CN114250645A - High-strength easily-inked packaging paper and preparation method thereof - Google Patents
High-strength easily-inked packaging paper and preparation method thereof Download PDFInfo
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- CN114250645A CN114250645A CN202111682925.5A CN202111682925A CN114250645A CN 114250645 A CN114250645 A CN 114250645A CN 202111682925 A CN202111682925 A CN 202111682925A CN 114250645 A CN114250645 A CN 114250645A
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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
- D21H19/385—Oxides, hydroxides or carbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
- C08F218/02—Esters of monocarboxylic acids
- C08F218/04—Vinyl esters
- C08F218/08—Vinyl acetate
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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
-
- 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
- D21H19/46—Non-macromolecular organic compounds
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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
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
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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
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
- Wrappers (AREA)
Abstract
The application relates to the technical field of packaging paper, in particular to high-strength packaging paper easy to ink and a preparation method thereof, the packaging paper sequentially comprises a paper layer and a protective film layer, the protective film layer is formed by coating mixed emulsion on the surface of the paper layer, and the mixed emulsion is prepared from the following raw materials in parts by weight: 50-70 parts of ethylene-vinyl acetate copolymer emulsion, 10-15 parts of chitosan, 10-15 parts of ethyl acetate, 15-25 parts of water-based high gloss oil, 5-15 parts of ionic plastic-replacing oil, 10-20 parts of reinforcing agent, 20-30 parts of polyethylene glycol, 15-25 parts of deionized water and 1-2 parts of citric acid.
Description
Technical Field
The application relates to the technical field of packaging paper, in particular to high-strength packaging paper easy to ink and a preparation method thereof.
Background
The packaging paper is a common packaging material in our lives and is commonly used for paper boxes, paper bags and the like. As is known, paper is a substance with strong brittleness, which is easily damaged and has poor waterproof performance, therefore, when the paper is used for making the wrapping paper, the surface of the paper needs to be deeply processed, for example, a layer of adhesive film layer is coated on the surface of the paper, so that the paper has better strength, the scratching on the surface of the wrapping paper is reduced, and the waterproof performance of the wrapping paper is improved, but with the continuous increase of people's demand, the strength and the waterproof performance of the wrapping paper are only improved, people need to print various characters and patterns on the surface of the wrapping paper for identifying the wrapping paper and enhancing the aesthetic feeling of the wrapping paper, but due to the special chemical performance of the adhesive film layer, the printing ink is difficult to adhere to the surface of the protective film during printing, and therefore, people can improve the printability of the wrapping paper by using a material which is easily printed as the adhesive film layer, but the strength of the adhesive film layer is weakened by the material which is easily printed, leading to the surface of the wrapping paper being easily scratched, and improvement is required.
Disclosure of Invention
In order to enable the packaging paper to have better strength and printability, the application provides the packaging paper which is high in strength and easy to ink and the preparation method thereof.
In a first aspect, the present application provides a high-strength easy-to-ink wrapping paper, which adopts the following technical scheme:
the high-strength easy-inking packaging paper sequentially comprises a paper layer and a protective film layer, wherein the protective film layer is formed by coating mixed emulsion on the surface of the paper layer, and the mixed emulsion is prepared from the following raw materials in parts by weight:
50-70 parts of ethylene-vinyl acetate copolymer emulsion
10-15 parts of chitosan
10-15 parts of ethyl acetate
15-25 parts of water-based high gloss oil
5-15 parts of ionic plastic-replacing oil
10-20 parts of reinforcing agent
20-30 parts of polyethylene glycol
15-25 parts of deionized water
1-2 parts of citric acid.
By adopting the technical scheme, the prepared packaging paper has good tensile strength, tear strength, bursting strength, printability and waterproof performance, so that the surface is not easy to scratch and is easy to print by inking. The ethylene-vinyl acetate copolymer emulsion has good plasticization, compatibility and molding processability, and is mixed with other substances to prepare the mixed emulsion, so that a protective film layer is easily formed on the surface of the paper layer, and the protective film layer has the advantages of good flexibility, good tensile strength, good tear strength, easy inking and the like, so that the protective film layer has good scratch resistance, and when the outside has impact, the protective film layer can buffer the impact force and reduce the damage of the paper layer.
