CN119265999A - A heat-sealing coating composition for paper products and its application - Google Patents
A heat-sealing coating composition for paper products and its application Download PDFInfo
- Publication number
- CN119265999A CN119265999A CN202411486473.7A CN202411486473A CN119265999A CN 119265999 A CN119265999 A CN 119265999A CN 202411486473 A CN202411486473 A CN 202411486473A CN 119265999 A CN119265999 A CN 119265999A
- Authority
- CN
- China
- Prior art keywords
- parts
- component
- coating
- coating composition
- mass
- 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.)
- Pending
Links
Landscapes
- Paper (AREA)
Abstract
The invention belongs to the field of paper products, and particularly relates to a heat-sealing coating composition for paper products and application thereof, wherein the coating composition comprises a component A, a component B and a component C, wherein the component A comprises one or two of a biomass material with a dendritic or network-shaped structure or a cationized biomass material with a dendritic or network-shaped structure; component B is one, two or more selected from polyhydroxyalkanoate, alkyl ketene dimer, polyglycolide, polylactide, copolymer of butanediol adipate and butanediol terephthalate, cellulose ester and cellulose ether, and component C is one, two or more selected from thermoplastic cellulose and derivatives thereof, thermoplastic starch, rosin, cardanol-based epoxy resin, epoxidized soybean oil, epoxidized castor oil, tannic acid and malic acid. The coating composition disclosed by the invention is simple in preparation process, easy to industrialize, low in production cost, energy-saving and environment-friendly, and the target mixture can be obtained through physical blending.
Description
Technical Field
The invention belongs to the field of paper products, and particularly relates to a heat-sealing coating composition for paper products and application thereof.
Background
As ecological problems become more serious, environmental protection becomes a mainstream value, and plastic packaging is gradually limited due to incomplete recyclability and biodegradability, which results in serious ecological problems. Paper products are becoming more and more important in the packaging field. However, the paper products lack heat sealing property, and at present, heat sealing coatings formed by materials such as polypropylene, polyethylene and the like are covered on the surfaces of the paper products by means of film covering, film spraying or coating and the like, so that the paper products have barrier property and heat sealing property, and the plastic packaging is replaced. The paper with the heat-sealing coating has higher mechanical strength (improving tearing resistance and abrasion resistance), and after heat sealing, a firm sealing space can be formed, the content (food, medical supplies or other products which are easily affected by the environment) in the sealing space is prevented from leaking, the integrity of the package is maintained, and the outside air and moisture can be effectively isolated, so that the shelf life of the content is prolonged.
However, polypropylene, polyethylene and other materials are petroleum-based materials, which are difficult to degrade naturally, and the formed microplastic is difficult to metabolize if entering human body, so that various diseases are easy to be induced, and great harm is caused to human health. At present, a heat-sealing coating structure is mainly formed by adopting a degradable high polymer material to replace petroleum-based materials. For example, patent document CN103774490a discloses a method of coating polylactic acid particles on paper surface and then hot-pressing to form a film, but the barrier property of polylactic acid film is inferior to that of conventional non-degradable polypropylene, polyethylene and poly (p-xylylene glycol) ester (PET) film, and it is necessary to further improve the barrier property. Patent document CN107687111a pretreats PLA fibers with cationic guar gum, while improving the strength of bamboo fiber/PLA fiber paper to some extent, the paper strength has a certain gap from the actual packaging requirements. In addition, the polylactic acid adopted by the method and the PLA fiber pretreated by the cationic guar gum have higher cost and complex production process.
In order to reduce the production difficulty and cost, the technology of coating the surface of the paper is further developed, and the paper is additionally protected by the coating, so that the mechanical strength, heat sealability, water resistance, oil resistance, antibacterial property and the like of the paper are improved. However, the conventional coating composition for providing a coating layer tends to deform paper when the coating amount is large, and the coating layer tends to have poor results such as coating lines and pinholes due to poor leveling property caused by an increase in viscosity of the coating material when the solid content is high (> 20%), while it is difficult to achieve the purpose of improving the performance of paper products when the coating amount is low.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a heat-sealing coating composition for paper products, which has the characteristics of green and non-toxicity, biodegradability, good water resistance and good heat-sealing performance. This object is achieved by a heat-seal coating composition for paper products, said coating composition comprising:
One or two of biomass materials with dendritic or network-like structures or cationized biomass materials with dendritic or network-like structures;
component B, one, two or more selected from PHA (polyhydroxyalkanoate), AKD (alkyl ketene dimer), PGA (polyglycolide), PLA (polylactide), PBAT (copolymer of butylene adipate and butylene terephthalate), cellulose esters and cellulose ethers, for example, a combination of PHA and AKD;
and a component C which is one, two or more of thermoplastic cellulose derivatives, starch substances, rosin, cardanol-based epoxy resin, epoxidized soybean oil, epoxidized castor oil, tannic acid and malic acid.
According to a preferred embodiment of the present invention, the heat-seal coating composition consists of the component a, component B and component C.
According to the embodiment of the invention, the coating composition comprises, by weight, 5-20 parts of a component A, 25-50 parts of a component B and 15-40 parts of a component C, preferably 5-20 parts of the component A, 25-50 parts of the component B and 15-40 parts of the component C, wherein the component B and the component C are emulsions.
