CN111321631A - Waterproof paper box and preparation process thereof - Google Patents
Waterproof paper box and preparation process thereof Download PDFInfo
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- CN111321631A CN111321631A CN202010135554.8A CN202010135554A CN111321631A CN 111321631 A CN111321631 A CN 111321631A CN 202010135554 A CN202010135554 A CN 202010135554A CN 111321631 A CN111321631 A CN 111321631A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
- B31B50/20—Cutting sheets or blanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/26—Folding sheets, blanks or webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/62—Uniting opposed surfaces or edges; Taping by adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/14—Linings or internal coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/34—Coverings or external coatings
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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
- D21H19/44—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
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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
- D21H19/64—Inorganic 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
- D21H19/72—Coated paper characterised by the paper substrate
- D21H19/74—Coated paper characterised by the paper substrate the substrate having an uneven surface, e.g. crêped or corrugated paper
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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
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
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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
- 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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- 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
- D21H21/16—Sizing or water-repelling agents
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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
- 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
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
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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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the field of paper boxes, in particular to a waterproof paper box and a preparation process thereof. The waterproof paper box is processed from a waterproof paper board, the waterproof paper board comprises a corrugated paper layer and a waterproof layer, the waterproof layer is obtained by curing and film-forming polyurethane resin emulsion, and the polyurethane resin emulsion comprises the following components in parts by mass: 100-150 parts of waterborne polyurethane; 5-7 parts of a leveling agent; 1-2 parts of a curing agent; 30-40 parts of a filler; 2-3 parts of a mildew-proof algaecide; 10-15 parts of pasty lignocellulose; 20-30 parts of paper pulp; 3-4 parts of a dispersing agent; 10-20 parts of a pigment; 1-3 parts of an emulsifier; 70-90 parts of water. The waterproof paper box only consists of the corrugated paper layer and the polyurethane waterproof layer, the preparation process is simpler, the manufacturing cost is moderate, and the market demand can be met; the polyurethane coating film obtained by the formula has strong surface hydrophobicity, is difficult to suspend in the coating process, has strong operability, and is suitable for the automatic coating process.
Description
Technical Field
The invention relates to the field of paper boxes, in particular to a waterproof paper box and a preparation process thereof.
Background
A carton is a packaging material, which is often used in daily life. In order to meet different requirements of different consumers, the paper boxes are diversified, wherein one type of the paper boxes has a waterproof function and certain moisture resistance.
The Chinese patent with patent No. CN209667594U discloses a waterproof paper box, wherein a waterproof base is arranged below a paper box body of the waterproof paper box, a waterproof cover is arranged above the paper box body, the paper box body is embedded into the waterproof base and then sealed by sealant, a sealing strip is also arranged at the bottom end of the waterproof cover, the waterproof base and the waterproof base are mutually connected in a sealing manner, and the waterproof performance of the whole paper box is guaranteed. Such carton has better waterproof performance, packs the goods when being applicable to the transportation goods.
In addition, chinese patent with patent grant publication No. CN207917386U discloses a waterproof paper box, which has the technical scheme key points that: the carton bottom is provided with the lime crystal ball and reaches inside dampproofing effect as the drier, and the box body of carton itself by outer polyurethane waterproof coating, polyvinyl chloride layer, corrugated paper, glass fiber layer, carbon fiber layer and polytetrafluoroethylene layer, such layer structure makes the carton outside all have better water-proof effects with inside, this kind of carton waterproof performance rank is high, but corresponding, cost of manufacture and use cost are all higher, only are applicable to high-grade gift packaging box and use.
At present, polyurethane is coated on the surface of an object, an effective waterproof layer can be formed after the polyurethane is formed into a film, the common knowledge is included, and the polyurethane can form a beautiful color through blending of pigments, so that diversified packaging requirements can be met. But when the polyurethane is directly coated on the surface of corrugated paper, the leveling performance is poor, an obvious hanging flow phenomenon exists, the hardness is also poor after film forming, so that the polyurethane layer is not dirty-resistant, and a polyvinyl chloride layer is arranged between the polyurethane layer and the corrugated paper layer in the prior art, so that the polyvinyl chloride layer can provide a better film forming interface for the polyurethane, the usability of a polyurethane waterproof layer is improved, and the usability of the packaging box is further improved.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide a waterproof carton.