The ionic plastic-replacing oil has the characteristics of high tension, toughness, wear resistance, water resistance, aging resistance and the like, has good adhesion with printing ink, does not adhere back, has excellent adhesion, can be used for preparing a protective film layer, can further improve the water resistance, the impact resistance and the printability of the protective film layer, is convenient for inking the protective film layer and is convenient for printing. The water-based high gloss oil has good glossiness, so that the protective film layer has good yellowing resistance, and can be used for preparing the protective film layer, so that the surface of the protective film layer can obtain good glossiness, and the light resistance of the ink is enhanced.
Chitosan has better binding force with printing ink, can improve the printing property of the protective film layer, and citric acid is dissolved in deionized water to form an acid solution which can dissolve chitosan, so that chitosan and other raw materials can be uniformly mixed, and the bonding fastness of the protective film layer and the paper layer is further enhanced.
The polyethylene glycol has good adhesion and water resistance, the acrylic copolymer mixed solution prepared by matching with other raw materials is coated on the surface of the paper layer and dried to form a compact protective film layer, so that the moisture of the paper layer can be effectively reduced, meanwhile, the polyvinyl alcohol improves the bonding firmness among the raw materials, the tensile strength, the tear strength, the bursting strength, the water resistance and the printability of the packaging paper are further improved, the packaging paper is not easy to damage, and the practicability is high.
Deionized water and ethyl acetate can reduce the consistency of the ethylene-vinyl acetate copolymer emulsion and increase the fluidity of the ethylene-vinyl acetate copolymer emulsion, so that the ethylene-vinyl acetate copolymer emulsion can be uniformly mixed with other raw materials to prepare a mixed emulsion with better fluidity, the mixed emulsion is easy to coat on a paper layer to form a film, the printability, the tensile strength, the tear strength, the bursting strength and the waterproof performance of the protective film layer are further improved, and the deionized water and the ethyl acetate volatile substances are favorable for drying the protective film layer.
The reinforcing agent can improve the tensile strength, the tear strength and the bursting strength of the protective film layer, and the protective film layer has better tensile strength, tear strength, bursting strength, water resistance and other performances and is not easy to damage when being used together with other raw materials.
Optionally, the ethylene-vinyl acetate copolymer emulsion is prepared from the following components in parts by weight:
45-60 parts of vinyl acetate
30-40 parts of ethylene monomer
0.01 to 0.02 portion of reducing agent
15-25 parts of emulsion
4-8 parts of oxidant solution
5-10 parts of buffer solution
0.01-0.02 part of defoaming agent.
The ethylene-vinyl acetate copolymer emulsion prepared by adopting the components has the solid content of 30-50%, has good fluidity and compatibility, is easy to mix with other raw materials, has good film forming property, has a plurality of fine fibers on the surface of a paper layer, can combine with the fibers, can quickly form a film on the surface of the paper layer, can see the surface with unevenness under a magnifying glass of 400 times on the surface of the formed film, and is easy to hang ink.
Optionally, the ethylene-vinyl acetate copolymer emulsion is prepared by the following method:
adding 15-25 parts by weight of emulsion, 0.01-0.02 part by weight of reducing agent, 40-50 parts by weight of vinyl acetate and 0.02-0.05 part by weight of initiator into a reaction kettle, introducing 30-40 parts by weight of ethylene monomer, heating to 60-65 ℃, increasing the pressure of a reaction system to 3-4 MPa, adding 1-4 parts by weight of oxidant solution, heating to 70-80 ℃, and reacting for 30-70 minutes;
adding 4-7 parts of oxidant solution into the reaction kettle, increasing the pressure in the reaction system to 5-6 MPa, adding 5-10 parts of vinyl acetate, reacting for 2-3 hours, cooling to 40-45 ℃, adding 0.01-0.02 part of defoaming agent, reducing the pressure of the reaction system to 1-2 MPa, and reacting for 0.5-1 hour;
and adding 5-10 parts of buffer solution, and adjusting the pH value to 6.5-7.5 to prepare the ethylene-vinyl acetate copolymer emulsion.