As an example, the component a is biomass having a dendritic or network-like structure.
As another example, the component a is a cationized biomass material having a dendritic or network-like structure.
As another example, the component a consists of a biomass having a dendritic or network-like structure and a cationized biomass material having a dendritic or network-like structure.
According to the embodiment of the invention, the component A is a mixture of 5-15 parts by weight of biomass with a dendritic or network structure and 5-15 parts by weight of cationized biomass material with a dendritic or network structure, preferably 10-15 parts by weight of biomass with a dendritic or network structure and 8-15 parts by weight of cationized biomass material with a dendritic or network structure.
According to embodiments of the present invention, the thermoplastic cellulose derivatives include, but are not limited to, cellulose ethers such as methyl cellulose, carboxymethyl cellulose, cellulose esters such as cellulose acetate, cellulose acetate butyrate.
According to embodiments of the present invention, the starch-based material includes, but is not limited to, one, two or more of tapioca starch, potato starch, corn starch, lotus root starch, oxidized starch, oil-resistant starch, and the like.
According to the embodiment of the invention, the component B comprises one or more of 20-50 parts by mass of PHA emulsion with the mass fraction of 35%, 2-15 parts by mass of AKD emulsion with the mass fraction of 10%, 5-30 parts by mass of PLA emulsion with the mass fraction of 20%, 10-30 parts by mass of PGA emulsion with the mass fraction of 25%, 5-25 parts by mass of PBAT emulsion with the mass fraction of 35%, 3-15 parts by mass of cellulose ester emulsion with the mass fraction of 30% or cellulose ether emulsion, wherein an emulsifier of the emulsion is Tween 80 or span 80, the using amount of the emulsifier is 3% -5% of the mass of a dispersion medium, and the dispersing agent is water.
According to the embodiment of the invention, the component C comprises 20-40 parts by mass of thermoplastic cellulose emulsion (ethyl cellulose, cellulose acetate, carboxymethyl cellulose and the like) with the mass fraction of 2-10 parts by mass of thermoplastic starch emulsion with the mass fraction of 5%, 2-15 parts by mass of rosin emulsion with the mass fraction of 25%, 15-35 parts by mass of epoxy vegetable oil (epoxy soybean oil or epoxy castor oil), 5-15 parts of polybasic acid (malic acid or tannic acid) or at least comprises the combination of two or more of thermoplastic cellulose, thermoplastic starch or epoxy vegetable oil and polybasic acid, the emulsifier of the emulsion in the component C is 80 or span 80, the amount of the emulsifier is 3-5% of the mass of the dispersion medium, and the dispersing agent of the emulsion is water.
According to the embodiment of the invention, the coating composition further comprises auxiliary materials in parts by mass, preferably the coating composition further comprises 3-15 parts of auxiliary materials, and more preferably 5-10 parts of auxiliary materials.
According to an embodiment of the present invention, the auxiliary material is selected from one, two or more of montmorillonite, bentonite, polyaluminum chloride, polyethylenimine, alum, soy protein isolate, defoamer, bactericide.
The invention also provides a preparation method of the coating composition slurry, which comprises the following steps:
And mixing the coating composition with a solvent, and then treating the mixture for 0.5 to 2 hours under ultrasonic or vacuum conditions to obtain coating composition slurry.
According to an embodiment of the invention, the solvent is deionized water.
According to the embodiment of the invention, the temperature of the mixing is 30-50 ℃.
According to an embodiment of the invention, the mixing is performed under stirring.
According to an embodiment of the invention, the stirring is carried out at a speed of 800 to 3000rpm for a time of 30 to 120min, for example at a speed of 1000rpm for 30min.
According to an embodiment of the invention, the preparation method comprises the steps of:
1) Mixing the component A, the component B, the component C, the auxiliary materials and water, and dispersing at a high speed for 30-120 min at a temperature of 30-50 ℃ and a rotating speed of 800-3000 rpm to obtain a mixture;
2) And (3) treating the mixture for 0.5-2 hours under ultrasonic or vacuum conditions to obtain the coating mixture slurry.
According to an embodiment of the present invention, the solid content in the coating mixture slurry is 10-80%, preferably the solid content in the coating mixture slurry is 20-75%, and the viscosity at the solid content in the coating mixture slurry is 30%, 50%, 70%, 80% is 22s, 33s, 42s, 51s, respectively, as measured by a coating-4 viscosimeter.
The invention also provides application of the coating composition as a heat-sealing coating of paper products.
According to an embodiment of the invention, the paper product comprises base paper and paper plastic finished product.
According to an embodiment of the invention, the paper product end product is for example a paper cup, a packaging bag.
The invention also provides a method for applying the heat-seal coating composition to the surface of a paper product, comprising the steps of:
A slurry of the heat seal coating composition described above is applied to at least one surface of a paper product material capable of forming a substrate to form a heat seal coating.
According to an embodiment of the invention, the coating is selected from the coating means conventional in the art, such as for example machine coating or spray coating.
According to an embodiment of the present invention, after the surface of the material capable of forming a substrate is coated with the aqueous coating, a step of drying, which includes at least one of drying or hot pressing, is further included.