The above object of the present invention is achieved by the following technical solutions: a waterproof paper box is processed from a waterproof paper board, wherein the waterproof paper board comprises a corrugated paper layer and a waterproof layer, the waterproof layer is obtained by curing and film-forming polyurethane resin emulsion, and the polyurethane resin emulsion comprises the following components in parts by mass:
100-150 parts of waterborne polyurethane;
5-7 parts of a leveling agent;
1-2 parts of a curing agent;
30-40 parts of a filler;
2-3 parts of a mildew-proof algaecide;
10-15 parts of pasty lignocellulose;
20-30 parts of paper pulp;
3-4 parts of a dispersing agent;
10-20 parts of a pigment;
1-3 parts of an emulsifier;
70-90 parts of water.
By adopting the technical scheme, the polyurethane coating obtained by the formula has strong surface hydrophobicity, is difficult to suspend in the coating process, has strong operability, is suitable for the automatic coating process, is a waterproof paper box only consisting of the corrugated paper layer and the polyurethane waterproof layer, has simpler preparation process and moderate manufacturing cost, and can meet the market demand. In the formula, the waterborne polyurethane is a novel environment-friendly resin, does not need to use an organic solvent, is more environment-friendly and has less harm to human bodies; the leveling agent can improve the leveling performance of the polyurethane coating process, and the main principle is that the surface tension of the polyurethane resin emulsion is reduced, so that the Tg is reduced, the polyurethane resin emulsion has better permeability, and the polyurethane resin emulsion is better combined with the uneven surface of corrugated paper; the curing agent can improve the formation rate of crystal nuclei in the polyurethane film forming process, and improve the film forming speed and film forming hardness of the polyurethane resin emulsion; the filler has the effects of filling and leveling the uneven surface of the corrugated paper on one hand, and on the other hand, the polyurethane with certain solid content can quickly form a film; the mildew-proof algaecide has the function of preventing the packing box from storing mildew and growing algae for a long time; the pasty lignocellulose can improve the solid content in the polyurethane resin emulsion on one hand and improve the caking property of the resin emulsion and corrugated paper on the other hand; a certain amount of paper pulp is added into the resin emulsion, so that the pH value of the whole resin emulsion can be improved, the resin emulsion obtains an alkaline environment, hydrophilic groups on polyurethane can overflow in a salifying mode in the polyurethane film forming process, a coating film finally obtains a certain hydrophobic property, the waterproof property of the whole paper box is enhanced, and the adhesion of the resin emulsion and corrugated paper can also be improved by adding the paper pulp; the dispersing agent is mainly used for better dispersing all solid substances in the resin emulsion, and the solid substances in the formula mainly comprise pigment, pasty lignocellulose and filler; the pigment can endow various colors to the polyurethane coating, and the solid content in the resin emulsion is improved; the emulsifier helps the pulp to be miscible with the respective substances in the resin emulsion; the water is used as a solvent of the polyurethane resin, and has the advantages of environmental protection and health compared with an organic solvent.
Preferably, the pasty lignocellulose is prepared by mixing a lignocellulose raw material and a 30% sodium hydroxide solution according to the mass ratio of 1:1, stirring uniformly under heating in water bath, controlling the whole mixing time to be 10-15min, and cooling to obtain the pasty lignocellulose.
By adopting the technical scheme, the length of the lignocellulose can be shortened by the sodium hydroxide solution, the lignocellulose is softened, the obtained pasty lignocellulose is easier to disperse in the polyurethane resin emulsion, and the pH value of the polyurethane resin emulsion can be improved by the sodium hydroxide in the pasty lignocellulose in combination with paper pulp, so that the water delivery performance of the glue film is stronger.
Preferably, the paper pulp adopts the residual material of the paper pulp used in the corrugated paper manufacturing process.
