CN110318298B - Multilayer kitchen paper containing composite sizing liquid - Google Patents
Multilayer kitchen paper containing composite sizing liquid Download PDFInfo
- Publication number
- CN110318298B CN110318298B CN201910561803.7A CN201910561803A CN110318298B CN 110318298 B CN110318298 B CN 110318298B CN 201910561803 A CN201910561803 A CN 201910561803A CN 110318298 B CN110318298 B CN 110318298B
- Authority
- CN
- China
- Prior art keywords
- layer
- pulp
- paper
- sizing
- base paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 35
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Images
Classifications
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- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
Abstract
The invention relates to a multilayer kitchen paper containing composite sizing liquid, which comprises the following components: an upper layer base paper comprising an upper surface layer and a lower surface layer; a hollow layer; applying a glue layer; a hollow layer; a lower base paper comprising an upper surface layer and a lower surface layer; wherein the sizing layer is a composite sizing solution consisting of the following components: anionic rosin sizing agent, cationic starch sizing agent, cationic aqueous polyurethane-acrylate and sizing liquid reinforcementAn agent and the balance water; wherein the size enhancer is a mixture comprising a pentafluoroethyl-substituted pyridine compound of the formula, a polysorbate, and a carboxymethyl cellulose;
the composite sizing solution can keep higher oil absorption and water absorption characteristics of the kitchen paper with dirt such as oil stain, water stain and the like, can completely prevent the dirt from migrating and infiltrating to a handheld surface, improves the capability of storing the dirt of the kitchen paper, has a new heat insulation effect, and is also beneficial to inhibiting bacterial growth, delaying putrefaction and reducing pollution.
Description
Technical Field
The invention relates to kitchen paper, in particular to multilayer kitchen paper containing composite sizing liquid.
Background
The kitchen paper is the paper towel specially used for the kitchen. The paper towel is larger and thicker than common paper towels, has good water and oil absorption, is a good helper for household cleaning and food oil absorption, and can be bought in large supermarkets. When used in kitchen, kitchen paper is commonly used to dry dishes, wipe stoves, hoods, and the like. Because the paper is thick and has strong water absorption capacity, and no hair or paper scraps are left, the cleaning agent is also suitable for household cleaning of glass windows, mirror surfaces, tables and other non-kitchen places. In addition, the folded kitchen paper towel is padded at the bottom of an oil filtering box of the range hood to absorb redundant oil stains, so that the phenomenon that stubborn oil stains are accumulated in the box is avoided, and the range hood is convenient to clean. The kitchen paper can also prevent leakage, and the kitchen paper is padded under the bottle of the seasoning to prevent leakage; of course, the refrigerator can also be placed in a refrigerator to prevent food and beverage from leaking, so that the refrigerator is easier to clean and the household appliances are convenient to clean. Kitchen paper can also be used in food: firstly, water is absorbed, for example, the water on the surface of the fish and in the pot is absorbed by kitchen paper before the fish is fried, and oil explosion can not occur during frying. And the thawed meat can generate bloody water, and the food can be kept fresh and sanitary by using kitchen paper to suck the meat. In addition, before the vegetables and fruits are put into the refrigerator, kitchen paper is wrapped and then the freshness protection package is sleeved, so that the freshness protection time of food can be longer. As for oil absorption, the fried food is put on the kitchen paper after being taken out of the pan, so that the kitchen paper absorbs the redundant oil, and the fried food is not greasy to eat and is healthier.
However, the prior art kitchen paper has the following disadvantages in use: (1) the bleached commodity wood pulp is used, the pulping yield of the chemical method is low, the utilization efficiency of the plant fiber is low, and the use cost is high; (2) under the condition that the gram weight is reduced and the whole use thickness cannot be met, the use purpose of water absorption and water locking is achieved by the hollow layer generated by point-to-point embossing, but under the condition of wiping by certain gravity, the hollow water locking layer is pressed to cause the wiped liquid to return to the surface, the cleaning efficiency is reduced, and the hands are easily polluted.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide kitchen paper containing a composite sizing agent, wherein the composite sizing agent can keep higher oil absorption and water absorption characteristics of the kitchen paper with dirt such as oil stain, water stain and the like, can completely prevent the dirt from migrating and infiltrating to a handheld surface, improves the dirt storage capacity of the kitchen paper, has a new heat insulation effect, and is beneficial to inhibiting bacterial growth, delaying corruption and reducing pollution.
The technical scheme adopted by the invention for realizing the purpose is as follows:
[1] the composite sizing agent for the base paper for the kitchen is prepared from the following components in percentage by mass:
the balance of water;
wherein the cationic waterborne polyurethane-acrylate is epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate,
the sizing liquid reinforcing agent is a mixture comprising pentafluoroethyl-substituted pyridines, polysorbate, and carboxymethylcellulose.
The sizing liquid reinforcing agent is a mixture of pentafluoroethyl-substituted pyridine compounds shown in a formula (1), polysorbate and carboxymethyl cellulose, and the weight ratio of the pentafluoroethyl-substituted pyridine compounds to the polysorbate to the carboxymethyl cellulose is 1: 5-8: 22-25.
This application the sizing liquid reinforcing agent constitutes the combined compatibility reinforcing agent with pentafluoroethyl substituted pyridine compound association polysorbate and carboxymethyl cellulose, the reinforcing agent not only can effectively strengthen compound sizing system water proof cadmium oiliness and film forming property, but also is favorable to inhibiting the breeding of harmful bacteria such as fungi, mould on the kitchen paper surface that is stained with filths such as greasy dirt, delays the kitchen paper surface's after the use rotten bad degree, reduces the smell pollution, improves the regional finish in kitchen.
In a preferred embodiment of the present invention, the method for preparing the anionic rosin sizing agent of the present invention comprises the steps of:
1) melting rosin at the temperature of 150-180 ℃, adding an anionic acrylic copolymer accounting for 10-30 wt% of the rosin, uniformly stirring, and adding water accounting for 20-50 wt% of the rosin and accounting for 80-90 ℃ to form a water-in-oil emulsion;
2) hot water with the temperature of more than 95 ℃ and the weight 15-30 times of that of the rosin is quickly added into the mixture under the stirring of 500-2000 r/min, and then the mixture is quickly cooled to the temperature of less than 35 ℃ within 5min to obtain the stable anionic rosin sizing agent.
The particle size of the anionic rosin sizing agent is 0.05-0.15 mu m.
