CN114892446A - Degradable kitchen wipe as well as preparation method and application thereof - Google Patents

Degradable kitchen wipe as well as preparation method and application thereof Download PDF

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Publication number
CN114892446A
CN114892446A CN202210606929.3A CN202210606929A CN114892446A CN 114892446 A CN114892446 A CN 114892446A CN 202210606929 A CN202210606929 A CN 202210606929A CN 114892446 A CN114892446 A CN 114892446A
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China
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pulp
concentration
slurry
pulping
degradable
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CN202210606929.3A
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Chinese (zh)
Inventor
王斌
付浩成
李军
李金鹏
陈克复
丁霞
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China Paper Technology And Culture Development Jiangsu Co ltd
South China University of Technology SCUT
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China Paper Technology And Culture Development Jiangsu Co ltd
South China University of Technology SCUT
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Priority to CN202210606929.3A priority Critical patent/CN114892446A/en
Publication of CN114892446A publication Critical patent/CN114892446A/en
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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
    • 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
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • 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
    • D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
    • 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
    • D21H17/02—Material of vegetable origin
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D21H17/26—Ethers thereof
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Abstract

The invention discloses a degradable kitchen wipe and a preparation method and application thereof. The method comprises the following steps: pulping cotton pulp, removing slag, and performing pulping treatment to obtain long fiber pulp with a beating degree of 28-32 DEG SR; respectively pulping and deslagging the hardwood pulp and the dissolving pulp to obtain short fiber pulp hardwood pulp and dissolving pulp; adjusting the concentration of the three kinds of slurry to 2-6 wt%, cutting the slurry by a pulping machine, and uniformly mixing the slurry according to a proportion to obtain mixed slurry; and finally, adding 3-6 wt% of cross-linking agent, and making into paper and molding to obtain the degradable kitchen wipe. The degradable kitchen wipe prepared by the invention has good air permeability, higher tensile and absorption properties and good flushability.

Description

Degradable kitchen wipe as well as preparation method and application thereof
Technical Field
The invention belongs to the field of paper production processes, and particularly relates to a degradable kitchen wipe as well as a preparation method and application thereof.
Background
With the development of science and technology and the improvement of living standard of people, the requirement of people on the cleanness of kitchen sanitation is higher and higher. The wiping of cooking ranges, hoods and dry dishes in kitchens is often disturbing. At present, the rag is widely used for cleaning kitchen sanitation, but the cleaning of the towel becomes difficult during the recycling process, and bacteria can grow. Although sponge materials such as dish washing sponge, melamine sponge and nano sponge can replace rag materials, common wiping sponge is easy to break, deform and fall crumbs, is worn quickly and has heavy taste. Facial, toilet, paper napkins and paper wipes are used for kitchen hygiene cleaning and are generally not strong enough to be used in large quantities and easily damaged during wiping. In the face of these problems, the advent of kitchen wipes has provided a new line of thought for the sanitary cleaning of kitchens.
The kitchen wiping paper is a paper towel specially designed for kitchen cleaning and kitchen cooking, the whole paper is thicker and larger than a common paper towel, the hand feeling is rough, but the functionality is strong, and the paper towel is healthier, safer and more sanitary compared with a wiping cloth. The kitchen paper has two functions, namely household cleaning and absorption of food moisture and oil. However, the existing kitchen wipes on the market, the lazy wipes, are not easily dispersible and are difficult to achieve rapid degradation. Therefore, the development of the easily dispersible and degradable kitchen wipe is of great practical significance.
Chinese patent ZL201310165061.9 discloses a process for preparing paper, which comprises defibering softwood pulp and hardwood pulp, adding a softener to the defibered hardwood pulp, mixing the defibered hardwood pulp with the hardwood pulp added with the softener to obtain a mixed pulp, and making the mixed pulp into paper. The process utilizes the difference of fiber forms of softwood fiber (long fiber) and hardwood fiber (short fiber), and the proportion of the two fibers is adjusted to control the using amount of the softening agent and the residual amount in a white water system, but the paper manufactured by the process is easy to degrade, the wet strength is low, and although the wet strength of the paper can be improved by adding the wet strength agent, the currently commonly used wet strength agent mainly comprises resins, and the wet strength agent is not beneficial to the scattering and degradation of the paper.