By adopting the technical scheme, the production and manufacturing cost can be saved, and the paper pulp used in the production of corrugated paper is directly adopted, so that the paper pulp does not need to be separately prepared when the polyurethane resin emulsion used for the waterproof layer of the paper box is prepared, and the manufacturing process of the waterproof paper box is simplified.
The filler can be any one which can be used by those skilled in the art, and preferably, the filler of the present invention is 2000 mesh heavy calcium carbonate.
By adopting the technical scheme, the 2000-mesh coarse whiting can enable the surface of the polyurethane coating film to be fine and smooth, and provide better impression for consumers.
The mildew-proof algaecide can be any mildew-proof algaecide which can be used by the technicians in the field, and preferably, the mildew-proof algaecide is benzotriazole.
By adopting the technical scheme, the benzotriazole has good mildew and algae resistance, wide antimicrobial spectrum and lasting effect.
The curing agent can be any curing agent which can be used by a person skilled in the art, and preferably, the curing agent of the invention is an aqueous curing agent manufactured by Jingxin Ming science and technology Limited and having a model number of HDI-X80.
By adopting the technical scheme, the HDI-X80 has excellent hydrophilicity, is easy to disperse and does not yellow, the hardness of the polyurethane resin emulsion after film formation can be improved, and the coating film has the characteristic of excellent chemical resistance.
Any dispersant which can be used by a person skilled in the art can be selected as the dispersant, and preferably, the dispersant of the invention is LD-6406 dispersant produced by Lida chemical industry and LD105 dispersant produced by Lida chemical industry, and the mass ratio of the two is 1: 1.
In the preparation process, the LD-6406 dispersant and the LD105 dispersant can be added respectively or mixed together, the LD-6406 has better dispersibility for pigments and fillers, the LD105 dispersant has better dispersibility for lignocellulose and fillers, and the best dispersion effect can be achieved by using the two dispersants.
The leveling agent can be any one which can be used by a person skilled in the art, and preferably, the leveling agent of the present invention is a leveling agent of Michael chemical HY-6410.
By adopting the technical scheme, HY-6410 is a nonionic associated polyurethane rheological modifier, so that the coating film can obtain better leveling property and scrubbing resistance and also has a certain thickening effect.
The colorant can be any aqueous colorant that can be used by those skilled in the art, for example, the colorant can be one or more of titanium white, iron oxide red, and carbon black.
By adopting the technical scheme, the titanium white can enable the coating film to obtain milk white, the iron oxide red can enable the coating film to obtain red, and the carbon black can deepen the color of the coating film.
The emulsifier can be any emulsifier which can be used by a person skilled in the art, and preferably, the emulsifier of the invention is polyether F-6 produced by the federal fine chemical industry.
By adopting the technical scheme, the emulsifier contains a plurality of double bonds, and can be combined with the active hydroxyl at the 6 th position in the fiber, so that the lignocellulose can be better mixed and dissolved with the polyurethane, and the polyurethane resin emulsion can obtain a uniform and stable state.
The second purpose of the invention is to provide a preparation method of the waterproof paper box, the cost of the preparation process is low, and the prepared waterproof paper box has good waterproof performance.
The technical purpose of the invention is realized by the following technical means, comprising the following steps:
step 1, preparing a corrugated board;
step 2, preparing polyurethane resin emulsion;
and 4, cutting, folding, gluing and the like on the waterproof paperboard to obtain the waterproof paper box.
Preferably, in step 3, both sides of the corrugated paper are coated with polyurethane resin emulsion, after one side of the corrugated paper is coated and cured, the other side of the corrugated paper is coated and cured, and the waterproof layer surface subjected to twice baking is used as the inner side of the waterproof paper box.
By adopting the technical scheme, if the polyurethane layers are arranged on the two side surfaces of the corrugated board, the two surfaces of the waterproof paper box can obtain the waterproof effect.