According to the embodiment of the invention, the machine coating comprises the following steps of placing a paper product material forming a base material on a coating machine, selecting a wire rod with the thickness of 20-80 mu m, coating at the coating speed of 5-20 mm/min and the coating temperature of 30-50 ℃, coating the surface of the paper product material with coating mixture slurry with the solid content of 30-75%, and naturally drying for 20-40 min or drying for 10-20 min by a blast drying box after coating.
According to the embodiment of the invention, the spraying comprises the following steps of adding the composition with the solid content of 15-45% into a spray gun, uniformly spraying for 2-3 times by using the spray gun, wherein the spraying pressure is 0.25-0.65 mpa, and naturally drying for 15-35 min or drying for 8-20 min by using a forced air drying box after spraying.
The invention also provides a paper product with the heat-seal coating, which comprises a substrate and the heat-seal coating on at least one surface of the substrate.
According to an embodiment of the invention, the pulp product is a paper product, such as a paper cup.
Advantageous effects
1) The coating composition has good leveling property when the solid content in the coating composition is 10-80%, and can endow the paper product with heat sealing property, and compared with the poor results of coating lines, pinholes and the like in the prior art, the coating composition has good leveling property when the solid content reaches more than 30%, and the obtained coating has no defects of coating lines, pinholes and the like.
2) The coating composition provided by the invention has the advantages that the surface after coating has a good water blocking effect due to the strong hydrophobicity and film forming property of the component B, the surface of the coating can show a lotus leaf effect, and the minimum Cobb 1800 can reach 10g/m 2.
3) The coating composition has excellent heat sealing performance, certain plasticizing effect, and when the base material has one heat sealing coating, the component C may be melted at certain temperature and pressure and enter the micropores of the base material without heat sealing coating in viscous state to form wedge adhesion after cooling and solidification.
4) The paper products prepared by the coating composition can realize good heat sealing performance at the heat sealing temperature of 145-260 ℃ and the heat sealing pressure of 0.2-0.6 mpa, and the heat sealing strength can reach 12-18N/15 mm.
5) The coating composition disclosed by the invention is simple in preparation process, easy to industrialize, low in production cost, energy-saving and environment-friendly, can be used for obtaining a target mixture through physical blending, and has good water resistance and heat sealability, thus having a wide application prospect in the field of paper products.
Drawings
FIG. 1 is an electron microscopic view of a biomass material having a dendritic or network-like structure used in example 1;
FIG. 2 is an enlarged view of FIG. 1;
FIG. 3 is an electron microscopy image of a cationized dendritic or network-like structure of biomass material used in example 2;
FIG. 4 is an enlarged view of FIG. 3;
FIG. 5 is a graph showing the difference in water blocking properties of the paper-based material before and after the coating composition slurry of example 4 was applied;
Fig. 6 is a graph showing heat sealing effects of paper-based materials before and after the coating composition slurry was applied in example 4.
Detailed Description
[ Structure of Biomass Material having dendritic or network-like Structure ]
The biomass material with the dendritic or network-like structure comprises a micron-sized structure and a nano-sized structure distributed on the micron-sized structure.
According to an embodiment of the invention, the biomass material with dendritic or network-like structure is a regenerated natural polymer (e.g. type II cellulose, or a mixture of type II cellulose and type I cellulose) comprising a micro-scale structure and a nano-scale structure distributed over the micro-scale structure.
According to an embodiment of the present invention, the size (i.e., volume average size) of the micro-scale structure is 50 μm to 500 μm, preferably the size of the micro-scale structure is 50 μm to 300 μm, further preferably the size of the micro-scale structure is 100 μm to 200 μm, for example, any value of 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm or any point value among intermediate values composed of any two point values.
According to an embodiment of the present invention, the length of the nano-scale structure is 50nm to 800nm, preferably the length of the nano-scale structure is 100nm to 500nm, and more preferably the length of the nano-scale structure is 200nm to 400nm, for example, any value of 50nm, 60nm, 70nm, 80nm, 90nm, 100nm, 110nm, 120nm, 130nm, 140nm, 150nm or any point value of intermediate values composed of any two point values.
According to an embodiment of the present invention, the aspect ratio of the nanoscale structure is 1:1 to 1:150, preferably the aspect ratio of the nanoscale structure is 1:1 to 1:100, more preferably the aspect ratio of the nanoscale structure is 1:10 to 1:100, for example, 1:50.
According to an embodiment of the invention, the microscale structure comprises at least one of a microsheet, a microfiber, and a microscale structure.
According to embodiments of the present invention, the microscale structure is fibrous or membranous, which may also be referred to as brooming.
According to an embodiment of the invention, the nano-scale structures are distributed on the surface and/or edges of the micro-scale structures. In particular, the nano-scale structures are densely distributed at the surface and/or edges of the micro-scale structures.
According to an embodiment of the invention, the nano-scale structures are distributed over the micro-scale structures to form flocs as a whole.
According to an embodiment of the present invention, the nano-sized structures are distributed on the micro-sized structures to be integrally formed to have a porous sponge-like structure.
According to an embodiment of the invention, the nanoscale structures and the microscale structures together form a feathered structure.
According to embodiments of the present invention, the nanoscale structures are villiated, tentacle-like, or other irregular structures.