Researches show that the wet strength of paper can be improved by adding polyvinyl alcohol or starch, but the retention rate is low when the polyvinyl alcohol is directly added into mixed pulp, so that the effect of increasing the wet strength of the finished paper is not obvious enough. Chinese patent CN201610699969.1 discloses a high-efficiency papermaking process, which uses polyvinyl alcohol as a cross-linking agent, and obtains paper with higher wet strength by mixing with defibered softwood pulp and hardwood pulp and then papermaking. Although the paper making process of the invention can reduce the use amount of the traditional wet strength agent, the wet strength agent has adverse effect on the dispersibility, the process improves the strength of the paper but loses the dispersibility of the paper, and the requirements of the strength and the dispersibility are difficult to meet at the same time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of degradable kitchen wipes.
Another object of the present invention is to provide a degradable kitchen wipe prepared by the method.
It is a further object of the present invention to provide the use of such degradable kitchen wipes.
The purpose of the invention is realized by the following technical scheme:
a preparation method of degradable kitchen wipes comprises the following steps:
(1) putting cotton pulp into a pulp crusher for crushing, adding water into crushed long fibers for diluting, and removing slag to obtain long fiber pulp (cotton pulp); respectively putting hardwood pulp and dissolving pulp into a pulper for disintegration, and then respectively adding water into disintegrated short fibers for dilution and removing slag to obtain short fiber pulp hardwood pulp and dissolving pulp;
(2) pumping the long fiber pulp (cotton pulp) into a double-roller pulp extruder to adjust the pulp concentration to 20-30 wt%, and then performing pulp grinding treatment to divide the filaments into brooms to obtain the long fiber pulp with the beating degree of 28-32 DEG SR; adding water into the long fiber pulp subjected to the pulping treatment and the short fiber pulp hardwood pulp and the dissolving pulp obtained in the step (1) respectively to adjust the pulp concentration to 2-6 wt%, and cutting by using a pulping machine to obtain cut cotton pulp, hardwood pulp and dissolving pulp;
(3) uniformly mixing the pulp according to the proportion of 60-90 wt% of the cut cotton pulp, 10-30 wt% of the hardwood pulp and 0-10 wt% of the dissolving pulp, and then further performing fibrillation by using a refiner to obtain a fibrillated mixed pulp;
(4) adding 3-6 wt% of cross-linking agent into the mixed slurry obtained in the step (3), diluting the slurry concentration to 0.2-0.3 wt%, and then using a paper machine to make and form to obtain the degradable kitchen wipes; wherein the cross-linking agent is at least two of konjac flour, polyvinyl alcohol, xanthan gum, carboxymethyl cellulose, carrageenan, polyamide epichlorohydrin resin (PAE), starch and polylactic acid.
The concentration of the disintegrated slurry in the step (1) is 5-15 wt%; preferably 10 wt%.
The time for the disintegration in the step (1) is 5-15 min; preferably 10 min.
The deslagging in the step (1) is carried out by adopting a conical deslagging device, the throughput of the conical deslagging device is 1600-1800L/min (preferably 1800L/min), the slurry concentration is 2-5% (preferably 5 wt%), the slurry inlet pressure is 0.20-0.35 MPa (preferably 0.3MPa), and the slurry outlet pressure is 0.01-0.05 MPa (preferably 0.03 MPa).
The pulp inlet concentration of the double-roller pulp extruding machine in the step (2) is 3.0-3.5 wt%; preferably 3.5 wt%.
In step (2), the concentration after adjustment by the twin-roll press is preferably 20 wt%.
The step (2) of grinding the pulp adopts a high-concentration pulp grinder to grind the pulp, and the motor power is 350-1200 kW; preferably 350 kW.
Adding water to adjust the concentration of the slurry in the step (2) to be preferably 5-6 wt%; more preferably to 6 wt%.
The beating degree of the fibers treated by the refiner in the step (2) is preferably 30 DEG SR.
And (3) cutting off in the step (2) by adopting a low-concentration pulping machine, wherein the pulping energy consumption is 80-120 kwh/t (preferably 100kwh/t), and the pulping time is 10 min.
The proportion of each slurry in the mixed slurry in the step (3) is preferably as follows: 70 wt% of cotton pulp, 20 wt% of hardwood pulp and 10 wt% of dissolving pulp.
And (4) the refining energy consumption of the refiner in the step (3) is 30-50 kwh/t (preferably 50kwh/t), and the refining time is 10 min.