Preferably, the method for preparing the anionic acrylic copolymer used in the method for preparing the anionic rosin sizing agent of the present invention is:
a) mixing methacrylic acid, octadecyl methacrylate and polyethylene glycol methacrylate in a molar ratio of 1: 1-2: 2.2-2.5, and dissolving the mixture in 4-10 times by weight of dry isopropanol;
b) adding dibenzoyl peroxide with the weight percentage of 1.5-5 wt% of reactants into one half of the mixture solution, stirring, reacting for 2 hours under the condition of nitrogen protection at 85 ℃, dripping the rest mixture solution into the reaction system through a dropping funnel within 2 hours, continuing to react for 3-5 hours, and stopping stirring and heating;
c) and concentrating the solution obtained by the reaction to remove the solvent, drying the obtained product to constant weight, and finally obtaining a transparent viscous semisolid product, namely the anionic acrylic copolymer.
Further preferably, the concentration and removal of the solvent in step c) can be carried out by using a vacuum distillation apparatus at room temperature and under vacuum by a water pump.
Further preferably, the drying in step c) may be performed by drawing a vacuum in a vacuum oven.
The anionic rosin sizing agent prepared by the method is white emulsion, a large amount of hot water is added into the system to convert water-in-oil emulsion into oil-in-water emulsion, the anionic rosin sizing agent has good stability and dispersibility, can be uniformly dispersed in water to fully contact with sizing agent during papermaking sizing to improve the sizing degree, can be infinitely dispersed in water, has the particle size of 0.05-0.15 mu m, can be stored for a long time, does not delaminate after being stored for 10 months at room temperature, brings great convenience to transportation and storage of industrial production, and can save the production cost.
In a preferred embodiment of the present invention, the method for preparing the cationic starch sizing agent according to the present invention comprises:
1) under mechanical stirring, uniformly mixing cationic starch and water according to a ratio of 1: 8-15, continuously stirring and heating to at least 95 ℃ for 30min to completely gelatinize the cationic starch;
2) uniformly mixing the cationic starch pasting solution, 8-10 wt% of dialdehyde chitosan water solution and distilled water according to the mass ratio of 1: 3-5: 5-10, continuously stirring and heating to at least 95 ℃ for 1h to obtain the dialdehyde chitosan/cationic starch composite sizing agent.
After the cationic starch sizing agent is applied to the surface of the kitchen paper, a certain degree of crosslinking is generated among dialdehyde chitosan, cationic starch and kitchen paper cellulose to form a film layer, the porosity is reduced, condensation reaction is generated among the dialdehyde chitosan, the cationic starch and the cellulose, the crosslinking degree is obviously increased, and a relatively flat coating is formed on the surface of the kitchen paper, so that the mechanical property is enhanced, the tensile index and the tearing index are improved, and the toughness of the kitchen paper is favorably improved.
In a preferred embodiment of the present invention, the method for preparing the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate comprises the following steps:
1) adding 20-30 parts by weight of castor oil, 1.2-3.0 parts by weight of isophorone diisocyanate, 5-12 parts by weight of butyl acrylate and 2-5 parts by weight of styrene into a dry three-neck flask with a stirrer, uniformly mixing, heating the system to 75-80 ℃, reacting for 2-3 h, and then cooling to 70 ℃;
2) adding 0.2-0.8 part by weight of N-methyl-diethanolamine, 0.5-2.0 parts by weight of 1, 4-butanediol, 10-14 parts by weight of epoxy resin E-44 and 0.1-0.4 part by weight of catalyst stannous octoate, and carrying out chain extension crosslinking reaction for 2-5 hours; cooling the system to 30 ℃, adding a neutralizing agent glacial acetic acid in a certain proportion, and continuously stirring for 30 min;
3) slowly adding equivalent ice water into the system under high-speed stirring for dispersing and emulsifying to prepare a cationic waterborne polyurethane emulsion, taking the cationic waterborne polyurethane emulsion as a seed emulsion, and heating to 75 ℃;
4) and (3) dropwise adding 0.5-3 parts by weight of aqueous azodiisobutyl amidine hydrochloride aqueous solution initiator into the system, completing dropwise adding for about 2 hours, and continuously carrying out heat preservation reaction for 4 hours to obtain the semitransparent epoxy resin modified castor oil based cationic aqueous polyurethane-acrylate composite emulsion.
The average particle size of the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate is 40-100 nm.
The epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate emulsion has higher crosslinking degree, can form a more compact crosslinked network structure, can endow the kitchen paper base paper with further improved water resistance due to the introduction of the epoxy resin, and forms a compact network structure due to the crosslinking of chemical bonds among molecules during polymerization reaction, so that the interaction force among molecules is increased, the distance among molecular chains is reduced, and a waterproof coating is formed on the surface of the paper, so that the penetration of water into the paper can be effectively prevented, and the sizing kitchen paper base paper has excellent hydrophobicity; the emulsion combines the advantages of epoxy resin and polyurethane-acrylate composite emulsion, has better bonding strength, and can endow paper with necessary surface strength, tensile strength and bursting strength when sizing.
The composite sizing agent for the base paper of the kitchen paper is a quaternary composite sizing system consisting of an anionic rosin sizing agent, a cationic starch sizing agent, epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate and a sizing agent reinforcing agent, the system has excellent cadmium oil resistance and film forming property, so that the surface of the kitchen paper with oil stains, water stains and other dirt can keep high oil absorption and water absorption characteristics, and the composite sizing liquid layer can completely prevent the oil stains, the water stains and other dirt from migrating and infiltrating to a hand-held surface, so that the hand-held surface is kept dry and clean; in addition, the sizing liquid reinforcing agent is beneficial to inhibiting the bacterial growth on the surface of the kitchen paper stained with dirt such as oil stain and the like while strengthening the water-resisting cadmium oiliness and film-forming property of the composite sizing system, delaying the rotten degree of the surface of the used kitchen paper, reducing the odor pollution and improving the cleanliness of a kitchen area.
[2] The kitchen paper prepared by the composite sizing liquid comprises the following components:
-an upper base paper comprising an upper surface layer and a lower surface layer;
-a hollow layer;
-a size layer;
-a hollow layer;
-a lower base paper comprising an upper surface layer and a lower surface layer;
wherein the sizing layer is the composite sizing solution of item [1 ].
Preferably, the upper layer base paper and the lower layer base paper both comprise an upper surface layer and a lower surface layer, and the two lower surface layers of the upper layer base paper and the lower layer base paper are oppositely arranged.
Preferably, the hollow layer of the upper layer base paper is between the lower surface layer of the upper layer base paper and the sizing layer, and the adjacent hollow layers are isolated.
Preferably, the hollow layer of the lower base paper is interposed between the sizing layer and the lower surface layer of the lower base paper, and the adjacent hollow layers are isolated.
Further preferably, the hollow layer is present between the lower surface layer of the upper base paper and the sizing layer and/or between the sizing layer and the lower surface layer of the lower base paper in a dot shape and/or a stripe shape and/or a belt shape and/or an arc shape.
Preferably, the top layer pulp comprises 65-90 wt% of bleached hardwood chemical pulp and 10-35 wt% of long fiber pulp; the lower surface layer pulp comprises 30-45 wt% of bleached softwood chemical pulp and 55-70 wt% of short fiber pulp.