Preferably, in step 2, the preparation method of the polyurethane resin emulsion is as follows: mixing the waterborne polyurethane with water, adjusting the viscosity to 10000-2000cps, adding the flatting agent, the curing agent and the mildew-proof algaecide at a stirring speed of 100r/s, if the stirring speed is increased to 200r/s, sequentially adding the pasty lignocellulose, the emulsifying agent and the paper pulp, stirring for 3-4min, increasing the stirring speed to 300r/s, sequentially adding the filler, the pigment and the dispersing agent, and stirring for 10-15min to obtain the uniform and stable polyurethane resin emulsion.
In summary, the invention includes at least one of the following beneficial technical effects:
firstly, the waterproof paper box only consists of the corrugated paper layer and the polyurethane waterproof layer, the preparation process is simpler, the manufacturing cost is moderate, and the market demand can be met;
secondly, the polyurethane coating film obtained by the formula has strong surface hydrophobicity, is difficult to suspend in the coating process, has strong operability, and is suitable for the automatic coating process;
thirdly, the polyurethane resin emulsion obtained by the formula of the invention is uniform and stable and has good performance.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1;
FIG. 2 is a schematic view showing the structure of the waterproof paperboard of example 1;
FIG. 3 is a schematic view showing the structure of the waterproof paperboard of example 2;
in the figure: 1. a waterproof paper box; 2. a corrugated paper layer; 3. and a waterproof layer.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1
Referring to fig. 1, a waterproof paper box 1 is manufactured from waterproof paperboard.
Referring to fig. 2, the waterproof paperboard of the present embodiment includes a corrugated paper layer 2 and two waterproof layers 3, the two waterproof layers 3 are respectively located on the upper and lower surfaces of the waterproof paperboard, the waterproof layers 3 are obtained by curing a polyurethane resin emulsion to form a film, and the polyurethane resin emulsion includes the following components in parts by mass:
130 parts of waterborne polyurethane;
6 parts of a leveling agent;
1 part of a curing agent;
35 parts of a filler;
3 parts of a mildew-proof algaecide;
13 parts of pasty lignocellulose;
24 parts of paper pulp;
3 parts of a dispersing agent;
16 parts of a pigment;
1 part of an emulsifier;
86 parts of water.
The pasty lignocellulose of the embodiment is prepared by the following method, namely, mixing a lignocellulose raw material and a 30% sodium hydroxide solution according to the mass ratio of 1:1, stirring uniformly under heating in water bath, controlling the whole mixing time to be 10-15min, and cooling to obtain the pasty lignocellulose.
The excess material of the paper pulp used when the corrugated paper is manufactured is adopted in the paper pulp of the embodiment.
In this example, the filler is 2000 mesh heavy calcium carbonate.
Benzotriazole is selected as the mildewproof and algaecide in the embodiment.
In this example, the curing agent was HDI-X80 available from Jingxin Hui Ming science and technology Ltd.
The dispersant in this example was LD-6406 dispersant and LD105 dispersant from Lida chemical production.
The leveling agent of the Mail chemical HY-6410 is selected as the leveling agent in the embodiment. HY-6410 is a nonionic associative polyurethane rheology modifier.
In this example, the pigment is titanium dioxide.
The preparation method of the waterproof paper box 1 of the embodiment comprises the following steps:
step 1, preparing a corrugated board;
step 2, preparing polyurethane resin emulsion;
and 4, cutting, folding, gluing and the like on the waterproof paperboard to obtain the waterproof paper box 1.
In the step 3, both surfaces of the corrugated paper are coated with polyurethane resin emulsion, after one surface of the corrugated paper is coated and cured, the other surface of the corrugated paper is coated and cured, and the 3 surfaces of the waterproof layer which is baked twice are used as the inner side of the waterproof paper box 1.
By adopting the technical scheme, if the polyurethane layers are arranged on the two side surfaces of the corrugated board, the two surfaces of the waterproof paper box 1 can obtain the waterproof effect.
Preferably, in step 2, the preparation method of the polyurethane resin emulsion is as follows: mixing waterborne polyurethane and water, adjusting the viscosity to 10000cps, adding a flatting agent, a curing agent and a mildew-proof and algae-proof agent at a stirring speed of 100r/s, if the stirring speed is increased to 200r/s, sequentially adding pasty lignocellulose, an emulsifier and paper pulp, stirring for 4min, increasing the stirring speed to 300r/s, sequentially adding a filler, a pigment and a dispersing agent, and stirring for 15min to obtain uniform and stable polyurethane resin emulsion.