The cross-linking agent in the step (4) is preferably at least two of konjac flour, polyvinyl alcohol, xanthan gum, carboxymethyl cellulose and carrageenan; further preferred are compositions comprising, in weight percent: 10-40% of konjac flour, 30-60% of polyvinyl alcohol, 0-40% of carboxymethyl cellulose, 0-20% of xanthan gum and 0-10% of carrageenan.
The polyvinyl alcohol is preferably 1788 type polyvinyl alcohol.
The diluted slurry concentration described in step (4) is preferably 0.25 wt%.
And (4) the paper making and forming in the step (4) is the paper making and forming in a paper pulp former through a head box.
The quantitative amount of the degradable kitchen wipes in the step (4) is 10-80 g/m 2 (ii) a Preferably 60g/m 2 。
A degradable kitchen wipe prepared by the method of any of the above.
The degradable kitchen wipe is applied to household paper.
The household paper comprises kitchen wiping paper (towel) and the like.
Compared with the prior art, the invention has the following advantages and effects:
1. the raw materials selected by the invention comprise cotton pulp, hardwood pulp and dissolving pulp with a certain dosage ratio, and the internal network structure of the paper is improved by long and short fiber matching, and because the cotton pulp has higher strength and less impurities, the paper manufactured by the paper has good toughness and high tensile strength; the hardwood pulp fibers and the dissolving pulp fibers are small in size, and can form a stable network structure with the cotton fibers through hydrogen bonds, so that a compact network structure is formed inside, and the strength of paper is improved.
2. The process of the invention adopts a high-concentration pulp grinder to carry out pulping treatment on cotton pulp, and the paper pulp fibers have mutual rubbing, friction and extrusion effects in the pulp grinding process, so that the finished paper has higher air permeability and tensile and absorption properties.
3. The paper pulp can be divided into longitudinal and transverse parts after being formed into paper, the longitudinal strength is greater than the transverse strength, so that the paper is easy to tear along the transverse direction when in use, and the paper is difficult to degrade along the longitudinal direction.
4. The kitchen wiping paper produced by the invention consists of 100% of degradable natural fiber and polysaccharide polymer, is easy to disperse and degrade, has an environment-friendly effect, can meet the daily use and cleaning requirements of consumers, and does not cause burden to the natural environment.
Drawings
FIG. 1 is an SEM topography of degradable kitchen wipes and other commercially available paper wipes prepared in example 1 of the present invention; wherein a is the degradable kitchen wipe prepared by the invention; b is a Vildahl water washable kitchen paper rag; c is rag for elegant and lazy people; d is a cleaning cloth for manufacturing lazy people in Beijing Dongdong.
FIG. 2 is an optical image of a degradable kitchen wipe prepared in example 3 of the present invention after being dispersed with other commercially available paper wipes; wherein a is the degradable kitchen wipe prepared by the invention; b is a Vildahl water washable kitchen paper rag; c is rag for elegant and lazy people; d is a cleaning cloth for manufacturing lazy people in Beijing Dongdong.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated. The following examples are given without reference to specific experimental conditions, and are generally in accordance with conventional experimental conditions. Unless otherwise specified, reagents and starting materials for use in the present invention are commercially available.
The cotton pulp sheet (referred to as cotton pulp for short) involved in the examples of the present invention was purchased from Vida group; hardwood pulp and dissolving pulp sheets were purchased from the solar paper industry.
The polyvinyl alcohol, konjac flour, xanthan gum, carrageenan and carboxymethyl cellulose referred to in the examples of the present invention can be obtained by conventional commercial methods.