Further preferably, the long fiber pulp is prepared by adjusting the concentration of long fibers in raw wood pulp to 25-50 wt%, and the long fibers are subjected to pulp dispersing treatment for 3-4 hours by using a pulp grinder, so that the beating degree of the long fibers is 22-25 DEG SR.
Further preferably, the staple fiber pulp is prepared by adjusting the concentration of staple fibers in raw wood pulp to 40-60 wt%, and defibering the staple fibers by using a defibering machine for 2-4 hours, wherein the power is 180-250 kW, and the rotating speed is 1000-1500 rpm.
The bleached hardwood chemical pulp and the long fiber pulp are used as upper surface layers and are in direct contact with consumers, and the lower fiber length, the lower fiber thickness and the higher beating degree of the long fibers bring better smoothness and softness of the surface of the finished paper, so that the use experience is improved; the bleached softwood chemical pulp and the short fiber pulp with higher fluffiness endow the lower surface layer with a compact outer surface layer, the surface strength is high, the phenomena of hair and powder falling are prevented, the secondary pollution on the surface of an object in the wiping process is reduced, the short fibers have more fine fiber content, a larger specific surface area of the fiber surface is brought, a better water absorption and locking function is brought for paper pages, and the prepared paper for the kitchen cannot cause rewet to pollute the hands under the action of gravity wiping.
The hollow layer arranged between the lower surface layer of the upper layer body paper and the sizing layer is beneficial to increasing the comfort level of a user for gripping the kitchen paper by a palm, improving the softness of the paper and improving the use hand feeling and experience; the hollow layer arranged between the sizing layer and the lower surface layer of the lower layer body paper is beneficial to storing sewage, oil stain and other dirt absorbed by the lower layer body paper, the dirt absorbing capacity of the kitchen paper is increased, the sewage, the oil stain and other dirt are prevented from dropping and diffusing, and the cleaning efficiency of the kitchen paper is improved; in addition, two-layer hollow layer still is favorable to promoting the temperature insulating effect of kitchen paper, reduces heat transmission efficiency, uses the kitchen paper to wipe the higher object of temperature when the consumer, can avoid high temperature to conduct rapidly to kitchen paper top layer, reduces the risk that the consumer was scalded, guarantees safety.
[3] A method for producing the kitchen paper according to item [2], comprising the steps of:
a pulping step: pulping bleached hardwood chemical pulp, long fiber pulp, bleached softwood chemical pulp and short fiber pulp respectively;
a slurry mixing step: bleached hardwood chemical pulp and long fiber pulp are used as upper surface pulp, and bleached softwood chemical pulp and short fiber pulp are used as lower surface pulp;
a paper forming step: the evenly mixed pulp is dewatered, pressed, dried and coiled on a double-layer pulp flowing box, and the papermaking quantitative is 15 +/-2 g/m2Base paper;
an embossing step: embossing the lower surface layer of the base paper to form the shape of a hollow layer;
a sizing and pressing step: applying the composite sizing solution according to the item [1] on the lower surface of the upper layer base paper or the lower layer base paper, and then pressing to obtain formed kitchen paper;
a post-treatment step: the kitchen paper is obtained by rolling, cutting, sterilizing and packaging the formed kitchen paper.
The pulping operation of the bleached hardwood chemical pulp is specifically as follows: and (3) carrying out disc grinding and sticky pulping on the bleached hardwood chemical pulp, brooming fibers as much as possible, wherein the concentration of the pulp is 25-50 wt%, and the beating degree of the pulp is controlled to be 15-20 SR.
The pulping operation of the long fiber pulp specifically comprises the following steps: adjusting the concentration of long fibers in the primary wood pulp to 25-50 wt%, and performing pulp dispersing treatment on the long fibers for 3-4 hours by using a pulp grinder to enable the beating degree to be 22-25 DEG SR.
The pulping operation of the short fiber pulp specifically comprises the following steps: adjusting the concentration of short fibers in the primary wood pulp to 40-60 wt%, and carrying out defibering treatment on the short fibers for 2-4 h by using a defibering machine, wherein the power is 180-250 kW, and the rotating speed is 1000-1500 rpm.
The pulping operation of the bleached softwood chemical pulp specifically comprises the following steps: and (3) grinding the bleached softwood chemical pulp in a disc mill to carry out free pulping, properly cutting off the bleached softwood chemical pulp on the basis of full defibering, wherein the pulp concentration is 25-50 wt%, and the beating degree of the pulp is controlled to be 22-28 DEG SR.
The prepared kitchen paper solves the problem of hand pollution caused by wetting of the traditional kitchen paper by water or oil, avoids secondary or repeated wiping caused by wetting of the kitchen paper in the cleaning process, simultaneously endows the kitchen paper with a bacteriostatic action, inhibits the breeding of harmful bacteria such as fungi and mold on the surface of the kitchen paper which is full of dirt such as oil stain and the like, delays the rotten degree of the surface of the used kitchen paper, reduces odor pollution, improves the cleanliness of a kitchen area, greatly optimizes the use experience, does not need to add a new process, and has the advantages of simple production process, no environmental pollution, continuous large-scale industrial production and the like.
The beneficial effects of the invention are as follows.
The composite sizing agent for the base paper of the kitchen paper is a quaternary composite sizing system consisting of an anionic rosin sizing agent, a cationic starch sizing agent, epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate and a sizing agent reinforcing agent, the system has excellent cadmium and oil resistance and film forming property, so that the kitchen paper can keep higher oil and water absorption characteristics while having dirt such as oil stain and water stain, and the composite sizing liquid layer can completely prevent the dirt such as the oil stain and the water stain from migrating and infiltrating to a hand-held surface, thereby keeping the hand-held surface dry and clean.
The sizing liquid reinforcing agent is beneficial to inhibiting the breeding of bacteria on the surface of the kitchen paper which is full of dirt such as oil stain and the like while strengthening the water-resisting cadmium oiliness and film-forming property of the composite sizing system, delaying the rotten degree of the surface of the used kitchen paper, reducing odor pollution and improving the cleanliness of a kitchen area.
The bleached hardwood chemical pulp and the long fiber pulp are used as upper surface layers and are in direct contact with consumers, and the lower fiber length, the lower fiber thickness and the higher beating degree of the long fibers bring better smoothness and softness of the surface of the finished paper, so that the use experience is improved; the bleached softwood chemical pulp and the short fiber pulp with higher fluffiness endow the lower surface layer with a compact outer surface layer, the surface strength is high, the phenomena of hair and powder falling are prevented, the secondary pollution on the surface of an object in the wiping process is reduced, the short fibers have more fine fiber content, a larger specific surface area of the fiber surface is brought, a better water absorption and locking function is brought for paper pages, and the prepared paper for the kitchen cannot cause rewet to pollute the hands under the action of gravity wiping.