The ethylene-vinyl acetate copolymer emulsion prepared by the technical scheme has good fluidity and compatibility, vinyl acetate and ethylene monomers are polymerized to form ethylene-vinyl acetate copolymer, the emulsified solution provides a good emulsifying environment for the reaction of the vinyl acetate and the ethylene monomers, the possibility of solid-liquid separation in the reaction process is reduced, the ethylene-vinyl acetate copolymer can improve the flexibility, the thermal stability and the processability of the protective film layer, the strength performance printability of the packaging paper can be further improved, and the packaging paper is not easy to damage.
Optionally, the weight ratio of the vinyl acetate to the ethylene monomer is (50-55): 40.
by adopting the technical scheme, the ratio of the vinyl acetate to the ethylene monomer is further optimized, so that the ethylene-vinyl acetate copolymer emulsion has better fluidity and compatibility, the solid content is 30-40%, the film is easier to form, the formed protective film layer has better flexibility, thermal stability and processability, and the strength performance and the printability of the packaging paper can be further better.
Optionally, each part of the emulsion is prepared from the following materials in parts by weight:
adding 2-3 parts by weight of ethanol and 3-5 parts by weight of tween into a reaction container, stirring for 20-25 minutes at 40-50 ℃, adding 10-15 parts by weight of deionized water, heating to 85 ℃ to completely dissolve the deionized water, cooling to room temperature, adding 0.26-0.28 part by weight of emulsifier, and stirring for 15-30 min to obtain the emulsion.
The emulsion prepared by the scheme has better emulsification effect, and the phenomenon of solid-liquid separation of ethylene-vinyl acetate copolymer formed by polymerization of vinyl acetate and ethylene monomers is reduced. Tween is a surfactant which can enhance the emulsification of the emulsifier, Tween and the emulsifier can be dissolved to form emulsion under the combined action of ethanol and water, and the ethanol can improve the solubility of Tween, thereby improving the emulsification capacity of the emulsion.
Optionally, the amount of the water-based high gloss oil is 5-10% of the total weight.
The dosage of the aqueous high gloss oil is less than 5 percent of the total weight part, and the glossiness and the flexibility of the protective film layer are influenced by excessive dilution; when the amount of the aqueous high gloss oil exceeds 10% by weight, the strength of the formed protective film is reduced, and the surface of the packaging paper is easily damaged.
Preferably, the spraying dry weight of the protective film layer is 5-15 g/m2。
By adopting the technical scheme, the protective film layer has better waterproof performance and material performance, the raw materials are mixed for use, coated on the surface of the paper layer and dried to prepare the protective film layer, and the dry coating weight after drying is 5-15 g/m2The thickness of the protective film layer is 0.1-0.1 mm, so that the protective film layer is thin and good in strength, ethanol, ethyl acetate and most of water are volatilized in the drying process, the protective film layer also contains a small part of water, the surface of the protective film layer has certain wettability, and the surface wettability can reach more than 38%, so that the surface of the protective film layer can be printed, and meanwhile, the wear resistance, the tensile strength, the tear resistance, the bursting strength and the waterproof performance of the protective film layer are improved.
In a second aspect, the application adopts a preparation method of the high-strength easy-inking packaging paper, and adopts the following technical scheme: a preparation method of a high-strength easy-to-ink packaging paper comprises the following steps:
1) preparing a mixed emulsion: weighing 15-25 parts by weight of deionized water and 1-2 parts by weight of citric acid, mixing and dissolving, adding 10-15 parts by weight of chitosan, stirring until the chitosan is dissolved, sequentially adding 10-15 parts by weight of ethyl acetate, 20-30 parts by weight of polyethylene glycol and ethylene-vinyl acetate copolymer emulsion, stirring uniformly, and adding 10-20 parts by weight of reinforcing agent to prepare mixed emulsion;
2) spraying the mixed emulsion prepared in the step 1) on the surface of a paper layer, and drying at the drying temperature of 95-105 ℃ after the coating is finished to obtain the high-strength easily-inked packaging paper.
The spraying operation has less procedures, short construction time and high efficiency, the equipment is not contacted with the paper layer during spraying, the surface structure of the paper layer can be well protected, and meanwhile, because the surface of the paper layer is not uniform and has irregular shape, the mixed emulsion can form a smooth and flat coating on the surface of the paper layer by adopting a spraying mode.