Example 1
A preparation method of degradable kitchen wipes comprises the following steps:
(1) respectively putting cotton pulp, hardwood pulp and dissolving pulp into a hydrapulper (D type, SL-L1, Shandong gold duplex environmental protection equipment Co., Ltd.) for disintegration, wherein the disintegration concentration (namely the pulp concentration) is 10 wt%, the disintegration time is 10min, adding water to dilute the disintegrated long and short fibers, namely the cotton pulp (long fiber pulp), hardwood pulp (short fiber pulp, short fiber longer than the dissolving pulp) and the dissolving pulp (short fiber pulp), and then pumping the diluted pulp into a tapered slag remover for deslagging, wherein the throughput of the pulp is 1800L/min, the pulp inlet concentration is 5 wt%, the pulp inlet pressure of the tapered slag remover is 0.3MPa, and the pulp outlet pressure is 0.03 MPa;
(2) pumping long fiber pulp (cotton pulp) into a double-roller pulp extruding machine, wherein the pulp inlet concentration is 3.5 wt%; adjusting the pulp concentration to 20 wt% by a double-roller pulp extruder, and then sending the pulp into a high-concentration pulp grinder (ZDPH-600, Otto mechanical Co., Ltd., Shandong Hantong) for devillicate brooming, wherein the configured motor power of the high-concentration pulp grinder is 350kW, and long fiber pulp with the beating degree of 30 DEG SR is obtained; adding water into the pulped 30-degree SR long fiber pulp and the short fiber pulp (hardwood pulp and cotton pulp) treated by the conical slag separator in the step (1) respectively to adjust the concentration to 6 wt%, and then pumping the pulp into a low-concentration pulp grinder (OptiFiner RF-4i, Viimedes group) respectively for cutting, wherein the energy consumption of pulping is 100kwh/t, and the pulping time is 10 min;
(3) according to the proportion of 70 wt% of cotton pulp, 20 wt% of hardwood pulp and 10 wt% of dissolving pulp, the pulp after being ground into pulp is uniformly mixed in a pulp preparation tank and then enters a refiner (BHHB-11, Shandong Bohui environmental protection engineering Co., Ltd.) for further devillicate brooming, the grinding energy consumption is 50kwh/t, and the pulp after being processed by the refiner is sent into a pulp forming tank after 10 min;
(4) adding 6 wt% of a cross-linking agent into the pulping tank; wherein, the content of konjac flour in the cross-linking agent is 10 wt%, the content of 1788 type polyvinyl alcohol is 30 wt%, the content of xanthan gum is 20 wt%, and the content of carboxymethyl cellulose is 40 wt%;
(5) adding water into the mixed pulp in the pulp forming tank to dilute the mixed pulp until the pulp concentration is 0.25 wt%, forming uniform degradable kitchen wipes in a pulp former through a head box, and enabling the quantitative content to be 60g/m 2 。
Example 2
A preparation method of degradable kitchen wipes comprises the following steps:
(1) respectively putting cotton pulp, hardwood pulp and dissolving pulp into a hydrapulper (D type, SL-L1, Shandong gold duplex environmental protection equipment Co., Ltd.) for disintegration, wherein the disintegration concentration is 10 wt%, the disintegration time is 10min, respectively adding water to dilute the disintegrated cotton pulp (long fiber pulp), hardwood pulp (short fiber pulp, short fiber longer than the dissolving pulp) and dissolving pulp (short fiber pulp), and then pumping into a conical slag remover for deslagging, the throughput of the pulp is 1800L/min, the pulp inlet concentration is 5 wt%, the pulp inlet pressure of the conical slag remover is 0.3MPa, and the pulp outlet pressure is 0.03 MPa;
(2) pumping long fiber pulp (cotton pulp) into a double-roller pulp extruding machine, wherein the pulp inlet concentration is 3.5 wt%; adjusting the pulp concentration to 20 wt% by a double-roller pulp extruder, and then sending the pulp into a high-concentration pulp grinder (ZDPH-600, Otto mechanical Co., Ltd., Shandong Hantong) for devillicate brooming, wherein the configured motor power of the high-concentration pulp grinder is 350kW, and long fiber pulp with the beating degree of 30 DEG SR is obtained; adding water into the pulped 30-degree SR long fiber pulp and the short fiber pulp (hardwood pulp and cotton pulp) treated by the conical slag separator in the step (1) respectively to adjust the concentration to 6 wt%, and then pumping the pulp into a low-concentration pulp grinder (OptiFiner RF-4i, Viimedes group) respectively for cutting, wherein the energy consumption of pulping is 100kwh/t, and the pulping time is 10 min;
