CN111172805A - Preparation method of biomass-based barrier coating - Google Patents
Preparation method of biomass-based barrier coating Download PDFInfo
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- CN111172805A CN111172805A CN202010025722.8A CN202010025722A CN111172805A CN 111172805 A CN111172805 A CN 111172805A CN 202010025722 A CN202010025722 A CN 202010025722A CN 111172805 A CN111172805 A CN 111172805A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
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Abstract
The invention provides a preparation method of a biomass-based barrier coating, and particularly relates to a preparation method of a biomass-based barrier coating which takes biomass-based microfibrillated cellulose as a main raw material and is suitable for coating the surface of a base material. Firstly, preparing 1-5% of suspension from microfibrillated cellulose under a high shear condition, and then sequentially adding a biomass adhesive, a rheology modifier and a pigment dispersion liquid under a condition of reducing a shear rate to prepare a barrier coating dispersion liquid; the second step is to coat the prepared barrier coating on the surface of the substrate by means of bar, blade, spray and curtain coating, preferably curtain coating. The obtained barrier coating has excellent barrier property and good biodegradability.
Description
Technical Field
The invention belongs to paper coating in the paper industry, and particularly relates to a preparation method of a biomass-based barrier coating.
Background
In the packaging industry, the development of green packaging based on the principles of reduction, repeated use, recycling, degradability and the like to replace the traditional packaging is a necessary trend in the development of the packaging industry. The biomass-based packaging material is prepared from raw materials derived from biomass resources such as animals and plants, is harmless to human bodies and does not cause environmental pollution from raw material collection, material processing, product manufacturing, product use, waste recycling, incineration treatment and the like, and plays an important role in promoting the development of green packaging.
The paper packaging material is one of biomass-based packaging materials, has the characteristics of light weight, low price, easy recycling after being discarded, easy natural degradation and the like, and accords with the 3R1D principle required by green packaging. Paper packaging materials are widely used in industrial packaging and food packaging because of their excellent protective properties such as heat insulation, light shielding, moisture and dust protection, and good handling and storage properties. Although the paper packaging material has many unique advantages, the paper packaging material belongs to a porous network structure material from the view point of forming results, and the paper packaging material also needs to be coated on the surface or compounded with other materials such as plastics, aluminum foil and the like in order to obtain good barrier properties such as oxygen and water vapor barrier properties.
The invention application patent CN201811087439.7 'a high-barrier coating white cardboard and a preparation method thereof' discloses a high-barrier coating white cardboard, which belongs to the method that a barrier coating is coated on the surface of the white cardboard, wherein the barrier coating is composed of styrene, butadiene, polybutyl acrylate, polyolefin, isooctyl acrylate and porcelain clay. The invention application patent CN201910607589.4 discloses an aqueous high-barrier coating liquid and a manufacturing method thereof, the aqueous high-barrier coating liquid disclosed by the patent comprises a hydroxyl water-soluble polymer, a nano oxide, graphene, an organosiloxane coupling agent, hydrochloric acid and a solvent, and the purposes of blocking oxygen and water vapor are achieved by exerting the mutual barrier effect of the graphene and the nano oxide and the cross-linking effect of the graphene and the water-soluble polymer. The invention discloses CN 201711458400.7' a high-barrier coated paper prepared from lignin-modified biological adhesive, which is characterized in that calcium lignosulfonate is modified by polyvinyl alcohol and poly (3, 4-ethylenedioxythiophene) -poly (styrenesulfonic acid) to obtain a coating liquid, and the coating liquid is coated to obtain the coated paper with excellent barrier property.
From the prior art, the surface coating method provides good barrier property for the packaging paper, the used coating mainly or mostly comes from petroleum-based products, and the existence of the coating undoubtedly reduces the difficulty of biodegradation and recycling of the paper packaging materials.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a preparation method of a biomass-based barrier coating which takes biomass-based microfibrillated cellulose as a main raw material and is suitable for coating the surface of a substrate. The adopted technical scheme is as follows:
a preparation method of a biomass-based barrier coating comprises the following steps of coating a microfibrillated cellulose, a biomass adhesive, a rheology modifier and a pigment, and specifically comprises the following components: 20-90 parts of microfibrillated cellulose, 0-50 parts of biomass adhesive, 1-15 parts of rheological modifier and 5-50 parts of pigment.
Further preferably, the barrier coating consists of: 50-90 parts of microfibrillated cellulose, 5-10 parts of a rheological modifier and 10-45 parts of a pigment.
