到步骤2)制得的第二层纸纤维层的上表面，并在40-100℃进行烘干；
4)成卷；
5)分切。
进一步的改进是：所述离子交换纤维为聚丙烯腈纤维。
进一步的改进是：在步骤3)之后步骤4)之前，将复合后的第一层纸纤维层和第二层纸纤维层送入一组热压合辊进行在线热压合，热压合处理时温度控制在40-60℃。
进一步的改进是：所述高分子吸水树脂为高分子吸水树脂颗粒或高分子吸水纤维。
进一步的改进是：所述高分子吸水树脂的添加量为第二层纸纤维层的50-70wt％。
进一步的改进是：所述离子交换纤维的添加量为高分子吸水树脂重的80～90％。
进一步的改进是：所述离子交换纤维添加机构包括离子交换纤维储存罐、中空输送管、吸附装置、下料塔、加压器、下料管，所述中空输送管的一端与离子交换纤维储存罐连通，另一端与下料塔连通，所述吸附装置设置在中空输送管的上方，所述加压器设置在下料塔外侧壁上，所述下料管设置在下料塔的下方，所述下料管设有出口。
一种吸水纸，包括第一层纸纤维层和设置在其下表面的第二层纸纤维层，所述第二层纸纤维层包括纸纤维层，所述纸纤维层的上表面均均布有高分子吸水树脂，所述高分子吸水树脂通过热熔胶固定在纸纤维层的上表面，所述高分子树脂上覆盖有离子交换纤维层。
进一步的改进是：所述第一层纸纤维层和第二层纸纤维层通过热压合固定连接。
通过采用前述技术方案，本发明的有益效果是：
1、本发明的吸水纸，由第一层纸纤维层和设置在其下表面的第二层纸纤维层组成，第二层纸纤维层上均布有高分子吸水树脂和离子交换纤维，所述离子 交换纤维可以交换1价和2价的金属离子，使高分子吸水树脂的吸收速度加快且提升高分子吸水树脂的吸水量，提升材料的扩散性和干爽性，其具体原理为：离子交换纤维吸附人体排泄物中的1价和2价离子，排泄物中的这些离子会抑制高分子吸水树脂对水的吸水，影响高分子吸水树脂的吸水速度和吸水量，而离子交换纤维可将这些离子进行吸附，从而解除对高分子吸水树脂的抑制作用，使高分子吸水树脂的吸水量得到提升，吸水速度也得到加快。
2、与传统的吸水纸相比，本发明的吸水纸添加有高分子吸水树脂及离子交换纤维，吸水量更大，锁水能力更高。
3、本发明的吸水纸是采用湿法造纸，与传统的干法造纸不同，第二层纸纤维层在半干状态下添加高分子吸水树脂和离子交换纤维，再与已经烘干的第一层纸纤维层进行复合，接着再烘干，采用这种工序得到的纸张更薄，比传统的干法制备的吸水纸薄0.8mm以下，柔软度更高。
4、本发明的离子交换纤维机构的运作原理与高分子添加机构类似，可采用高分子添加机构替代，无需研发新的设备。
5、本发明的离子交换纤维优选为聚丙烯离子交换纤维，且纤维是采用3-10mm的短纤维，纤维的尺寸小，可以顺利的通过离子交换机构施加到高分子吸水树脂上，高分子吸水树脂为颗粒状或纤维状，离子交换纤维通过下料管的出口均匀的分布在高分子吸水树脂的表面，由于在分布离子交换纤维时底下的喷洒有高分子吸水树脂的纸纤维层是出于传输运动的状态，因此，离子交换纤维不会聚集在一块而会呈均匀分散在高分子吸水树脂的表面。
附图说明
图1为本发明实施例一吸水纸的结构分解图；
图2为本发明实施例一吸水纸的制备工艺流程图；
图3为本发明实施例一中离子交换纤维添加机构的结构示意图。
具体实施方式
以下将结合具体实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。