The hollow layer arranged between the lower surface layer of the upper layer body paper and the sizing layer is beneficial to increasing the comfort level of a user for gripping the kitchen paper by a palm, improving the softness of the paper and improving the use hand feeling and experience; set up in hollow layer between the lower surface course of sizing layer and lower floor's body paper is favorable to storing sewage, filth such as oil stain that the lower floor's body paper absorbed, increases kitchen paper's dirt absorbing capacity, prevents the drippage and the diffusion of filth such as sewage, oil stain, promotes kitchen paper's cleaning efficiency.
Two-layer hollow layer still is favorable to promoting the temperature insulating effect of kitchen note paper, reduces heat transmission efficiency, uses the kitchen note paper to clean the higher object of temperature when the consumer, can avoid high temperature to conduct rapidly to kitchen note paper top layer, reduces the risk that the consumer was scalded, guarantees safety.
The invention adopts the technical scheme to provide the model essay, makes up the defects of the prior art, and has reasonable design and convenient operation.
Drawings
In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of the structure of the kitchen paper of the present invention;
FIG. 2 is a schematic view of the lower surface layer structure of the kitchen paper with a dotted hollow layer according to the present invention;
FIG. 3 is a schematic view of the lower surface structure of the kitchen paper with a strip-shaped hollow layer;
FIG. 4 is a schematic view of the lower surface layer structure of the kitchen paper with a band-shaped hollow layer;
FIG. 5 is a schematic view of the lower surface layer structure of the kitchen paper with an arc-shaped hollow layer.
Description of reference numerals: 1. a glue layer; 2. a lower surface layer; 201. a hollow layer; 3. and (4) an upper surface layer.
Detailed Description
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The present invention uses the methods and materials described herein; other suitable methods and materials known in the art may be used. The materials, methods, and examples described herein are illustrative only and are not intended to be limiting. All publications, patent applications, patents, provisional applications, database entries, and other references mentioned herein, and the like, are incorporated by reference herein in their entirety. In case of conflict, the present specification, including definitions, will control.
Other features and advantages of the invention will be apparent from the following detailed description, the accompanying drawings, and the claims.
The phrases "for example" and "such as" and grammatical equivalents thereof, and "without limitation," should be construed to follow a common usage unless expressly stated otherwise. As used herein, the word "about" refers to variations due to experimental error. Unless expressly stated otherwise, all measurements described herein, whether or not explicitly used, are to be understood as being modified by the word "about". As used herein, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.
In one embodiment of the present invention, the method for preparing the anionic rosin sizing agent of the present invention comprises the steps of:
1) melting rosin at 165 ℃, adding an anionic acrylic copolymer accounting for 15 wt% of the weight of the rosin, uniformly stirring, and adding water accounting for 40 wt% of the weight of the rosin and being at 85 ℃ to form a water-in-oil type emulsion;
2) hot water with the temperature of 98 ℃ which is 20 times of the weight of the rosin is quickly added under the stirring of 1200r/min, and then the temperature is quickly reduced to 30 ℃ within 5min, thus obtaining the stable anionic rosin sizing agent.
The particle size of the anionic rosin sizing agent is 0.05-0.15 mu m.
The preparation method of the anionic acrylic acid copolymer used in the method for preparing the anionic rosin sizing agent comprises the following steps:
a) mixing methacrylic acid, octadecyl methacrylate and polyethylene glycol methacrylate in a molar ratio of 1:2:2.5, and dissolving in 5 times by weight of dry isopropanol;
b) adding dibenzoyl peroxide with the weight percentage of 4 wt% of reactants into one half of the mixture solution, stirring, reacting for 2 hours under the protection of nitrogen at 85 ℃, dripping the rest mixture solution into the reaction system within 2 hours through a dropping funnel, continuing to react for 4 hours, and stopping stirring and heating;
c) and concentrating the solution obtained by the reaction to remove the solvent, drying the obtained product to constant weight, and finally obtaining a transparent viscous semisolid product, namely the anionic acrylic copolymer.
The solvent is removed by concentration in step c), and a vacuum distillation device is used for vacuumizing by a water pump at room temperature.
The drying in step c) may be carried out by applying a vacuum in a vacuum oven.
The anionic rosin sizing agent prepared by the method is white emulsion, a large amount of hot water is added into the system to convert water-in-oil emulsion into oil-in-water emulsion, the anionic rosin sizing agent has good stability and dispersibility, can be uniformly dispersed in water to fully contact with sizing agent during papermaking sizing to improve the sizing degree, can be infinitely dispersed in water, has the particle size of 0.05-0.15 mu m, can be stored for a long time, does not delaminate after being stored for 10 months at room temperature, brings great convenience to transportation and storage of industrial production, and can save the production cost.
In one embodiment of the present invention, a method of preparing the cationic starch sizing agent of the present invention comprises:
1) under mechanical stirring, uniformly mixing cationic starch and water according to a ratio of 1:10, continuously stirring and heating to 96 ℃ for 30min to completely gelatinize the cationic starch;
2) uniformly mixing the cationic starch pasting solution, 8 wt% dialdehyde chitosan water solution and distilled water according to the mass ratio of 1:4:8, continuously stirring and heating to 96 ℃ for 1h to obtain the dialdehyde chitosan/cationic starch composite sizing agent.
After the cationic starch sizing agent is applied to the surface of the kitchen paper, a certain degree of crosslinking is generated among dialdehyde chitosan, cationic starch and kitchen paper cellulose to form a film layer, the porosity is reduced, condensation reaction is generated among the dialdehyde chitosan, the cationic starch and the cellulose, the crosslinking degree is obviously increased, and a relatively flat coating is formed on the surface of the kitchen paper, so that the mechanical property is enhanced, the tensile index and the tearing index are improved, and the toughness of the kitchen paper is favorably improved.
In one embodiment of the present invention, a method for preparing the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate comprises:
1) adding 25 parts by weight of castor oil, 2 parts by weight of isophorone diisocyanate, 10 parts by weight of butyl acrylate and 4 parts by weight of styrene into a dry three-neck flask with a stirrer, uniformly mixing, heating the system to 80 ℃, reacting for 2 hours, and then cooling to 70 ℃;
2) adding 0.5 weight part of N-methyl-diethanolamine, 1.5 weight parts of 1, 4-butanediol, 10 weight parts of epoxy resin E-44 and 0.3 weight part of catalyst stannous octoate, and carrying out chain extension and crosslinking reaction for 4 hours; cooling the system to 30 ℃, adding a neutralizing agent glacial acetic acid in a certain proportion, and continuously stirring for 30 min;
3) slowly adding equivalent ice water into the system under high-speed stirring for dispersing and emulsifying to prepare a cationic waterborne polyurethane emulsion, taking the cationic waterborne polyurethane emulsion as a seed emulsion, and heating to 75 ℃;
4) dropwise adding 2 parts by weight of aqueous azodiisobutyl amidine hydrochloride aqueous solution initiator into the system, continuing to perform heat preservation reaction for 4 hours after 2 hours of dropwise adding, and obtaining the semitransparent epoxy resin modified castor oil based cationic aqueous polyurethane-acrylate composite emulsion.