The preparation method of the barrier coating comprises the following steps: (1) preparation of the barrier coating, wherein 1-5% of suspension is prepared from microfibrillated cellulose under a high shear condition, and then a biomass adhesive, a rheology modifier and a pigment dispersion are sequentially added under a condition of reducing the shear rate, wherein the solid content of the pigment dispersion is 40-70%, and the solid content of the final coating is 2-10%. (2) And (3) coating a barrier coating, wherein the prepared barrier coating is coated on the surface of the substrate by a bar coating mode, a scraper blade mode, a spraying mode and a curtain coating mode to form a coating layer with high barrier property, and the preferred coating mode is curtain coating.
The microfibrillated cellulose is obtained by taking pulp fiber as a raw material and performing mechanical treatment. In particular, the microfibrillated cellulose is obtained by taking corncob waste residues as raw materials through a mechanical treatment mode. The microfibrillated cellulose has a median particle size of 0.5-100 μm. Preferred microfibrillated cellulose is obtained by chemical pretreatment including carboxyethyl treatment and carboxymethyl treatment, followed by mechanical treatment.
The biomass adhesive comprises starch and soybean protein.
The pigment comprises porcelain clay, calcium carbonate, talcum powder and titanium dioxide.
The rheology modifier comprises sodium carboxymethyl cellulose and guar gum.
Has the advantages that: the barrier coating prepared by the method replaces the commonly used petroleum-based non-degradable components in the barrier coating with the biomass degradable components, effectively improves the degradability of the coating, and overcomes the difficulties of biodegradation and recycling of paper packaging materials. The microfibrillated cellulose is used as a main barrier component, so that the barrier coating has good biodegradability, and the barrier coating has excellent oxygen and oil resistance by optimizing the combination ratio of the microfibrillated cellulose to the pigment.
Drawings
Figure 1 is a graph of the rheological properties of the barrier coatings obtained in the examples.
FIG. 2 shows the results of the water contact angle test in examples.
Fig. 3 shows the results of the oil contact angle test in the examples.
Detailed Description
The present invention is further described below with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The microfibrillated cellulose is obtained by taking bamboo pulp fiber as a raw material, performing carboxyethylation pretreatment and then mechanically grinding, wherein the median particle size of the obtained microfibrillated cellulose is 68.9 microns, and the carboxyl content of the microfibrillated cellulose is 0.91 mmol/g. The rheology modifier is sodium carboxymethylcellulose, and is prepared into 5% dispersion under the stirring condition. The pigment is porcelain clay, and is prepared into 55% dispersion liquid under the condition of high-speed dispersion.
A method for preparing a biomass-based barrier coating comprises the following steps: (1) preparing 90 parts of microfibrillated cellulose into 2.5% suspension under the condition of high-speed shearing, then sequentially adding 5 parts of sodium carboxymethylcellulose and 5 parts of pigment dispersion liquid under the condition of reducing the shearing rate, and continuously shearing and mixing for 10min under the condition to obtain the barrier coating with the solid content of 2.67%. The high shear rheology of the barrier coating is shown in figure 1. (2) Coating a barrier coating on the surface of a coated white cardboard serving as a coating substrate, and coating by curtain coating, wherein the coating weight of the obtained coating is 15g/m2The barrier properties of the resulting coating as well as the coated substrate coated white cardboard are shown in table 1.
Example 2
The microfibrillated cellulose is obtained by taking corncob waste residue fibers as a raw material, performing carboxymethylation pretreatment and then mechanically grinding, wherein the median particle size of the obtained microfibrillated cellulose is 71.8 microns, and the carboxyl content of the microfibrillated cellulose is 0.84 mmol/g. The rheology modifier is sodium carboxymethylcellulose, and is prepared into 5% dispersion under the stirring condition. The pigment is porcelain clay, and is prepared into 55% dispersion liquid under the condition of high-speed dispersion.
A method for preparing a biomass-based barrier coating comprises the following steps: (1) 80 parts of microfibrillated cellulose is prepared into 3.0% suspension under the condition of high-speed shearing, 10 parts of sodium carboxymethylcellulose and 10 parts of pigment dispersion liquid are sequentially added under the condition of reducing the shearing rate, and the barrier coating with the solid content of 3.47% is prepared after continuous shearing and mixing for 10min under the condition. The high shear rheology of the barrier coating is shown in figure 1. (2) Coating a barrier coating on the surface of a coated white cardboard serving as a coating substrate, and coating by curtain coating, wherein the coating weight of the obtained coating is 20g/m2The barrier properties of the resulting coating as well as the coated substrate coated white cardboard are shown in table 1.