Optionally, the spraying pressure in the step 2) is 1-2 MPa, and two times of spraying are performed.
When the spraying pressure is less than 1Mpa, the mixed emulsion cannot be uniformly sprayed to the surface of the paper layer, so that the thickness of the formed protective film layer is uneven, and the paper layer is easy to generate indentation by external impact; when the spraying pressure is more than 2Mpa, the spraying pressure is too high, and the paper layer is easily damaged during spraying.
Optionally, the spraying in step 2) is performed twice, and after the first spraying is dried, the second spraying is performed.
Through adopting above-mentioned technical scheme for the thickness of protection rete increases, makes the protection rete that forms have better shock resistance and prevents scraping colored performance.
In summary, the present application has the following beneficial effects:
1. according to the method, the ethylene-vinyl acetate copolymer emulsion, the chitosan, the ethyl acetate, the water-based high gloss oil, the ion plastic replacing oil, the reinforcing agent, the polyethylene glycol, the deionized water and the citric acid are compounded for use to prepare the mixed emulsion, the spraying is easy, and the mixed emulsion is sprayed on the surface of the paper layer to form the protective film layer, so that the packaging paper has good tensile strength, tear strength, bursting strength and waterproof performance, the surface is not easy to scratch, and meanwhile, the ink printing is easy to perform.
2. According to the preparation method, the vinyl acetate, the ethylene monomer, the reducing agent, the emulsion, the oxidant solution, the buffer solution and the defoaming agent are compounded for use, the prepared ethylene-vinyl acetate copolymer emulsion has the solid content of 30-50%, has good fluidity and compatibility, is easy to mix with other raw materials, has good film forming property, can improve the flexibility, the thermal stability and the processability of a protective film layer through the ethylene-vinyl acetate copolymer, can further improve the strength performance printability of packaging paper, and is not easy to damage.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples. The starting polymers used in this application are commercially available, with some sources and types of starting materials, as shown in table 1:
TABLE 1 sources and types of some of the source materials
Preparation example of emulsion
Preparation example 1
An emulsion prepared by the following method:
adding 0.2 kg of ethanol and 0.3 kg of tween into a reaction vessel, stirring for 20-25 minutes at 40 ℃, adding 1 kg of deionized water, heating to 85 ℃ to completely dissolve the ethanol, cooling to room temperature, adding polyoxypropylene ether, and stirring for 15 minutes to obtain an emulsified solution.
The preparation examples 2 to 3 are different from the preparation example 1 in that: the dosage of ethanol, tween, deionized water and the emulsifier is different, and the emulsifier is polyoxypropylene ether, as shown in table 2:
| preparation example 1 | Preparation example 2 | Preparation example 1 | |
| Ethanol (Kg) | 0.2 | 0.25 | 0.3 |
| Tween (Kg) | 0.3 | 0.4 | 0.5 |
| Deionized water (Kg) | 1 | 1.25 | 1.5 |
| Polyoxypropylene Ether (Kg) | 0.002 | 0.0025 | 0.003 |
Preparation example
Preparation example 4
An ethylene-vinyl acetate copolymer emulsion is prepared by the following method:
adding 1.5 kg of emulsion from preparation example 1, 0.001 kg of tartaric acid, 4 kg of vinyl acetate and 0.002 kg of hydrogen peroxide into a reaction kettle, introducing 3 kg of ethylene monomer, heating to 60 ℃, increasing the pressure of a reaction system to 3MPa, adding 0.3 kg of oxidant solution, heating to 70 ℃, and reacting for 30 min;
adding 0.1 kg of oxidant solution into the reaction kettle, increasing the pressure in the reaction system to 5MPa, adding 0.5 kg of vinyl acetate, reacting for 2h, cooling to 40 ℃, adding 0.002 kg of lauric acid, reducing the pressure of the reaction system to 1MPa, and reacting for 0.5 h;
then 0.5 kg of sodium bicarbonate solution with the mass fraction of 5 percent is added, and the pH value is adjusted to 7, thus obtaining the ethylene-vinyl acetate copolymer emulsion.