(3) according to the proportion of 70 wt% of cotton pulp, 20 wt% of hardwood pulp and 10 wt% of dissolving pulp, the pulp after being ground into pulp is uniformly mixed in a pulp preparation tank and then enters a refiner (BHHB-11, Shandong Bohui environmental protection engineering Co., Ltd.) for further devillicate brooming, the grinding energy consumption is 50kwh/t, and the pulp after being processed by the refiner is sent into a pulp forming tank after 10 min;
(4) adding 3 wt% of a cross-linking agent into the pulping tank; wherein, the content of the konjac flour in the cross-linking agent is 40 wt%, and the content of 1788 type polyvinyl alcohol is 60 wt%;
(5) adding water into the mixed pulp in the pulp forming tank to dilute the mixed pulp until the pulp concentration is 0.25 wt%, forming uniform degradable kitchen wipes in a pulp former through a head box, and enabling the quantitative content to be 60g/m 2 。
Example 3
A preparation method of degradable kitchen wipes comprises the following steps:
(1) respectively putting cotton pulp, hardwood pulp and dissolving pulp into a hydrapulper (D type, SL-L1, Shandong gold duplex environmental protection equipment Co., Ltd.) for disintegration, wherein the disintegration concentration is 10 wt%, the disintegration time is 10min, respectively adding water to dilute the disintegrated cotton pulp (long fiber pulp), hardwood pulp (short fiber pulp, short fiber longer than the dissolving pulp) and dissolving pulp (short fiber pulp), and then pumping into a conical slag remover for deslagging, the throughput of the pulp is 1800L/min, the pulp inlet concentration is 5 wt%, the pulp inlet pressure of the conical slag remover is 0.3MPa, and the pulp outlet pressure is 0.03 MPa;
(2) pumping long fiber pulp (cotton pulp) into a double-roller pulp extruding machine, wherein the pulp inlet concentration is 3.5 wt%; adjusting the pulp concentration to 20 wt% by a double-roller pulp extruder, and then sending the pulp into a high-concentration pulp grinder (ZDPH-600, Otto mechanical Co., Ltd., Shandong Hantong) for devillicate brooming, wherein the configured motor power of the high-concentration pulp grinder is 350kW, and long fiber pulp with the beating degree of 30 DEG SR is obtained; adding water into the pulped 30-degree SR long fiber pulp and the short fiber pulp (hardwood pulp and cotton pulp) treated by the conical slag separator in the step (1) respectively to adjust the concentration to 6 wt%, and then pumping the long fiber pulp and the short fiber pulp into a low-concentration pulping machine (OptiFiner RF-4i, Vimidde group) respectively for cutting, wherein the pulping energy consumption is 100kwh/t, and the pulping time is 10 min;
(3) according to the proportion of 70 wt% of cotton pulp, 20 wt% of hardwood pulp and 10 wt% of dissolving pulp, the pulp after being ground into pulp is uniformly mixed in a pulp preparation tank and then enters a refiner (BHHB-11, Shandong Bohui environmental protection engineering Co., Ltd.) for further devillicate brooming, the grinding energy consumption is 50kwh/t, and the pulp after being processed by the refiner is sent into a pulp forming tank after 10 min;
(4) adding 5 wt% of a cross-linking agent into the pulping tank; wherein, the content of the konjac flour in the cross-linking agent is 40 wt%, the content of 1788 type polyvinyl alcohol is 40 wt%, and the content of the carboxymethyl cellulose is 20 wt%;
(5) adding water into the mixed pulp in the pulp forming tank to dilute the mixed pulp until the pulp concentration is 0.25 wt%, forming uniform degradable kitchen wipes in a pulp former through a head box, and enabling the quantitative content to be 60g/m 2 。
Example 4
A preparation method of degradable kitchen wipes comprises the following steps:
(1) respectively putting cotton pulp, hardwood pulp and dissolving pulp into a hydrapulper (D type, SL-L1, Shandong gold duplex environmental protection equipment Co., Ltd.) for disintegration, wherein the disintegration concentration is 10 wt%, the disintegration time is 10min, respectively adding water to dilute the disintegrated cotton pulp (long fiber pulp), hardwood pulp (short fiber pulp, short fiber longer than the dissolving pulp) and dissolving pulp (short fiber pulp), and then pumping into a conical slag remover for deslagging, the throughput of the pulp is 1800L/min, the pulp inlet concentration is 5 wt%, the pulp inlet pressure of the conical slag remover is 0.3MPa, and the pulp outlet pressure is 0.03 MPa;