According to an embodiment of the invention, the biomass material is in a fibrous, sheet, plume, dendritic, flocculent or porous sponge-like structure.
[ Preparation of Biomass Material having dendritic or network-like Structure ]
The preparation method is selected from a first method or a second method, wherein the first method comprises the following steps:
dissolving biomass in a solvent to form a biomass solution;
Adding the biomass solution and the coagulating bath into a crushing device, and mechanically crushing the biomass solution and the coagulating bath while mixing to prepare the bio-based material, or filtering and washing the bio-based material after the mechanical crushing treatment to prepare the biomass material with the dendritic or network structure;
the second method comprises the steps of pouring a biomass solution into a coagulating bath to form biomass gel, and carrying out micro-nano treatment on the biomass gel through mechanical crushing treatment to obtain the biomass material with the dendritic or network structure.
According to an embodiment of the invention, the reagent used in the washing steps in method one and method two is selected from at least one of water, alcohol-water mixture, aqueous HCl, aqueous NaOH, aqueous inorganic salt solution, preferably water and/or alcohol, for example water.
According to an embodiment of the invention, the biomass is derived from one, two or more of cellulose or derivatives thereof (e.g. ethylcellulose, carboxymethyl cellulose, cellulose acetate), starch or derivatives thereof (e.g. oxidized starch, modified oil resistant starch), chitosan or derivatives thereof (e.g. carboxymethyl chitosan, chitin), alginate.
According to an embodiment of the invention, the biomass is selected from at least one of lignin, dextran, hemicellulose, straw, plant stems and leaves, reed, bagasse, chinese medicine residues, tea leaves residues, corncob, fruit shells, vines, branches, etc.
For example, the biomass is at least one selected from microcrystalline cellulose, bacterial cellulose, lignin, cotton pulp, wood pulp, bamboo pulp, grass pulp, purified cotton, absorbent cotton, cotton linters, bagasse, wood, straw, and the like, and preferably one or more of microcrystalline cellulose, purified cotton, absorbent cotton, and wood pulp.
According to embodiments of the present invention, the solvent that dissolves the biomass may be selected from any good solvent known in the art that is capable of completely dissolving the biomass. Preferably, the solvent is selected from one or more of organic solvents, ionic liquids, mixed solvents of ionic liquids and organic solvents, choline type ionic liquid eutectic solvent systems, organic solvent/salt systems, amine oxide systems (NMMO), carbamate systems, alkali/water systems, alkali/urea systems, alkali/thiourea systems, liquid ammonia/NH 4 SCN, organic acids, aqueous metal salt solutions, aqueous metal salt hydrate alcohol solutions, aqueous metal salt hydrate aqueous alcohol mixed solutions and other solvent systems according to the type of cellulose or cellulose-containing raw material.
According to an embodiment of the invention, the coagulation bath is selected from at least one of water, alcohol-water mixture, aqueous HCl, aqueous NaOH, aqueous inorganic salt solution, preferably water and/or alcohol, for example water.
For example, the biomass material can be obtained by a production method described in patent document application No. 202310481795.1.
[ Cationized Biomass Material having dendritic or network-like Structure ]
According to the embodiment of the invention, the cationized biomass material structure with a dendritic or network-shaped structure, which is modified by the organic ammonium substance containing halogenated hydrocarbon groups or epoxy groups, has a rich micro-nano multi-stage structure, can be grafted to form a dense network at a certain temperature and time, and a large number of hydroxyl groups are distributed on the micro-nano structure to form a larger network structure.
[ Preparation of cationized Biomass Material having dendritic or network-like Structure ]
Adding an alkaline aqueous solution into the biomass material solution with the dendritic or network-shaped structure, stirring and dissolving to obtain a biomass alkali solution, adding an alcohol organic solvent into the biomass alkali solution for dissolving, adding a cationic etherifying agent for grafting reaction, and washing to obtain the biomass material with the dendritic or network-shaped structure.
According to an embodiment of the present invention, the alkaline aqueous solution is selected from NaOH aqueous solution and/or KOH aqueous solution, and the concentration of the alkaline aqueous solution is 0.1% -3%.
According to the embodiment of the invention, the mass concentration of the biomass with the dendritic or network-like structure in the alkaline solution is 2% -10%.
According to the embodiment of the invention, the temperature of the reaction of the biomass with the dendritic or network-shaped structure in the alkaline solution is 30-60 ℃, and the reaction time is 1-5 h.
According to the embodiment of the invention, the mass ratio of the biomass alkali liquor to the etherifying agent alcohol solution is 1:0.5-1:3.
According to an embodiment of the present invention, the cationic etherifying agent is selected from organic ammonium salts containing halogenated hydrocarbon groups or epoxy groups, for example, one or more of 3-chloro-2-hydroxypropyl-trimethylammonium chloride, epoxypropyltrimethylammonium chloride.
According to the embodiment of the invention, the alcohol organic solvent is one or more of methanol, ethanol and isopropanol.
According to the embodiment of the invention, the temperature of the grafting reaction is 25-75 ℃ and the reaction time is 6-48 h.
According to an embodiment of the present invention, the grafting reaction is carried out under stirring.
The compounds of the general formula of the present invention, as well as the methods for their preparation and use, will be described in further detail below in conjunction with the specific examples. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods.