The reducing agent is tartaric acid, the initiator is hydrogen peroxide, the buffer solution is a sodium bicarbonate solution with the mass fraction of 5%, the defoaming agent is lauric acid, and the oxidizing agent solution is a sodium peroxide solution with the mass fraction of 0.2%.
The preparation examples 5 to 6 are different from the preparation example 4 in that: the above components were used in different amounts, as shown in table 3:
TABLE 3 kinds and amounts of components used in preparation examples 4 to 6
Examples
Example 1
A high-strength easily-inked wrapping paper is prepared by the following method:
1) preparing a mixed emulsion: weighing 1.5 kg of deionized water and 0.1 kg of citric acid, mixing and dissolving, adding 1 kg of chitosan, stirring until the chitosan is dissolved, sequentially adding 1 kg of ethyl acetate, 2 kg of polyethylene glycol and 5 kg of a commercially available ethylene-vinyl acetate copolymer emulsion, uniformly stirring, adding 1 kg of titanium dioxide, 0.5 kg of water-based high gloss oil and 0.5 kg of ionic plastic replacement oil, and preparing a mixed emulsion;
2) spraying the mixed emulsion prepared in the step 1) on the surface of a paper layer, and drying at the drying temperature of 95 ℃ after the coating is finished to obtain the high-strength easily-inked packaging paper.
The paper is kraft paper, purchased from showpa, inc, of dongguan, at a grade of one.
Examples 2 to 5 differ from example 1 in the amount of part of the raw materials used, as shown in table 4:
TABLE 4 amount and kind of raw materials used in examples 1 to 5
Comparative example
Comparative example 1
This comparative example differs from example 5 in that: the same amount of ethylene-vinyl acetate copolymer emulsion was replaced with the acrylic acid copolymer emulsion, and the remaining steps and amounts were the same as in example 5.
Comparative example 2
This comparative example differs from example 5 in that: carboxymethylcellulose was used in place of an equivalent amount of chitosan and the remaining steps and amounts were consistent with example 5.
Comparative example 3
This comparative example differs from example 5 in that: in step 2), the spray coating was replaced by roll coating, and the remaining steps and amounts were the same as in example 5.
Performance test
The paper wrapper was tested for tear, tensile strength, smoothness and print surface strength.
Detection method/test method
And (3) tearing strength test: the detection is carried out according to the GB/T455.1-89 standard.
And (3) testing the tensile strength: detection is carried out according to the GB/T453-89 standard.
Smoothness testing: and (4) detecting according to the GB/T456-89 standard.
Printing surface strength: the detection is carried out according to the GB/T3331-82 standard. The results are shown in table 5:
table 5 performance testing experimental data
As can be seen by combining examples 1 to 5 and comparative examples 1 to 3 and combining Table 5, the numerical values of the bursting strength, tearing strength, smoothness and printing surface strength in examples 1 to 5 are higher than those in comparative examples 1 to 3, and the bursting strength, tearing strength, smoothness and printing surface strength of the wrapping paper prepared by the method are better than those in comparative examples 1 to 3, so that the wrapping paper is easy to print.
Example 5 and comparative examples 1 to 3 in combination with table 5, it can be seen that the ethylene-vinyl acetate copolymer emulsion, chitosan and the spraying manner affect the values of bursting strength, tearing strength, smoothness and printing surface strength, and it is demonstrated that the ethylene-vinyl acetate copolymer emulsion can be used in combination with other raw materials to improve the bursting strength, tearing strength, smoothness and printing surface strength of the packaging paper; the chitosan is mixed with other raw materials for use, so that the bursting strength, tearing strength, smoothness and printing surface strength of the packaging paper can be improved; the spraying mode can improve the bursting strength, tearing strength, smoothness and printing surface strength of the packaging paper.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The utility model provides a wrapping paper of easy inking of high strength includes paper layer and protection film layer in proper order, its characterized in that: the protective film layer is formed by coating mixed emulsion on the surface of a paper layer, and the mixed emulsion is prepared from the following raw materials in parts by weight:
50-70 parts of ethylene-vinyl acetate copolymer emulsion
10-15 parts of chitosan
10-15 parts of ethyl acetate
15-25 parts of water-based high gloss oil
5-15 parts of ionic plastic-replacing oil
10-20 parts of reinforcing agent
20-30 parts of polyethylene glycol
15-25 parts of deionized water
1-2 parts of citric acid.