Example 2
Referring to fig. 3, the shape and structure of the waterproof paper board and the formulation of the polyurethane resin in this embodiment are substantially the same as those in embodiment 1, except that the waterproof paper board in this embodiment is provided with only one waterproof layer 3 and one corrugated paper layer 2, and the waterproof layer 3 is disposed outwardly in the waterproof paper box 1 manufactured and formed in this embodiment. In addition, the colorant in this example is iron oxide red.
Example 3
The shape and structure and the formulation of the polyurethane resin in this example are substantially the same as those in example 1, except that the formulation of the polyurethane resin emulsion in this example is slightly different from that in example 1;
specifically, the polyurethane resin emulsion of the embodiment comprises the following components in parts by mass:
130 parts of waterborne polyurethane;
7 parts of a leveling agent;
1 part of a curing agent;
30 parts of a filler;
3 parts of a mildew-proof algaecide;
10 parts of pasty lignocellulose;
20 parts of paper pulp;
4 parts of a dispersing agent;
10 parts of a pigment;
1 part of an emulsifier;
70 parts of water.
In addition, the colorant in this example was a mixture of carbon black and iron oxide red at a mass ratio of 1: 1.
Example 4
The shape and structure and the formulation of the polyurethane resin in this example are substantially the same as those in example 1, except that the formulation of the polyurethane resin emulsion in this example is slightly different from that in example 1;
specifically, the polyurethane resin emulsion of the embodiment comprises the following components in parts by mass:
100 parts of waterborne polyurethane;
7 parts of a leveling agent;
2 parts of a curing agent;
40 parts of a filler;
3 parts of a mildew-proof algaecide;
15 parts of pasty lignocellulose;
30 parts of paper pulp;
4 parts of a dispersing agent;
20 parts of a pigment;
1 part of an emulsifier;
and 90 parts of water.
Example 5
The shape and structure and the formulation of the polyurethane resin in this example are substantially the same as those in example 1, except that the formulation of the polyurethane resin emulsion in this example is slightly different from that in example 1;
specifically, the polyurethane resin emulsion of the embodiment comprises the following components in parts by mass:
150 parts of waterborne polyurethane;
5 parts of a leveling agent;
1 part of a curing agent;
32 parts of a filler;
2 parts of mildew-proof algaecide;
10 parts of pasty lignocellulose;
26 parts of paper pulp;
3 parts of a dispersing agent;
10 parts of a pigment;
1 part of an emulsifier;
80 parts of water.
Example 5
The shape and structure and the formula of the polyurethane resin in this example are substantially the same as those in example 1, except that the preparation methods of the polyurethane resin emulsion and example 1 in this example are slightly different;
specifically, in step 2 of the preparation process of the polyurethane resin emulsion in this embodiment, the waterborne polyurethane is mixed with water and dissolved, the viscosity is adjusted to 15000cps, the leveling agent, the curing agent and the mildew-proof and algae-proof agent are added at a stirring speed of 100r/s, if the stirring speed is increased to 200r/s, the pasty lignocellulose, the emulsifier and the paper pulp are sequentially added, after stirring for 3min, the stirring speed is increased to 300r/s, the filler, the pigment and the dispersing agent are sequentially added, and stirring is performed for 13min, so as to obtain the uniform and stable polyurethane resin emulsion.
Example 6
The shape and structure and the formula of the polyurethane resin in this example are substantially the same as those in example 1, except that the preparation methods of the polyurethane resin emulsion and example 1 in this example are slightly different;
specifically, in step 2 of the preparation process of the polyurethane resin emulsion in this embodiment, the waterborne polyurethane is mixed with water and dissolved, the viscosity is adjusted to 20000cps, the leveling agent, the curing agent and the mildew-proof and algae-proof agent are added at a stirring speed of 100r/s, if the stirring speed is increased to 200r/s, the pasty lignocellulose, the emulsifier and the paper pulp are sequentially added, after stirring for 4min, the stirring speed is increased to 300r/s, the filler, the pigment and the dispersant are sequentially added, and stirring is performed for 10min, so as to obtain the uniform and stable polyurethane resin emulsion. Comparative example 1A polyurethane resin emulsion prepared from water and aqueous polyurethane alone, having a viscosity of 20000 cps.