Example 1
A heat seal coating composition comprising:
15 parts of component A is biomass material with dendritic or network-like structure as shown in figures 1 and 2;
The preparation of the biomass material with the dendritic or network-shaped structure comprises the steps of dissolving 5 parts of cotton pulp in 95 parts of 1-allyl-3-methylimidazole chloride salt, and stirring and dissolving at 70 ℃ for 6 hours to form a biomass solution. Adding the biomass solution and 50 parts of water into a crushing device, mixing the biomass solution and the water, performing mechanical crushing treatment, filtering the water and washing the ionic liquid to prepare the biomass material with the dendritic or network structure, wherein the solid content is 2.5%, and the size is 20-50 mu m.
45 Parts of component B, namely 10 parts of AKD emulsion with the mass fraction of 10%, 5 parts of PLA emulsion with the mass fraction of 20% and 30 parts of PHA emulsion with the mass fraction of 35%;
the emulsifier of the AKD emulsion, the PLA emulsion and the PHA emulsion in the component B is Tween 80, the dosage of the emulsifier is 5% of the mass of the dispersion medium, and the dispersing agent of the AKD emulsion, the PLA emulsion and the PHA emulsion is water.
The component C35 parts is 20 parts of epoxy castor oil, 10 parts of tannic acid and 5 parts of 30% rosin emulsion.
In the component C, the dispersing agent of the rosin emulsion is water, the emulsifying agent is Tween 60, and the use amount of the emulsifying agent is 4% of the mass of rosin.
5 Parts of auxiliary materials, 2 parts of montmorillonite and 3 parts of defoamer. The defoamer is polyether defoamer, and the product number is P-230, which is provided by the Jade chemical industry.
The preparation method of the heat-seal coating composition slurry comprises the following steps:
1) Mixing the component A, the component B, the component C, the auxiliary materials and 60 parts of water, and dispersing at a high speed of 35 ℃ for 40min at a rotating speed of 1500rpm to obtain a mixture;
2) The mixture was treated under ultrasonic conditions for 1h to give a uniform coating mixture slurry with a solids content of 40%.
Taking paper cup heat sealing application as an example, the embodiment provides a specific use method and practical effects.
The method of use is to place and fix the paper cup base paper on a coater, and to use the slurry of the heat-seal coating composition prepared in this example for coating. Selecting a 50 μm wire rod, coating at a coating speed of 10mm/min and a coating temperature of 30 ℃, drying in a forced air drying oven for 20min after coating, wherein the coating weight is 15g/m 2, and obtaining a paper cup finished product.
Water blocking and heat sealing test:
1) Water resistance test
A paper-based bob absorbency tester was used to test the absorbency of the finished paper cup and the base paper of the paper cup within 30 minutes with reference to GBT 1540-2002. (the base paper of the paper cup has a water absorption value Cobb 1800 of 270g/m 2 within 30 min)
2) Heat sealability test
And selecting Labthink an XLW (PC) intelligent electric tension tester, and testing the heat sealing strength of the finished paper cup and the raw paper of the paper cup by referring to QB/T2358.
The test results are shown in table 1:
TABLE 1 the final product of paper cups prepared in example 1 has a very high value and heat seal strength
| Numbering device | Test item | Unit (B) | Test value |
| 1 | Calvating value Cobb 1800 | g/m2 | 11.5 |
| 2 | Heat seal strength | N/15mm | 14 |
The heat sealing strength of the paper cup finished product in the embodiment is larger than 10N/15mm, the Cobb 1800 value is about 10g/m 2, and the paper cup finished product has good water resistance and heat sealing performance.
Example 2
A heat seal coating composition comprising:
15 parts of component A, namely a cationized biomass material with a dendritic or network structure;
The preparation of the cationized biomass material with the dendritic or network structure comprises the steps of adding 2.5 parts of the biomass material with the dendritic or network structure in the embodiment 1 into 195 parts of 0.12% NaOH aqueous solution, stirring for 1h at normal temperature to obtain an alkali dispersion liquid of the biomass, adding 15 parts of absolute ethyl alcohol into the alkali dispersion liquid of the biomass, adding 2.5 parts of 2, 3-epoxypropyl trimethyl ammonium chloride, stirring and reacting for 10h at 50 ℃, and washing with water to be neutral after the reaction is finished to obtain the cationized biomass material with the dendritic or network structure, wherein the solid content is 1.2 and the size is 20-50 mu m.
As shown in fig. 3 and 4, in this example, the biomass material having a dendritic or network structure in example 1 was used as a raw material to prepare a cationized biomass material having a dendritic or network structure, and it is clear from the figure that the surface of the biomass material having a dendritic or network structure was a dense structure before introducing the cationic group, and the surface of the cationized biomass material having a dendritic or network structure was relatively loose and had pores, and the degree of densification was reduced.
The cationized dendritic or network-structured biomass material used in this example had a relatively loose surface structure and a pore structure due to electrostatic repulsion between cationic groups, and the electrostatic interaction could strengthen the binding force with paper products.
Component B35 parts, namely 15 parts of PGA emulsion with the mass fraction of 15 percent and 20 parts of PHA emulsion with the mass fraction of 40 percent;
the emulsifier of the PGA emulsion and the PHA emulsion of the component B is Tween 80, the dosage of the emulsifier is 5% of that of the dispersion medium, and the dispersing agent of the PGA emulsion and the PHA emulsion is water.