2. A high strength, easy to apply package according to claim 1, wherein: the ethylene-vinyl acetate copolymer emulsion is prepared from the following components in parts by weight:
45-60 parts of vinyl acetate
30-40 parts of ethylene monomer
0.01 to 0.02 portion of reducing agent
15-25 parts of emulsion
4-8 parts of oxidant solution
5-10 parts of buffer solution
0.01-0.02 part of defoaming agent.
3. A high strength, easily inked wrapping paper as claimed in claim 2, wherein: the ethylene-vinyl acetate copolymer emulsion is prepared by the following method:
adding 15-25 parts by weight of emulsion, 0.01-0.02 part by weight of reducing agent, 40-50 parts by weight of vinyl acetate and 0.02-0.05 part by weight of initiator into a reaction kettle, introducing 30-40 parts by weight of ethylene monomer, heating to 60-65 ℃, increasing the pressure of a reaction system to 3-4 MPa, adding 1-4 parts by weight of oxidant solution, heating to 70-80 ℃, and reacting for 30-70 minutes;
adding 4-7 parts of oxidant solution into the reaction kettle, increasing the pressure in the reaction system to 5-6 MPa, adding 5-10 parts of vinyl acetate, reacting for 2-3 hours, cooling to 40-45 ℃, adding 0.01-0.02 part of defoaming agent, reducing the pressure of the reaction system to 1-2 MPa, and reacting for 0.5-1 hour;
and adding 5-10 parts of buffer solution, and adjusting the pH value to 6.5-7.5 to prepare the ethylene-vinyl acetate copolymer emulsion.
4. A high strength, easily inked wrapping paper according to claim 3, wherein: the weight ratio of the vinyl acetate to the ethylene monomer is (50-55): 40.
5. a high strength, easily inked wrapping paper according to claim 2 or 3, wherein: each part of the emulsion is prepared from the following materials in parts by weight:
adding 2-3 parts by weight of ethanol and 3-5 parts by weight of tween into a reaction container, stirring for 20-25 minutes at 40-50 ℃, adding 10-15 parts by weight of deionized water, heating to 85 ℃ to completely dissolve the deionized water, cooling to room temperature, adding 0.26-0.28 part by weight of emulsifier, and stirring for 15-30 min to obtain an emulsified solution.
6. A high strength, easy to apply package according to claim 1, wherein: 5-10% of the total amount of the water-based high gloss oil.
7. A high strength, easy to apply package according to claim 1, wherein: the dry spraying amount of the protective film layer is 5-15 g/m2。
8. A high strength, easy-to-ink manufacturing process according to any of claims 1 to 7, characterized in that it comprises the following steps:
1) preparing a mixed emulsion: weighing 15-25 parts by weight of deionized water and 1-2 parts by weight of citric acid, mixing and dissolving, adding 10-15 parts by weight of chitosan, stirring until the chitosan is dissolved, sequentially adding 10-15 parts by weight of ethyl acetate, 20-30 parts by weight of polyethylene glycol and ethylene-vinyl acetate copolymer emulsion, uniformly stirring, adding 10-20 parts by weight of reinforcing agent, 15-25 parts by weight of water-based high gloss oil and 5-15 parts by weight of ionic plastic-replacing oil, and preparing mixed emulsion;
2) spraying the mixed emulsion prepared in the step 1) on the surface of a paper layer, and drying at the drying temperature of 95-105 ℃ after the coating is finished to obtain the high-strength easily-inked packaging paper.
9. A high strength, easy to apply package according to claim 9, wherein: the spraying pressure in the step 2) is 1-2 MPa.
10. A high strength, easy to apply package according to claim 9, wherein: and 2), carrying out two times of spraying in the step 2), and carrying out the second spraying after the first spraying is dried.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116180487A (en) * | 2022-12-30 | 2023-05-30 | 广东冠力新材料有限公司 | Waterproof paper bag adhesive with high bursting strength and preparation method thereof |
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| CN114250645B (en) | 2022-11-22 |
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