The polyurethane resin emulsions obtained in examples 1 to 6 were inspected to obtain the following results:
| leveling property | Hardness of | Scratch resistance | |
| Example 1 | Without hanging flow | H | > 10000 times |
| Example 2 | Without hanging flow | H | > 10000 times |
| Example 3 | Without hanging flow | H | > 10000 times |
| Example 4 | Without hanging flow | H | > 10000 times |
| Example 5 | Without hanging flow | H | > 10000 times |
| Example 6 | Without hanging flow | H | > 10000 times |
| Comparative example 1 | Obvious phenomenon of hanging flow | HB | More than 5000 times |
The evaluation standard of the leveling property is that whether the coating formed after coating has a hanging phenomenon or not is observed, and the test is repeated for 15 times; the hardness test adopts a Rockwell hardness test method; the method for testing the scratch resistance is the method in GB/T23989-2009 test method for the solvent resistance of coatings.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The waterproof paper box is characterized by being processed from a waterproof paper board, wherein the waterproof paper board comprises a corrugated paper layer (2) and a waterproof layer (3), the waterproof layer (3) is obtained by curing and film-forming polyurethane resin emulsion, and the polyurethane resin emulsion comprises the following components in parts by mass:
100-150 parts of waterborne polyurethane;
5-7 parts of a leveling agent;
1-2 parts of a curing agent;
30-40 parts of a filler;
2-3 parts of a mildew-proof algaecide;
10-15 parts of pasty lignocellulose;
20-30 parts of paper pulp;
3-4 parts of a dispersing agent;
10-20 parts of a pigment;
1-3 parts of an emulsifier;
70-90 parts of water.
2. A waterproof carton as claimed in claim 1, wherein: the pasty lignocellulose is prepared by the following method, wherein a lignocellulose raw material and a 30% sodium hydroxide solution are mixed according to the mass ratio of 1:1, stirring uniformly under heating in water bath, controlling the whole mixing time to be 10-15min, and cooling to obtain the pasty lignocellulose.
3. A waterproof carton as claimed in claim 1, wherein: the paper pulp adopts the excess material of the paper pulp used in the corrugated paper manufacturing process.
4. A waterproof carton as claimed in claim 1, wherein: the filler is 2000-mesh coarse whiting.
5. A waterproof carton as claimed in claim 1, wherein: the mildew-proof algaecide is benzotriazole.
6. A waterproof carton as claimed in claim 1, wherein: the curing agent is a water-based curing agent which is produced by Jingxin Huiming science and technology limited and has the model of HDI-X80.
7. A waterproof carton as claimed in claim 1, wherein: the dispersing agent is selected from LD-6406 dispersing agent and LD105 dispersing agent produced by Lida chemical industry.
8. A waterproof carton as claimed in claim 1, wherein: the flatting agent is a Moll chemical HY-6410 flatting agent.
9. A waterproof carton as claimed in claim 1, wherein: the pigment can be one or more of titanium white, iron oxide red and carbon black.
10. A method of making a water-resistant carton as claimed in claims 1 to 9, comprising the steps of:
step 1, preparing a corrugated board;
step 2, preparing polyurethane resin emulsion;
step 3, coating the polyurethane resin emulsion on the surface of the corrugated board in a coating mode, and curing the polyurethane resin emulsion to form a film at 50 ℃ to obtain a waterproof paperboard;
and 4, cutting, folding, gluing and the like on the waterproof paperboard to obtain the waterproof paper box (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113120373A (en) * | 2021-04-20 | 2021-07-16 | 上海紫丹食品包装印刷有限公司 | Plastic-free paper cup and preparation method thereof |
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