The component C40 parts is 15 parts of epoxidized soybean oil, 10 parts of malic acid and 15 parts of thermoplastic starch with mass fraction of 5%.
10 Parts of auxiliary materials, 5 parts of polyaluminum chloride and 5 parts of bentonite.
The preparation method comprises the following steps:
1) Mixing the component A, the component B, the component C, the auxiliary materials and 65 parts of water, and dispersing at a high speed of 40 ℃ for 30min at a rotating speed of 1000rpm to obtain a mixture;
2) The mixture was treated under ultrasonic conditions for 0.5h to give a uniform coating mixture slurry with a solids content of 35%.
The specific application is as follows:
taking paper cup heat sealing application as an example, the embodiment provides specific use methods and practical effects.
The application method comprises the steps of placing and fixing paper cup base paper on a coating machine, coating by using the heat-seal coating composition slurry prepared in the embodiment, selecting a 50-mu m wire rod, coating at a speed of 10mm/min and a coating weight of 15g/m 2, and drying in a blast drying oven for 30min after coating at a coating temperature of 30 ℃ to obtain a paper cup finished product.
Water blocking and heat sealing test:
1) And (3) water resistance test:
paper puffball absorbency tester was used to test the absorbency of paper cup finished products within 30 minutes after coating the heat seal coating composition slurry with reference to GBT 1540-2002.
2) Heat sealability test:
an XLW (PC) intelligent power tensile tester of Labthink was used to test the heat seal strength of paper cup finished products coated with the heat seal coating composition slurry with reference to QB/T2358.
The test results are shown in table 2:
TABLE 2 the final product of paper cups prepared in example 2 has a very high value and heat seal strength
| Numbering device | Test item | Unit (B) | Test value |
| 1 | Calvating value Cobb 1800 | g/m2 | 10.3 |
| 2 | Heat seal strength | N/15mm | 12.5 |
In the embodiment, the heat sealing strength of the paper cup finished product is larger than 10N/15mm, the Cobb 1800 value is about 10g/m 2, and the paper cup finished product has good water resistance and heat sealing property.
Example 3
20 Parts of component A, namely 10 parts of biomass material with a dendritic or network structure and 10 parts of cationized biomass material with a dendritic or network structure;
10 parts of the biomass material having a dendritic or network-like structure prepared in example 1 and 10 parts of the cationized biomass material having a dendritic or network-like structure prepared in example 2 were mixed and dispersed at a high speed of 1000rpm for 10 minutes, to obtain a uniformly mixed biomass material.
45 Parts of component B, namely 5 parts of PLA emulsion with the mass fraction of 5%, 5 parts of PGA emulsion with the mass fraction of 25%, 25 parts of PBAT emulsion with the mass fraction of 35% and 10 parts of PHA emulsion with the mass fraction of 35%;
The components B are PLA emulsion, PGA emulsion, PBAT emulsion and PHA emulsion, wherein the emulsifier is span 80, the dosage of the emulsifier is 3% of the corresponding dispersing medium, and the dispersing agent of the PLA emulsion, PGA emulsion, PBAT emulsion and PHA emulsion is water.
30 Parts of component C, namely 10 parts of ethyl cellulose emulsion with the mass fraction of 2%, 10 parts of thermoplastic starch with the mass fraction of 10%, 2 parts of tannic acid and 8 parts of rosin emulsion with the mass fraction of 25%.
In the rosin emulsion of the component C, the dispersing agent is water, the emulsifying agent is span 80, and the use amount of the emulsifying agent is 5% of that of the dispersing medium.
5 Parts of auxiliary materials, 3 parts of soy protein isolate and 2 parts of defoamer.
The preparation method comprises the following steps:
1) Mixing the component A, the component B, the component C, the auxiliary materials and 10 parts of water, and dispersing at a high speed of 40 ℃ for 50min at a rotating speed of 2000rpm to obtain a mixture;
2) The mixture was treated under ultrasonic conditions for 1.5 hours to give a uniform coating mixture slurry.
Taking paper cup heat sealing application as an example, the embodiment provides specific use methods and practical effects.
The application method comprises placing and fixing paper cup base paper on a coater, and coating with the slurry of the heat-sealing coating composition. Selecting a 50 μm wire rod, coating at a speed of 10mm/min, coating weight of 18g/m 2, coating at a temperature of 30 ℃, and drying in a blast drying oven for 30min after coating to obtain a paper cup finished product.
Water blocking and heat sealing test:
1) Water resistance test
Paper puffball absorbency tester was used to test the absorbency of paper cup finished products within 30 minutes after coating the heat seal coating composition slurry with reference to GBT 1540-2002.
2) Heat sealability test
An XLW (PC) intelligent power tensile tester of Labthink was used to test the heat seal strength of paper cup finished products coated with the heat seal coating composition slurry with reference to QB/T2358.