(2) pumping long fiber pulp (cotton pulp) into a double-roller pulp extruding machine, wherein the pulp inlet concentration is 3.5 wt%; adjusting the pulp concentration to 20 wt% by a double-roller pulp extruder, and then sending the pulp into a high-concentration pulp grinder (ZDPH-600, Otto mechanical Co., Ltd., Shandong Hantong) for devillicate brooming, wherein the configured motor power of the high-concentration pulp grinder is 350kW, and long fiber pulp with the beating degree of 30 DEG SR is obtained; adding water into the pulped 30-degree SR long fiber pulp and the short fiber pulp (hardwood pulp and cotton pulp) treated by the conical slag separator in the step (1) respectively to adjust the concentration to 6 wt%, and then pumping the pulp into a low-concentration pulp grinder (OptiFiner RF-4i, Viimedes group) respectively for cutting, wherein the energy consumption of pulping is 100kwh/t, and the pulping time is 10 min;
(3) according to the proportion of 70 wt% of cotton pulp, 20 wt% of hardwood pulp and 10 wt% of dissolving pulp, the pulp after being ground into pulp is uniformly mixed in a pulp preparation tank and then enters a refiner (BHHB-11, Shandong Bohui environmental protection engineering Co., Ltd.) for further devillicate brooming, the grinding energy consumption is 50kwh/t, and the pulp after being processed by the refiner is sent into a pulp forming tank after 10 min;
(4) adding 5 wt% of a cross-linking agent into the pulping tank; wherein, the content of konjac flour in the cross-linking agent is 20 wt%, the content of 1788 type polyvinyl alcohol is 40 wt%, the content of carboxymethyl cellulose is 20 wt%, the content of xanthan gum is 10 wt%, and the content of carrageenan is 10 wt%;
(5) adding water into the mixed pulp in the pulp forming tank to dilute the mixed pulp until the pulp concentration is 0.25 wt%, forming uniform degradable kitchen wipes in a pulp former through a head box, and enabling the quantitative content to be 60g/m 2 。
Comparative example 1
A water-washable kitchen paper rag (Vida) from Taobao was used as a control sample and subjected to a washability study using a Jiuyang wall breaking machine (Y912C): in order to simulate the flushing and dispersing force of the toilet, the wall breaking machine power is adjusted to the lowest level L (the power is 400W), and the dispersion condition of the wall breaking machine in water is observed after the wall breaking machine is untwined for 2 min.
Comparative example 2
The rag purchased from Taobao is used as a comparison sample, and a Jiuyang wall breaking machine (Y912C) is adopted to carry out flushability exploration: in order to simulate the flushing and dispersing force of the toilet, the wall breaking machine power is adjusted to the lowest level L (the power is 400W), and the dispersion condition of the wall breaking machine in water is observed after the wall breaking machine is untwined for 2 min.
Comparative example 3
The cleaning cloth is prepared by taking Beijing spaghetti cleaning rag purchased from Taobao as a comparison sample, and adopting a Jiuyang wall breaking machine (Y912C) to research the flushability: in order to simulate the flushing and dispersing force of the toilet, the wall breaking machine power is adjusted to the lowest level L (the power is 400W), and the dispersion condition of the wall breaking machine in water is observed after the wall breaking machine is untwined for 2 min.
Effects of the embodiment
(1) The degradable kitchen wipes from example 1 and the commercial kitchen wipes from comparative examples 1-3 were observed under a scanning electron microscope.
The SEM morphology is shown in FIG. 1: as can be seen from the figure, the degradable kitchen wipes prepared according to the present invention have a similar fiber network structure to the commercially available kitchen wipes, illustrating that four kitchen wipes consist primarily of pulp fibers.
(2) The resulting degradable kitchen wipe of example 3 was tested for flushability: all samples were cut to the same size (5 cm. times.5 cm), placed in a Jiuyang cell-wall breaker (Y912C) for flushability testing, the cell-wall breaker power was adjusted to the lowest L-range (power 400W), and the dispersion in water was observed after 2min of disintegration, and compared to the kitchen wipes of comparative examples 1-3.