若未特别指明，实施例中所采用的技术手段为本领域技术人员所熟知的常规手段，所采用的试剂和产品也均为可商业获得的。所用试剂的来源、商品名以及有必要列出其组成成分者，均在首次出现时标明。
实施例一
参考图1，一种吸水纸，包括第一层纸纤维层1和设置在其下表面的第二层纸纤维层2，所述第一层纸纤维层1和第二层纸纤维层2通过热压合固定连接，所述第二层纸纤维层2包括纸纤维层21，所述纸纤维层21的上表面均均布有高分子吸水树脂22，所述高分子吸水树脂22通过热熔胶固定在纸纤维层21的上表面，所述高分子树脂22上覆盖有离子交换纤维层23。其中，离子交换纤维层由聚丙烯腈离子交换纤维通过离子交换纤维添加机构撒泼到高分子树脂22上，聚丙烯腈离子交换纤维为3-10mm的短纤维。
参考图2和图3，一种吸水纸的制备方法，包括以下处理步骤：
1)第一层纸纤维层的制备：
a、以木浆纤维为原料，送入打浆池打浆，打浆度控制在30°；
b、配浆：将打浆后的浆料送入成浆池进行配浆，配浆时加入湿强剂和烷基磷酸盐弱亲水表面活性剂，所述湿强剂的加入量为55kg/t纸浆，所述烷基磷酸盐亲水表面活性剂的加入量为10kg/t纸浆；
c、上网抄纸:将配浆后的浆料流出送入皮带进行成网；
d、脱水；
e、烘干；
2)第二层纸纤维层的制备：采用上述步骤a至d，制得半干状态的纸纤维层，在半干状态的纸纤维层上表面在线撒播高分子吸水树脂颗粒，在撒播高分子吸 水树脂颗粒前先在纸纤维层上喷洒一层热熔胶，再经过离子交换纤维添加机构，将聚丙烯腈离子交换纤维在线分布到高分子吸水树脂颗粒的上层，即得到第二层纸纤维层；所述高分子吸水树脂的添加量为第二层纸纤维层重的50％；所述离子交换纤维的添加量为高分子吸水树脂重的90％；所述离子交换纤维添加机构包括离子交换纤维储存罐3、中空输送管4、吸附装置5、下料塔6、加压器7、下料管8，所述中空输送管4的一端与离子交换纤维储存罐3连通，另一端与下料塔6连通，所述吸附装置设置在中空输送管的上方，所述加压器7设置在下料塔6外侧壁上，所述下料管8设置在下料塔6的下方，所述下料管8设有出口81，离子交换纤维先裁切成3-10mm的短纤维，再送入离子交换纤维储存罐3中，离子交换纤维储存罐3中的短纤维通过中空管道被吸附装置吸附到下料塔6中，下料塔的外侧壁上设有加压器7，对下料塔6进行增压，使下料塔中的短纤维顺利的输送到下料管并通过出口81输送到高分子吸水树脂颗粒上；
3)第一层纸纤维层和第二层纸纤维层复合：将步骤1)制得的第一层纸纤维层在线复合到步骤2)制得的第二层纸纤维层的上表面，并在40℃进行烘干；
4)热压合：将复合后的第一层纸纤维层和第二层纸纤维层送入一组热压合辊进行在线热压合，热压合处理时温度控制在50℃；
5)成卷；
6)分切。
实施例二
参考实施例一，本实施例与实施例一相比，制备过程中的参数不同，步骤1)a中木浆的打浆度控制在35°，步骤b中湿强剂的加入量为60kg/t纸浆，烷基磷酸盐亲水表面活性剂的加入量为15kg/t纸浆；步骤3)中烘干温度为80℃，第一层纸纤维层和第二层纸纤维层热压合的温度为50℃，高分子吸水树脂颗粒换成高分子吸水纤维；高分子吸水纤维的添加量为第二层纸纤维层的60％wt，离子交换纤维的添加量为高分子吸水纤维重的90％。添加有高分子吸水树脂纤维的纸纤 维层先经过喷洒一层热熔胶，离子纤维再上到高分子吸水纤维上，通过热熔胶将离子交换纤维固定在高分子吸水纤维上。