The test results are shown in table 3:
TABLE 3 values of the final paper cup product prepared in example 3 and Heat seal Strength
| Numbering device | Test item | Unit (B) | Test value |
| 1 | Calvating value Cobb 1800 | g/m2 | 9.2 |
| 2 | Heat seal strength | N/15mm | 18 |
The paper cup finished product in the embodiment has heat sealing strength of more than 10N/15mm, cobb 1800 value of about 10g/m 2 and better water resistance and heat sealing property. The heat seal strength of the composition is further enhanced when the a component is composed of both a biomass material having a dendritic or network-like structure and a cationized biomass material having a dendritic or network-like structure.
Example 4
As a result of the water repellency test performed on the surfaces of the base paper material and the base paper material coated with the coating composition of example 2 (coating method is the same as that of example 2), the water repellency test was performed by dropping 0.15mL of clear water on the surface of the test material.
The surface of the base paper material shows lotus leaf effect after the coating composition in the embodiment 2 is coated, the contact angle of the water drop and the surface of the base material is obtuse angle, and the base paper material has good water blocking effect.
The base paper-based material and the base paper-based material coated with the coating composition of example 2 (coating method same as example 2) were each subjected to a peeling test after heat sealing. As shown in fig. 6, the surface of the base paper-based material was significantly damaged, and the base paper-based material had good heat sealability after the coating composition of example 2 was applied.
Comparative example 1
Test of heat-sealing films prepared by PE (polyethylene) and PP (polypropylene) materials in the prior art through a film coating process (two film coating papers are provided by novel blue collar materials), and test results are shown in Table 4:
TABLE 4 values of the heat seal films made of PP and PE materials and heat seal Strength materials under the same test conditions
From the above, the heat-sealing coating composition disclosed by the invention is completely composed of biodegradable materials, is green, environment-friendly and nontoxic, has better level and coating effect in a wider solid content range (10% -70%), and has excellent water resistance (low Cobb value) and higher heat-sealing strength (more than 10N/15 mm).
Compared with materials such as PE (polyethylene), PP (polypropylene) and the like in the prior art, the heat-sealing layer is prepared by a film spraying process and the like, and the heat-sealing layer can be prepared by a simple coating operation.
The foregoing description of the specific embodiments of the present invention has been presented by way of example. The scope of the invention is not limited to the exemplary embodiments described above. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of protection of the claims of the present invention.
Claims (10)
1. A heat seal coating composition for paper products, said coating composition comprising:
One or two of biomass materials with dendritic or network-like structures or cationized biomass materials with dendritic or network-like structures;
A component B selected from one, two or more of polyhydroxyalkanoates, alkyl ketene dimers, polyglycolides, polylactides, copolymers of butanediol adipate and butanediol terephthalate, cellulose esters and cellulose ethers;
And a component C which is one, two or more of thermoplastic cellulose and derivatives thereof, thermoplastic starch, rosin, cardanol-based epoxy resin, epoxidized soybean oil, epoxidized castor oil, tannic acid and malic acid.
2. The heat seal coating composition for paper products according to claim 1, wherein the heat seal coating composition is composed of the component a, the component B and the component C.
Preferably, the coating composition comprises, by weight, 5-20 parts of a component A, 25-50 parts of a component B and 15-40 parts of a component C, wherein the component B and the component C are emulsion.
3. The heat seal coating composition for paper products according to claim 1, wherein the component a is a mixture of 5-15 parts by weight of biomass having a dendritic or network structure and 5-15 parts by weight of cationized biomass material having a dendritic or network structure, preferably 10-15 parts by weight of biomass having a dendritic or network structure and 8-15 parts by weight of cationized biomass material having a dendritic or network structure.
Preferably, the component B comprises one or more of 20-50 parts by mass of PHA emulsion with the mass fraction of 35%, 2-15 parts by mass of AKD emulsion with the mass fraction of 10%, 5-30 parts by mass of PLA emulsion with the mass fraction of 20%, 10-30 parts by mass of PGA emulsion with the mass fraction of 25%, 5-25 parts by mass of PBAT emulsion with the mass fraction of 35%, 3-15 parts by mass of cellulose ester emulsion with the mass fraction of 20% or cellulose ether emulsion, wherein an emulsifier of the emulsion is Tween 80 or span 80, the using amount of the emulsifier is 3% -5% of the mass of a dispersion medium, and the dispersing agent is water.
Preferably, the component C comprises 20-40 parts by mass of thermoplastic cellulose emulsion (ethyl cellulose, cellulose acetate, carboxymethyl cellulose and the like) with the mass fraction of 2-40 parts by mass, 2-10 parts by mass of thermoplastic starch emulsion with the mass fraction of 5%, 2-15 parts by mass of rosin emulsion with the mass fraction of 25%, 15-35 parts by mass of epoxy vegetable oil and 5-15 parts by mass of polybasic acid or at least comprises one of thermoplastic cellulose, thermoplastic starch or epoxy vegetable oil and a combination of two or more of polybasic acids, wherein an emulsifier of the emulsion is Tween 80 or span 80, the amount of the emulsifier is 3% -5% of the mass of a dispersion medium, and a dispersing agent of the emulsion is water.
4. The heat-seal coating composition for paper products according to claim 1 or 2, wherein the coating composition further comprises 3-15 parts by mass of auxiliary materials.
Preferably, the auxiliary materials are selected from one, two or more of montmorillonite, bentonite, polyaluminum chloride, polyethyleneimine, alum, soy protein isolate, defoamer and bactericide.