The average particle size of the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate is 40-100 nm.
The epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate emulsion has higher crosslinking degree, can form a more compact crosslinked network structure, can endow the kitchen paper base paper with further improved water resistance due to the introduction of the epoxy resin, and forms a compact network structure due to the crosslinking of chemical bonds among molecules during polymerization reaction, so that the interaction force among molecules is increased, the distance among molecular chains is reduced, and a waterproof coating is formed on the surface of the paper, so that the penetration of water into the paper can be effectively prevented, and the sizing kitchen paper base paper has excellent hydrophobicity; the emulsion combines the advantages of epoxy resin and polyurethane-acrylate composite emulsion, has better bonding strength, and can endow paper with necessary surface strength, tensile strength and bursting strength when sizing.
Example 1:
the embodiment provides a composite sizing agent for base paper for kitchen paper, which is prepared from the following components in percentage by mass:
the balance of water;
wherein the cationic waterborne polyurethane-acrylate is epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate,
the sizing liquid reinforcing agent is a mixture comprising pentafluoroethyl-substituted pyridines, polysorbate, and carboxymethylcellulose.
The sizing liquid reinforcing agent is a mixture of pentafluoroethyl substituted pyridine compounds shown as a formula (1), polysorbate and carboxymethyl cellulose in a weight ratio of 1:5: 24.
This application the sizing liquid reinforcing agent constitutes the combined compatibility reinforcing agent with pentafluoroethyl substituted pyridine compound association polysorbate and carboxymethyl cellulose, the reinforcing agent not only can effectively strengthen compound sizing system water proof cadmium oiliness and film forming property, but also is favorable to inhibiting the breeding of harmful bacteria such as fungi, mould on the kitchen paper surface that is stained with filths such as greasy dirt, delays the kitchen paper surface's after the use rotten bad degree, reduces the smell pollution, improves the regional finish in kitchen.
In this example, the process for preparing the anionic rosin sizing agent of the present invention includes the steps of:
1) melting rosin at 170 ℃, adding an anionic acrylic copolymer accounting for 20 wt% of the rosin, uniformly stirring, and adding water accounting for 25 wt% of the rosin and being 80 ℃ to form a water-in-oil type emulsion;
2) hot water with the temperature of 98 ℃ which is 16 times of the weight of the rosin is quickly added under the stirring of 800r/min, and then the temperature is quickly reduced to 32 ℃ within 5min, thus obtaining the stable anionic rosin sizing agent.
The particle size of the anionic rosin sizing agent is 0.05-0.15 mu m.
The preparation method of the anionic acrylic acid copolymer used in the method for preparing the anionic rosin sizing agent comprises the following steps:
a) mixing methacrylic acid, octadecyl methacrylate and polyethylene glycol methacrylate in a molar ratio of 1:2:2.2, and dissolving in 10 times by weight of dry isopropanol;
b) adding dibenzoyl peroxide with the weight percentage of 4 wt% of reactants into one half of the mixture solution, stirring, reacting for 2 hours under the protection of nitrogen at 85 ℃, dripping the rest mixture solution into the reaction system within 2 hours through a dropping funnel, continuing to react for 4 hours, and stopping stirring and heating;
c) and concentrating the solution obtained by the reaction to remove the solvent, drying the obtained product to constant weight, and finally obtaining a transparent viscous semisolid product, namely the anionic acrylic copolymer.
The solvent is concentrated and removed in the step c) by a vacuum distillation device at room temperature and vacuumizing by a water pump.
The drying in the step c) is vacuum-pumping in a vacuum oven.
The anionic rosin sizing agent prepared by the method is white emulsion, a large amount of hot water is added into the system to convert water-in-oil emulsion into oil-in-water emulsion, the anionic rosin sizing agent has good stability and dispersibility, can be uniformly dispersed in water to fully contact with sizing agent during papermaking sizing to improve the sizing degree, can be infinitely dispersed in water, has the particle size of 0.05-0.15 mu m, can be stored for a long time, does not delaminate after being stored for 10 months at room temperature, brings great convenience to transportation and storage of industrial production, and can save the production cost.
In a preferred embodiment of the present invention, the method for preparing the cationic starch sizing agent according to the present invention comprises:
1) under mechanical stirring, uniformly mixing cationic starch and water according to a ratio of 1:12, continuously stirring and heating to 95 ℃ for 30min to completely gelatinize the cationic starch;
2) uniformly mixing the cationic starch pasting solution, 10 wt% dialdehyde chitosan water solution and distilled water according to the mass ratio of 1:3:10, continuously stirring and heating at 95 ℃ for 1h to obtain the dialdehyde chitosan/cationic starch composite sizing agent.
After the cationic starch sizing agent is applied to the surface of the kitchen paper, a certain degree of crosslinking is generated among dialdehyde chitosan, cationic starch and kitchen paper cellulose to form a film layer, the porosity is reduced, condensation reaction is generated among the dialdehyde chitosan, the cationic starch and the cellulose, the crosslinking degree is obviously increased, and a relatively flat coating is formed on the surface of the kitchen paper, so that the mechanical property is enhanced, the tensile index and the tearing index are improved, and the toughness of the kitchen paper is favorably improved.
In this embodiment, the method for preparing the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate of the present invention includes:
1) adding 28 parts by weight of castor oil, 2.5 parts by weight of isophorone diisocyanate, 10 parts by weight of butyl acrylate and 4 parts by weight of styrene into a dry three-neck flask with a stirrer, uniformly mixing, heating the system to 78 ℃, reacting for 2.5 hours, and then cooling to 70 ℃;
2) adding 0.8 weight part of N-methyl-diethanolamine, 2.0 weight parts of 1, 4-butanediol, 14 weight parts of epoxy resin E-44 and 0.4 weight part of catalyst stannous octoate, and carrying out chain extension and crosslinking reaction for 5 hours; cooling the system to 30 ℃, adding a neutralizing agent glacial acetic acid in a certain proportion, and continuously stirring for 30 min;
3) slowly adding equivalent ice water into the system under high-speed stirring for dispersing and emulsifying to prepare a cationic waterborne polyurethane emulsion, taking the cationic waterborne polyurethane emulsion as a seed emulsion, and heating to 75 ℃;
4) and (3) dropwise adding 3 parts by weight of aqueous azodiisobutyl amidine hydrochloride aqueous solution initiator into the system, continuing to perform heat preservation reaction for 4 hours after dropping for 2 hours to obtain the semitransparent epoxy resin modified castor oil based cationic aqueous polyurethane-acrylate composite emulsion.
The average particle size of the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate is 40-100 nm.
The epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate emulsion has higher crosslinking degree, can form a more compact crosslinked network structure, can endow the kitchen paper base paper with further improved water resistance due to the introduction of the epoxy resin, and forms a compact network structure due to the crosslinking of chemical bonds among molecules during polymerization reaction, so that the interaction force among molecules is increased, the distance among molecular chains is reduced, and a waterproof coating is formed on the surface of the paper, so that the penetration of water into the paper can be effectively prevented, and the sizing kitchen paper base paper has excellent hydrophobicity; the emulsion combines the advantages of epoxy resin and polyurethane-acrylate composite emulsion, has better bonding strength, and can endow paper with necessary surface strength, tensile strength and bursting strength when sizing.
The composite sizing agent for the base paper of the kitchen paper is a quaternary composite sizing system consisting of an anionic rosin sizing agent, a cationic starch sizing agent, epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate and a sizing agent reinforcing agent, the system has excellent cadmium oil resistance and film forming property, so that the surface of the kitchen paper with oil stains, water stains and other dirt can keep high oil absorption and water absorption characteristics, and the composite sizing liquid layer can completely prevent the oil stains, the water stains and other dirt from migrating and infiltrating to a hand-held surface, so that the hand-held surface is kept dry and clean; in addition, the sizing liquid reinforcing agent is beneficial to inhibiting the bacterial growth on the surface of the kitchen paper stained with dirt such as oil stain and the like while strengthening the water-resisting cadmium oiliness and film-forming property of the composite sizing system, delaying the rotten degree of the surface of the used kitchen paper, reducing the odor pollution and improving the cleanliness of a kitchen area.
The embodiment also provides a kitchen paper prepared by applying the composite sizing solution, which comprises the following components:
-an upper base paper comprising an upper surface layer and a lower surface layer;
-a hollow layer;
-a size layer;
-a hollow layer;
-a lower base paper comprising an upper surface layer and a lower surface layer;
wherein the sizing layer is the composite sizing liquid.
The upper layer base paper and the lower layer base paper comprise an upper surface layer and a lower surface layer, and the two lower surface layers of the upper layer base paper and the lower layer base paper are oppositely arranged.
The hollow layer of the upper layer body paper is arranged between the lower surface layer of the upper layer body paper and the sizing layer, and the adjacent hollow layers are isolated.
The hollow layer of the lower layer base paper is arranged between the sizing layer and the lower surface layer of the lower layer base paper, and the adjacent hollow layers are isolated.
The hollow layers are dotted between the lower surface layer of the upper base paper and the sizing layer and between the sizing layer and the lower surface layer of the lower base paper.
The top coat slurry comprises 80 wt% bleached hardwood chemical slurry and 20 wt% long fiber slurry; the lower skin slurry comprised 30 wt% bleached softwood chemical slurry and 70 wt% fluff slurry.
The long fiber pulp is prepared by adjusting the concentration of long fibers in raw wood pulp to 30 wt%, and performing pulp dispersing treatment on the long fibers for 3 hours by using a pulping machine to ensure that the beating degree of the long fibers is 25 DEG SR.
The short fiber pulp is prepared by adjusting the concentration of short fibers in raw wood pulp to 50 wt%, and defibering the short fibers for 4 hours by using a defibering machine, wherein the power is 200kW, and the rotating speed is 1200 rpm.
The bleached hardwood chemical pulp and the long fiber pulp are used as upper surface layers and are in direct contact with consumers, and the lower fiber length, the lower fiber thickness and the higher beating degree of the long fibers bring better smoothness and softness of the surface of the finished paper, so that the use experience is improved; the bleached softwood chemical pulp and the short fiber pulp with higher fluffiness endow the lower surface layer with a compact outer surface layer, the surface strength is high, the phenomena of hair and powder falling are prevented, the secondary pollution on the surface of an object in the wiping process is reduced, the short fibers have more fine fiber content, a larger specific surface area of the fiber surface is brought, a better water absorption and locking function is brought for paper pages, and the prepared paper for the kitchen cannot cause rewet to pollute the hands under the action of gravity wiping.
The hollow layer arranged between the lower surface layer of the upper layer body paper and the sizing layer is beneficial to increasing the comfort level of a user for gripping the kitchen paper by a palm, improving the softness of the paper and improving the use hand feeling and experience; the hollow layer arranged between the sizing layer and the lower surface layer of the lower layer body paper is beneficial to storing sewage, oil stain and other dirt absorbed by the lower layer body paper, the dirt absorbing capacity of the kitchen paper is increased, the sewage, the oil stain and other dirt are prevented from dropping and diffusing, and the cleaning efficiency of the kitchen paper is improved; in addition, two-layer hollow layer still is favorable to promoting the temperature insulating effect of kitchen paper, reduces heat transmission efficiency, uses the kitchen paper to wipe the higher object of temperature when the consumer, can avoid high temperature to conduct rapidly to kitchen paper top layer, reduces the risk that the consumer was scalded, guarantees safety.
The embodiment also provides a method for preparing the kitchen paper, which specifically comprises the following steps:
a pulping step: pulping bleached hardwood chemical pulp, long fiber pulp, bleached softwood chemical pulp and short fiber pulp respectively;
a slurry mixing step: bleached hardwood chemical pulp and long fiber pulp are used as upper surface pulp, and bleached softwood chemical pulp and short fiber pulp are used as lower surface pulp;
a paper forming step: the slurry is passed through a double-layer pulp flowDewatering, squeezing, drying and coiling on a net in a box, wherein the papermaking quantitative is 15 +/-2 g/m2Base paper;
an embossing step: embossing the lower surface layer of the base paper to form the shape of a hollow layer;
a sizing and pressing step: applying the composite sizing solution of the embodiment on the lower surface layer of the upper layer base paper or the lower layer base paper, and then pressing to obtain formed kitchen paper;
a post-treatment step: the kitchen paper is obtained by rolling, cutting, sterilizing and packaging the formed kitchen paper.
The pulping operation of the bleached hardwood chemical pulp is specifically as follows: the bleached hardwood chemical pulp is beaten in a disc grinding sticky state, fibers are broomed as much as possible, the pulp concentration is 30 wt%, and the pulp beating degree is controlled to be 20 DEG SR.
The pulping operation of the long fiber pulp specifically comprises the following steps: adjusting the concentration of the long fibers in the primary wood pulp to 30 wt%, and performing pulp dispersing treatment on the long fibers for 3 hours by using a pulp grinder to enable the beating degree to be 25 DEG SR.
The pulping operation of the short fiber pulp specifically comprises the following steps: adjusting the concentration of short fibers in the raw wood pulp to 50 wt%, and carrying out defibering treatment on the short fibers for 4 hours by using a defibering machine, wherein the power is 200kW, and the rotating speed is 1200 rpm.