Example 3
The microfibrillated cellulose is obtained by taking corncob waste residue fibers as a raw material, performing carboxymethylation pretreatment and then mechanically grinding, wherein the median particle size of the obtained microfibrillated cellulose is 25.7 microns, and the carboxyl content of the microfibrillated cellulose is 0.84 mmol/g. The biomass adhesive is coating-grade modified starch, and is gelatinized at a high temperature of 90 ℃ to prepare a 30% suspension. The rheology modifier is sodium carboxymethylcellulose, and is prepared into 5% dispersion under the stirring condition. The pigment is porcelain clay, and is prepared into 55% dispersion liquid under the condition of high-speed dispersion.
A method for preparing a biomass-based barrier coating comprises the following steps: (1) 60 parts of microfibrillated cellulose are prepared into a 3.0% suspension under high shear, 10 parts of coating starch, 10 parts of sodium carboxymethylcellulose and 20 parts of pigment dispersion are added in sequence under reduced shear rate, and shear mixing is continued under these conditionsThe barrier coating with the solid content of 4.40 percent is prepared after 10 min. The high shear rheology of the barrier coating is shown in figure 1. (2) Coating a barrier coating on the surface of a coated white cardboard serving as a coating substrate, and coating by curtain coating, wherein the coating weight of the obtained coating is 15g/m2The barrier properties of the resulting coating as well as the coated substrate coated white cardboard are shown in table 1.
Example 4
The microfibrillated cellulose is obtained by taking corncob waste residue fibers as a raw material, performing carboxymethylation pretreatment and then mechanically grinding, wherein the median particle size of the obtained microfibrillated cellulose is 25.7 microns, and the carboxyl content of the microfibrillated cellulose is 0.84 mmol/g. The biomass adhesive is coating-grade modified starch, and is gelatinized at a high temperature of 90 ℃ to prepare a 30% suspension. The rheology modifier is sodium carboxymethylcellulose, and is prepared into 5% dispersion under the stirring condition. The pigment is porcelain clay, and is prepared into 55% dispersion liquid under the condition of high-speed dispersion.
A method for preparing a biomass-based barrier coating comprises the following steps: (1) 60 parts of microfibrillated cellulose is prepared into 3.0% suspension under the condition of high-speed shearing, then 10 parts of coating starch, 10 parts of sodium carboxymethyl cellulose and 20 parts of pigment dispersion liquid are sequentially added under the condition of reducing the shearing rate, and the barrier coating with the solid content of 4.40% is prepared after continuous shearing and mixing for 10min under the condition. The high shear rheology of the barrier coating is shown in figure 1. (2) Coating a barrier coating on the surface of a coated white cardboard serving as a coating substrate, and performing bar coating for three times to obtain a coating with the coating weight of 14g/m2The barrier properties of the resulting coating as well as the coated substrate coated white cardboard are shown in table 1.
Example 5
The microfibrillated cellulose is obtained by taking bleached softwood pulp fiber as a raw material, performing carboxyethylation pretreatment and then mechanically grinding, wherein the median particle size of the obtained microfibrillated cellulose is 65 micrometers, and the carboxyl content of the microfibrillated cellulose is 1.19 mmol/g. The rheology modifier is sodium carboxymethylcellulose, and is prepared into 5% dispersion under the stirring condition. The pigment is talcum powder and is prepared into 50 percent dispersion liquid under the condition of high-speed dispersion.
A method for preparing a biomass-based barrier coating comprises the following steps: (1) 70 parts of microfibrillated cellulose is prepared into 2.0% suspension under the condition of high-speed shearing, then 10 parts of coating starch, 5 parts of sodium carboxymethyl cellulose and 15 parts of pigment dispersion liquid are sequentially added under the condition of reducing the shearing rate, and the barrier coating with the solid content of 2.73% is prepared after continuous shearing and mixing for 10min under the condition. The high shear rheology of the barrier coating is shown in figure 1. (2) Coating a barrier coating on the surface of a coated white cardboard serving as a coating substrate, and performing bar coating for three times to obtain a coating with the coating weight of 16g/m2The barrier properties of the resulting coating as well as the coated substrate coated white cardboard are shown in table 1.