其中，本发明中，步骤a打浆度控制在30-40°，步骤b中湿强剂的加入量为55～60kg/t纸浆，烷基磷酸盐亲水表面活性剂的加入量为10～15kg/t纸浆；3)第一层纸纤维层和第二层纸纤维层复合烘干温度在40-100℃进行；复合后的第一层纸纤维层和第二层纸纤维层送入一组热压合辊进行在线热压合，热压合处理时温度控制在40-60℃；所述高分子吸水树脂的添加量为第二层纸纤维层的50-70wt％；离子交换纤维的添加量为高分子吸水树脂重的80～90％。在上述参数范围内均可实现本发明的目的。
本发明的聚丙烯腈离子交换纤维、湿强剂、烷基磷酸盐亲水表面活性剂均可从市场上直接购买到。吸附装置为可产生负压的吸附设备，为现有公知设备，加压器也为公知设备，在此不再赘述。
以上所记载，仅为利用本创作技术内容的实施例，任何熟悉本项技艺者运用本创作所做的修饰、变化，皆属本创作主张的专利范围，而不限于实施例所揭示者。

Claims (7)

  1. 一种吸水纸的制备方法，其特征在于，包括以下处理步骤：
    1)第一层纸纤维层的制备：
    a、以木浆纤维为原料，送入打浆池打浆，打浆度控制在30-40°；
    b、配浆：将打浆后的浆料送入成浆池进行配浆，配浆时加入湿强剂和烷基磷酸盐弱亲水表面活性剂，所述湿强剂的加入量为55～60kg/t纸浆，所述烷基磷酸盐亲水表面活性剂的加入量为10～15kg/t纸浆；
    c、上网抄纸:将配浆后的浆料进入成网装置进行成网；
    d、脱水；
    e、烘干；
    2)第二层纸纤维层的制备：采用上述步骤a至d，制得半干状态的纸纤维层，在半干状态的纸纤维层上表面在线撒播高分子吸水树脂，再经过离子交换纤维添加机构，将离子交换纤维在线分布到高分子吸水树脂的上层，即得到第二层纸纤维层；
    3)第一层纸纤维层和第二层纸纤维层复合：将步骤1)制得的第一层纸纤维层在线复合到步骤2)制得的第二层纸纤维层的上表面，并在40-100℃进行烘干；
    4)成卷；
    5)分切。
  2. 根据权利要求1所述的一种吸水纸的制备方法，其特征在于：所述离子交换纤维为聚丙烯腈纤维。
  3. 根据权利要求1或2所述的一种吸水纸的制备方法，其特征在于：在步骤3)之后步骤4)之前，将复合后的第一层纸纤维层和第二层纸纤维层送入一组热压合辊进行在线热压合，热压合处理时温度控制在40-60℃。
  4. 根据权利要求1所述的一种吸水纸的制备方法，其特征在于：所述高分子吸水树脂为高分子吸水树脂颗粒或高分子吸水纤维。
  5. 根据权利要求1所述的一种吸水纸的制备方法，其特征在于：所述高分子吸水树脂的添加量为第二层纸纤维层的50-70wt％。
  6. 根据权利要求1所述的一种吸水纸的制备方法，其特征在于：所述离子交换纤维的添加量为高分子吸水树脂重的80～90％。
  7. 根据权利要求1所述的一种吸水纸的制备方法，其特征在于：所述离子交换纤维添加机构包括离子交换纤维储存罐、中空输送管、吸附装置、下料塔、加压器、下料管，所述中空输送管的一端与离子交换纤维储存罐连通，另一端与下料塔连通，所述吸附装置设置在中空输送管的上方，所述加压器设置在下料塔外侧壁上，所述下料管设置在下料塔的下方，所述下料管设有出口。
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