The results are shown in FIG. 2: after comparing the flushability of the degradable kitchen wipe prepared in the embodiment 3 of the invention with that of a commercially available kitchen wipe, the degradable kitchen wipe prepared in the invention can be easily flushable within 2min under the action of low flushability, which shows that the degradable kitchen wipe has excellent flushability.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A preparation method of degradable kitchen wipes is characterized by comprising the following steps:
(1) putting cotton pulp into a pulp crusher for crushing, adding water into crushed long fibers for diluting, and removing slag to obtain long fiber pulp; respectively putting hardwood pulp and dissolving pulp into a pulper for disintegration, and then respectively adding water into disintegrated short fibers for dilution and removing slag to obtain short fiber pulp hardwood pulp and dissolving pulp;
(2) pumping the long fiber pulp into a double-roller pulp extruder to adjust the pulp concentration to 20-30 wt%, and then performing pulp grinding treatment to divide the filaments into brooms to obtain the long fiber pulp with the beating degree of 28-32 DEG SR; adding water into the long fiber pulp subjected to the pulping treatment and the short fiber pulp hardwood pulp and the dissolving pulp obtained in the step (1) respectively to adjust the pulp concentration to 2-6 wt%, and cutting by using a pulping machine to obtain cut cotton pulp, hardwood pulp and dissolving pulp;
(3) uniformly mixing the pulp according to the proportion of 60-90 wt% of the cut cotton pulp, 10-30 wt% of the hardwood pulp and 0-10 wt% of the dissolving pulp, and then further performing fibrillation by using a refiner to obtain a fibrillated mixed pulp;
(4) adding 3-6 wt% of cross-linking agent into the mixed slurry obtained in the step (3), diluting the slurry concentration to 0.2-0.3 wt%, and then using a paper machine to make and form to obtain the degradable kitchen wipes; wherein the cross-linking agent is at least two of konjac flour, polyvinyl alcohol, xanthan gum, carboxymethyl cellulose, carrageenan, polyamide epichlorohydrin resin, starch and polylactic acid.
2. The method of making a degradable kitchen wipe of claim 1, wherein:
the cross-linking agent in the step (4) is at least two of konjac flour, polyvinyl alcohol, xanthan gum, carboxymethyl cellulose and carrageenan;
the polyvinyl alcohol is 1788 type polyvinyl alcohol.
3. The method of making a degradable kitchen wipe of claim 2, wherein:
the cross-linking agent in the step (4) comprises the following components in percentage by weight: 10-40% of konjac flour, 30-60% of polyvinyl alcohol, 0-40% of carboxymethyl cellulose, 0-20% of xanthan gum and 0-10% of carrageenan.
4. The method of making a degradable kitchen wipe of claim 1, wherein:
the mixed slurry in the step (3) comprises the following slurry proportions: 70 wt% of cotton pulp, 20 wt% of hardwood pulp and 10 wt% of dissolving pulp.
5. The method of making a degradable kitchen wipe of claim 1, wherein:
the concentration of the disintegrated slurry in the step (1) is 5-15 wt%;
the time for the disintegration in the step (1) is 5-15 min;
the pulp inlet concentration of the double-roller pulp extruding machine in the step (2) is 3.0-3.5 wt%;
in the step (2), the concentration after being adjusted by a double-roller pulp extruding machine is 20 wt%;
adding water to adjust the concentration of the slurry to 5-6 wt% in the step (2);
the diluted slurry concentration in step (4) was 0.25 wt%.
6. The method of making a degradable kitchen wipe of claim 1, wherein:
the concentration of the crushed slurry in the step (1) is 10 wt%;
the time for the disintegration in the step (1) is 10 min;
the pulp inlet concentration of the double-roller pulp extruding machine in the step (2) is 3.5 wt%;
and (3) adding water to adjust the concentration of the slurry to 5 wt%.
7. The method of making a degradable kitchen wipe of claim 1, wherein:
the deslagging in the step (1) is carried out by adopting a conical deslagging device, the throughput of the conical deslagging device is 1600-1800L/min, the slurry concentration is 2-5%, the slurry inlet pressure is 0.20-0.35 MPa, and the slurry outlet pressure is 0.01-0.05 MPa;
the step (2) of grinding the pulp adopts a high-concentration pulp grinder to grind the pulp, and the motor power is 350-1200 kW;
the cutting in the step (2) is performed by adopting a low-concentration pulping machine, the pulping energy consumption is 80-120 kwh/t, and the pulping time is 10 min;
and (4) the refining energy consumption of the refiner in the step (3) is 30-50 kwh/t, and the refining time is 10 min.
8. The method of making a degradable kitchen wipe of claim 7, wherein:
the throughput of the conical slag separator is 1800L/min, the slurry concentration is 5 wt%, the slurry inlet pressure is 0.3MPa, and the slurry outlet pressure is 0.03 MPa;
the motor power of the high-concentration pulping machine is 350 kW;
the pulping energy consumption of the low-concentration pulping machine is 100 kwh/t;
the refining energy consumption of the refiner is 50 kwh/t.
9. A degradable kitchen wipe, characterized in that: prepared by the method of any one of claims 1 to 8.
10. Use of the degradable kitchen wipe of claim 9 in household paper.
CN202210606929.3A 2022-05-31 2022-05-31 Degradable kitchen wipe as well as preparation method and application thereof Pending CN114892446A (en)

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