The pulping operation of the bleached softwood chemical pulp specifically comprises the following steps: and (3) grinding the bleached softwood chemical pulp by a disc mill to carry out free pulping, properly cutting off the bleached softwood chemical pulp on the basis of full defibering, controlling the pulp concentration to be 30 wt%, and controlling the beating degree of the pulp to be 28 DEG SR.
The prepared kitchen paper solves the problem of hand pollution caused by wetting of the traditional kitchen paper by water or oil, avoids secondary or repeated wiping caused by wetting of the kitchen paper in the cleaning process, simultaneously endows the kitchen paper with a bacteriostatic action, inhibits the breeding of harmful bacteria such as fungi and mold on the surface of the kitchen paper which is full of dirt such as oil stain and the like, delays the rotten degree of the surface of the used kitchen paper, reduces odor pollution, improves the cleanliness of a kitchen area, greatly optimizes the use experience, does not need to add a new process, and has the advantages of simple production process, no environmental pollution, continuous large-scale industrial production and the like.
Example 2:
example 2 is substantially the same as example 1 except that in example 2, the hollow layers are present in the form of a strip between the lower surface layer of the upper base paper and the size layer and between the size layer and the lower surface layer of the lower base paper.
Example 3:
example 3 is substantially the same as example 1 except that in example 3, the hollow layers are present in a band shape between the lower surface layer of the upper base paper and the sizing layer and between the sizing layer and the lower surface layer of the lower base paper.
Example 4:
example 4 is substantially the same as example 1 except that in example 4, the hollow layers are present in an arc shape between the lower surface layer of the upper base paper and the sizing layer and between the sizing layer and the lower surface layer of the lower base paper.
Example 5:
example 5 is substantially the same as example 1 except that in example 5, the hollow layer is present in a dot shape between the lower surface layer of the upper base paper and the size layer and in a belt shape between the size layer and the lower surface layer of the lower base paper.
Example 6:
example 6 is substantially the same as example 1 except that in example 6, the hollow layer is present in a strip shape between the lower surface layer of the upper base paper and the sizing layer and in an arc shape between the sizing layer and the lower surface layer of the lower base paper.
Example 7:
examples 7 to 10 are basically the same as example 1 except that the base papers of examples 7 to 10 are different from example 1 in the ratio of the slurries of the upper and lower surface layers, and the differences are shown in table 1.
Table 1, slurry mixing ratio of upper and lower surface layers of examples 7 to 10
Note: in examples 7 to 10, the bleached hardwood chemical pulp, the long fiber pulp, the bleached softwood chemical pulp and the short fiber pulp were prepared by the same method as in example 1; the weight percentage indicates the weight percentage of the indicated pulp in the top paper, and "0 wt%" indicates that the pulp is not contained, i.e., the weight percentage of the pulp in the top paper is 0 wt%.
Comparative examples V11 to V17:
comparative examples V11-V17 are substantially the same as example 1 except that the sizing-fluid-reinforcing agent in the composite sizing fluid of comparative examples V11-V17 is different from example 1 by the differences shown in Table 2.
The components of the sizing liquid reinforcing agent in the table 2 and the comparative examples V11-V17 are proportioned
| Comparative example | Pyridine compound and weight portion thereof | Polysorbate and its weight portion | Carboxymethyl cellulose and parts by weight thereof |
| V11 | / | 5 | 24 |
| V12 | 1 | / | 24 |
| V13 | 1 | 5 | |
| V14 | 1 | / | / |
| V15 | / | 1 | / |
| V16 | / | / | 1 |
| V17 | / | / | / |
Note: in Table 2 concerning comparative examples V11 to V17, "/" indicates that the content of the ingredient in the size enhancer without the ingredient is 0% by weight.
Experimental example 1:
the standardization index of the kitchen paper in examples 1-10 and comparative examples V11-V17 of the present invention was tested according to GB/T26174-2010, each index was repeated 5 times, and the test results are shown in tables 3 and 4.
TABLE 3 technical index of kitchen paper
TABLE 4 microbiological index of kitchen paper
As can be seen from the graph shown in Table 3, the kitchen paper in the preferred embodiments 1-6 of the present application satisfies the national standard GB/T26174-2010 in terms of paper whiteness, transverse moisture absorption height, tensile index, holes, dust and moisture, however, when the slurry components and the mixture ratio of the upper and lower surface layers of the kitchen paper are changed, some indexes such as the moisture absorption height and the tensile index fail to reach the standard, which indicates that the indexes of the kitchen paper prepared according to the present application are relatively stable, and when the formula of the sizing agent reinforcing agent used for the kitchen paper is incomplete (comparative examples V11-V17), the moisture absorption height and the tensile index of the kitchen paper are found to be greatly reduced, which indicates that the sizing agent reinforcing agent used for the present application has important significance for the physical mechanical index of the kitchen paper.
As can be seen from the graphs in Table 4, the kitchen paper in examples 1-10 of the present application all meet the requirements of national standard GB/T26174-2010 on microorganisms of the kitchen paper, but when the formula of the sizing agent reinforcing agent for the kitchen paper is not complete (comparative examples V11-V17), the microorganisms in the kitchen paper partially do not meet the standards or partially exceed the limits of the national standard, which indicates that the sizing agent reinforcing agent containing the pentafluoroethyl substituted pyridine compound, the polysorbate and the carboxymethyl cellulose and compatible with the three compounds has excellent inhibitory effect on the microorganisms in the kitchen paper.
Experimental example 2:
the inhibition effect of the kitchen paper on microorganisms in the paper after oil and water stains are wiped is detected.
The kitchen paper in the embodiments 1-10 and the comparative examples V11-V17 of the application is used for wiping oil stains on the surface of the range hood of the household kitchen, the indoor environment is kept still for 5 hours, then the microbial content of the kitchen paper is detected according to the national standard GB/T26174-containing 2010, and the commercial kitchen paper is used as a reference. The microbial content of all 18 kitchen paper samples was counted in table 5. As can be seen from table 5, the kitchen paper in the preferred embodiments (examples 1 to 6) of the present application has a significant inhibitory effect on the growth and propagation of kitchen oily microorganisms, while when the formulation of the sizing agent enhancer for kitchen paper is not complete (comparative examples V11 to V17), it is found that the microorganisms in the kitchen paper significantly exceed those in the preferred embodiments, and it is described that the sizing agent enhancer containing a pentafluoroethyl-substituted pyridine compound, polysorbate, and carboxymethyl cellulose and compatible with the three compounds has a significant inhibitory effect on the growth and propagation of microorganisms in the kitchen paper, which is advantageous for inhibiting the growth of harmful bacteria such as fungi and mold on the surface of the kitchen paper contaminated with dirt such as oil stains, delaying the degree of deterioration of the surface of the used kitchen paper, reducing odor pollution, and improving the cleanliness of the kitchen area.
TABLE 5 microbial content of kitchen paper after oil stain wiping
| Index (I) | Total number of bacterial colonies | Coliform group bacteria | Pseudomonas aeruginosa | Staphylococcus aureus | Hemolytic streptococcus | Total number of fungal colonies |
| Unit of | CFU/g | CFU/g | CFU/g | CFU/g | CFU/g | CFU/g |
| Control group | 2.6×104 | 4506.5 | 2590.8 | 2895.5 | 2156.0 | 5905.2 |
| Example 1 | 325.5 | 205.6 | 159.5 | 185.0 | 109.5 | 306.5 |
| Example 2 | 305.2 | 185.5 | 140.2 | 220.5 | 75.6 | 305.2 |
| Example 3 | 352.6 | 206.2 | 133.6 | 210.6 | 153.2 | 256.2 |
| Example 4 | 308.5 | 195.5 | 195.0 | 251.6 | 162.5 | 251.0 |
| Example 5 | 300.5 | 162.5 | 185.2 | 241.6 | 140.2 | 216.3 |
| Example 6 | 395.2 | 120.2 | 205.6 | 175.6 | 112.6 | 205.5 |
| Example 7 | 356.8 | 165.5 | 216.2 | 246.2 | 115.2 | 265.5 |
| Example 8 | 365.0 | 192.5 | 235.6 | 231.5 | 142.5 | 298.5 |
| Example 9 | 352.0 | 265.0 | 185.6 | 241.6 | 145.9 | 356.2 |
| Example 10 | 346.8 | 305.0 | 195.2 | 253.2 | 160.0 | 340.2 |
| Comparative example V11 | 1256.2 | 485.6 | 265.2 | 326.5 | 265.2 | 455.5 |
| Comparative example V12 | 1326.0 | 521.6 | 295.8 | 346.2 | 245.2 | 495.8 |
| Comparative example V13 | 1305.5 | 359.2 | 265.2 | 398.5 | 298.5 | 400.5 |
| Comparative example V14 | 1925.6 | 542.6 | 284.4 | 452.5 | 389.5 | 695.5 |
| Comparative example V15 | 2058.5 | 598.5 | 398.5 | 495.5 | 387.2 | 705.5 |
| Comparative example V16 | 2095.8 | 685.2 | 395.2 | 508.2 | 402.0 | 745.5 |
| Comparative example V17 | 2550.5 | 885.2 | 590.5 | 752.7 | 605.0 | 1080.5 |
Conventional techniques in the above embodiments are known to those skilled in the art, and therefore, will not be described in detail herein.
The above embodiments are merely illustrative, and not restrictive, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (9)
1. The composite sizing agent for the base paper for the kitchen is characterized by being prepared from the following components in percentage by mass:
wherein the cationic waterborne polyurethane-acrylate is epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate;
the sizing liquid reinforcing agent is a mixture comprising pentafluoroethyl substituted pyridine compounds shown as a formula (1), polysorbate and carboxymethyl cellulose;
2. the composite sizing solution according to claim 1, characterized in that: the sizing liquid reinforcing agent is a mixture of pentafluoroethyl-substituted pyridine compounds shown in a formula (1), polysorbate and carboxymethyl cellulose, and the weight ratio of the pentafluoroethyl-substituted pyridine compounds to the polysorbate to the carboxymethyl cellulose is 1: 5-8: 22-25.
3. The composite sizing solution according to claim 1 or 2, characterized in that: the particle size of the anionic rosin sizing agent is 0.05-0.15 mu m.
4. The composite sizing solution according to claim 1 or 2, characterized in that: the average particle size of the epoxy resin modified castor oil based cationic waterborne polyurethane-acrylate is 40-100 nm.
5. Kitchen paper prepared by using the composite sizing liquid of any one of claims 1 to 4, which is characterized by comprising:
-an upper base paper comprising an upper surface layer and a lower surface layer;
-a hollow layer;
-a size layer;
-a hollow layer;
-a lower base paper comprising an upper surface layer and a lower surface layer;
wherein the sizing layer is the composite sizing liquid as defined in any one of claims 1 to 4.
6. The kitchen paper according to claim 5, characterized in that: the upper layer base paper and the lower layer base paper comprise an upper surface layer and a lower surface layer, and the two lower surface layers of the upper layer base paper and the lower layer base paper are oppositely arranged.
7. The kitchen paper according to claim 5 or 6, characterized in that: the hollow layer is in a dot shape and/or a strip shape and/or a belt shape and/or an arc shape and is arranged between the lower surface layer of the upper layer base paper and the sizing layer and/or between the sizing layer and the lower surface layer of the lower layer base paper.
8. A method for preparing the kitchen paper as claimed in any one of claims 5 to 7, characterized by comprising the following steps:
a pulping step: pulping bleached hardwood chemical pulp, long fiber pulp, bleached softwood chemical pulp and short fiber pulp respectively;
a slurry mixing step: bleached hardwood chemical pulp and long fiber pulp are used as upper surface pulp, and bleached softwood chemical pulp and short fiber pulp are used as lower surface pulp;
a paper forming step: the evenly mixed pulp is dewatered, pressed, dried and coiled on a double-layer pulp flowing box, and the papermaking quantitative is 15 +/-2 g/m2Base paper;
an embossing step: embossing the lower surface layer of the base paper to form the shape of a hollow layer;
a sizing and pressing step: applying the composite sizing solution according to any one of claims 1 to 4 on the lower surface layer of an upper layer base paper or a lower layer base paper, and then pressing to obtain formed kitchen paper;
a post-treatment step: the kitchen paper is obtained by rolling, cutting, sterilizing and packaging the formed kitchen paper.
9. The method of claim 8, wherein:
the pulping operation of the bleached hardwood chemical pulp is specifically as follows: carrying out disc grinding and sticky pulping on the bleached hardwood chemical pulp, brooming fibers as much as possible, controlling the pulp concentration to be 25-50 wt%, and controlling the pulp beating degree to be 15-20 DEG SR;
the pulping operation of the long fiber pulp specifically comprises the following steps: adjusting the concentration of long fibers in the primary wood pulp to 25-50 wt%, and performing pulp dispersing treatment on the long fibers for 3-4 hours by using a pulp grinder to enable the beating degree to be 22-25 DEG SR;
the pulping operation of the short fiber pulp specifically comprises the following steps: adjusting the concentration of short fibers in the primary wood pulp to 40-60 wt%, and carrying out defibering treatment on the short fibers for 2-4 hours by using a defibering machine, wherein the power is 180-250 kW, and the rotating speed is 1000-1500 rpm;
the pulping operation of the bleached softwood chemical pulp specifically comprises the following steps: and (3) grinding the bleached softwood chemical pulp in a disc mill to carry out free pulping, properly cutting off the bleached softwood chemical pulp on the basis of full defibering, wherein the pulp concentration is 25-50 wt%, and the beating degree of the pulp is controlled to be 22-28 DEG SR.
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