Example 6
The microfibrillated cellulose is obtained by taking corncob waste residue fibers as a raw material and directly performing mechanical grinding without chemical pretreatment, the median particle size of the obtained microfibrillated cellulose is 16.3 micrometers, and the carboxyl content of the microfibrillated cellulose is 0.14 mmol/g. The biomass adhesive is coating-grade modified starch, and is gelatinized at a high temperature of 90 ℃ to prepare a 30% suspension. The rheology modifier is sodium carboxymethylcellulose, and is prepared into 5% dispersion under the stirring condition. The pigment is porcelain clay, and is prepared into 55% dispersion liquid under the condition of high-speed dispersion.
A method for preparing a biomass-based barrier coating comprises the following steps: (1) 60 parts of microfibrillated cellulose is prepared into 3.0% suspension under the condition of high-speed shearing, then 10 parts of coating starch, 10 parts of sodium carboxymethyl cellulose and 20 parts of pigment dispersion liquid are sequentially added under the condition of reducing the shearing rate, and the barrier coating with the solid content of 4.40% is prepared after continuous shearing and mixing for 10min under the condition. The high shear rheology of the barrier coating is shown in figure 1. (2) Coating a barrier coating on the surface of a coated white cardboard serving as a coating substrate, and performing bar coating for three times to obtain a coating with the coating weight of 15g/m2The barrier properties of the resulting coating as well as the coated substrate coated white cardboard are shown in table 1.
TABLE 1
The invention is implemented according to the specific implementation, and obtains better barrier effect.
Claims (9)
1. A preparation method of a biomass-based barrier coating is characterized by comprising the following steps: (1) preparing a barrier coating, namely preparing 1-5% of suspension from microfibrillated cellulose under a high shear condition, and then sequentially adding a biomass adhesive, a rheology modifier and a pigment dispersion liquid under a condition of reducing a shear rate to form a barrier coating dispersion liquid; (2) and (3) coating the barrier coating, wherein the prepared barrier coating dispersion is coated on the surface of the base material in a surface coating mode to form a coating with high barrier property.
2. The method for preparing the biomass-based barrier coating according to claim 1, wherein the coating of the barrier coating comprises microfibrillated cellulose, a biomass adhesive, a rheology modifier and a pigment, and the composition of the coating is as follows: 20-90 parts of microfibrillated cellulose, 0-50 parts of biomass adhesive, 1-15 parts of rheological modifier and 5-50 parts of pigment.
3. The method for preparing the biomass-based barrier coating according to claim 1, wherein the solid content of the pigment dispersion liquid is 40-70%, and the solid content of the coating dispersion liquid is 2-10%.
4. The method of making a biomass-based barrier coating of claim 1, wherein the surface coating is selected from the group consisting of bar coating, knife coating, spray coating, and curtain coating.
5. The method for preparing the biomass-based barrier coating according to claim 1, wherein the microfibrillated cellulose is obtained by mechanical treatment using corncob waste residues as raw materials, and the median particle size of the microfibrillated cellulose is 0.5-100 μm.
6. The method for preparing the biomass-based barrier coating according to claim 1, wherein the microfibrillated cellulose is obtained by mechanical treatment using pulp fiber as a raw material.
7. The method of preparing a biomass-based barrier coating according to claim 1, wherein the biomass adhesive comprises starch and soy protein.
8. The method of making a biomass-based barrier coating of claim 1, wherein the pigments include china clay, calcium carbonate, talc and titanium dioxide.
9. The method of making a biomass-based barrier coating of claim 1, wherein the rheology modifier comprises sodium carboxymethyl cellulose, guar gum.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112431066A (en) * | 2020-11-24 | 2021-03-02 | 中国制浆造纸研究院有限公司 | Preparation method of talcum powder for environment-friendly paper-based high-barrier packaging material |
| CN115584659A (en) * | 2022-09-30 | 2023-01-10 | 中国制浆造纸研究院有限公司 | High-barrier fresh-keeping material and preparation method thereof |
| CN116240751A (en) * | 2023-02-02 | 2023-06-09 | 仲恺农业工程学院 | High-barrier full-degradable cellulose packaging paper and preparation method and application thereof |
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| CN115584659B (en) * | 2022-09-30 | 2024-04-26 | 中国制浆造纸研究院有限公司 | High-barrier fresh-keeping material and preparation method thereof |
| CN116240751A (en) * | 2023-02-02 | 2023-06-09 | 仲恺农业工程学院 | High-barrier full-degradable cellulose packaging paper and preparation method and application thereof |
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