5. A method of preparing a coating composition slurry according to any one of claims 1-4, comprising the steps of:
the coating composition according to any one of claims 1-4 is mixed with a solvent and treated under ultrasonic or vacuum conditions for 0.5-2 hours to obtain a coating composition slurry.
6. The method according to claim 5, wherein the mass ratio of the coating composition to the solvent is 1 (1-3).
Preferably, the solvent is deionized water.
Preferably, the temperature of the mixing is 30-50 ℃.
7. The preparation method according to claim 5, characterized in that the preparation method comprises the steps of:
1) Mixing the component A, the component B, the component C, the auxiliary materials and water, and dispersing at a high speed for 30-120 min at a temperature of 30-50 ℃ and a rotating speed of 800-3000 rpm to obtain a mixture;
2) And (3) treating the mixture for 0.5-2 hours under ultrasonic or vacuum conditions to obtain the coating mixture slurry.
Preferably, the solid content in the coating mixture slurry is 10-80%.
8. A method of applying the heat seal coating composition of any one of claims 1-4 or the heat seal coating composition prepared by the method of any one of claims 5-7 to the surface of a paper product, comprising the steps of:
A slurry of the heat seal coating composition described above is applied to at least one surface of a paper product material capable of forming a substrate to form a heat seal coating.
Preferably, after the surface of the substrate-forming material is coated with the aqueous coating, a step of drying, including at least one of baking or hot pressing, is further included.
9. The method of applying a heat seal coating composition to a surface of a paper product according to claim 8, wherein the coating is selected from the group consisting of mechanical coating and spray coating;
Preferably, the machine coating comprises the steps of placing a paper product material forming a base material on a coating machine, selecting a wire rod with the thickness of 20-80 mu m, coating at the coating speed of 5-20 mm/min and the coating temperature of 30-50 ℃, coating the surface of the paper product material with coating mixture slurry with the solid content of 30-75%, and naturally drying for 20-40 min or drying for 10-20 min by a blast drying box after coating.
Preferably, the spraying comprises the following steps of adding the composition with the solid content of 15-45% into a spray gun, uniformly spraying for 2-3 times by using the spray gun, wherein the spraying pressure is 0.25-0.65 mpa, and naturally drying for 15-35 min or drying for 8-20 min by a blast drying box after spraying.
10. A paper product having a heat seal coating includes a substrate and a heat seal coating on at least one surface of the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411486473.7A CN119265999A (en) | 2024-10-23 | 2024-10-23 | A heat-sealing coating composition for paper products and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411486473.7A CN119265999A (en) | 2024-10-23 | 2024-10-23 | A heat-sealing coating composition for paper products and its application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119265999A true CN119265999A (en) | 2025-01-07 |
Family
ID=94113554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411486473.7A Pending CN119265999A (en) | 2024-10-23 | 2024-10-23 | A heat-sealing coating composition for paper products and its application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119265999A (en) |
-
2024
- 2024-10-23 CN CN202411486473.7A patent/CN119265999A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11820920B2 (en) | Microfibrillated cellulose as a crosslinking agent | |
| JP2023138997A (en) | Methods for biobased derivatization of cellulosic surfaces | |
| dos Santos et al. | The use of cellulose nanofillers in obtaining polymer nanocomposites: properties, processing, and applications | |
| US6309509B1 (en) | Composition and paper comprising cellulose ester, alkylpolyglycosides, and cellulose | |
| US11987935B2 (en) | Polyol fatty acid ester carrier compositions | |
| CN113454285A (en) | Production of corrugated board and cardboard containing chemically treated paper | |
| EP4004284B1 (en) | Hemicellulose-containing coatings | |
| EP4004283B1 (en) | Saccharide fatty acid ester latex barrier coating compositions | |
| Krysztof et al. | Regenerated cellulose from N-methylmorpholine N-oxide solutions as a coating agent for paper materials | |
| JP2022507943A (en) | New water-based adhesive using sugar fatty acid ester | |
| EP3935064B1 (en) | Liquid dispersions for acyl halides | |
| Fadel et al. | Use of sugar beet cellulose nanofibers for paper coating | |
| US11530517B2 (en) | Saccharide fatty acid ester inorganic particle combinations | |
| CN114402106B (en) | Composition, film or coating comprising microfibrillated cellulose and extract from bark or cork | |
| CN119265999A (en) | A heat-sealing coating composition for paper products and its application | |
| JP2022538880A (en) | Combination of Sugar Fatty Acid Ester Inorganic Particles | |
| CN119266000A (en) | Oil-proof coating composition for paper products and application thereof | |
| Karlovits | Lignocellulosic Bio-Refinery Downstream Products in Future Packaging Applications | |
| US20240301630A1 (en) | Polyol Fatty Acid Ester Carrier Compositions | |
| US20240352234A1 (en) | Polysaccharide nanofiber-blended polysaccharide composition production method | |
| CN119266004A (en) | A bio-based composition and its application as a paper and plastic pulp additive | |
| CN119265987A (en) | A pulp composition for high-quality paper products and its application | |
| CN119265988A (en) | A modified pulp and paper plastic product thereof | |
| EP4463519A1 (en) | Coating compositions comprising rubber and insoluble alpha-glucan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |