CN115029956A - Card paper and preparation method thereof - Google Patents
Card paper and preparation method thereof Download PDFInfo
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- CN115029956A CN115029956A CN202210657756.8A CN202210657756A CN115029956A CN 115029956 A CN115029956 A CN 115029956A CN 202210657756 A CN202210657756 A CN 202210657756A CN 115029956 A CN115029956 A CN 115029956A
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- coating
- yellowing
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- paperboard
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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
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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
- D21H19/82—Paper comprising more than one coating superposed
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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
- D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances
Abstract
The invention discloses card paper and a preparation method thereof, relates to the technical field of papermaking, and aims to solve the problems of large initial whiteness reduction amount, low stability and high cost after the conventional yellowing inhibitor is added in the preparation process of the card paper. The paperboard comprises a paper base and a coating formed on the surface of the paper base; wherein the paper base and/or the coating layer contain a yellowing inhibiting component, and the yellowing inhibiting component comprises an ultraviolet absorbent and a light stabilizer. The preparation method is used for preparing the paperboard. The paperboard and the preparation method thereof provided by the invention are used for reducing the initial whiteness reduction amount of the paperboard, improving the color phase stability and reducing the cost under the condition of storage or sunlight irradiation.
Description
Technical Field
The invention relates to the field of papermaking, in particular to card paper and a preparation method thereof.
Background
After the paperboard is stored for a certain period of time or irradiated by sunlight, the surface material of the paper reacts with oxygen in the air, and the chemical structure of the surface material is changed, so that the whiteness of the paperboard is reduced to a certain extent. Among them, the higher the degree of oxidation of the paper surface material, the higher the degree of yellowing of the cardboard. When a paper jam is affected by high temperature, ultraviolet rays, and pH environment, the degree of yellowing of the surface material of the paper becomes high.
In actual production, a yellowing inhibitor is added into a pulp layer to achieve the effect of inhibiting yellowing, but the initial color of paper is obviously changed, and the stability of the paper cannot be guaranteed. Meanwhile, the yellowing inhibitor is applied in the slurry, so that the consumption is large, and the required cost is high. Therefore, it is very critical to find a preparation method with less influence on the initial hue of the cardboard, high stability and low cost.
Disclosure of Invention
The invention aims to provide a card paper and a preparation method thereof, which are used for reducing the influence on the initial hue of the card paper, improving the stability and reducing the cost under the condition of storage or sunlight irradiation.
In order to achieve the above purpose, the invention provides the following technical scheme:
a paperboard comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base; wherein the paper base and/or the coating contain the yellowing inhibiting component, and the yellowing inhibiting component comprises an ultraviolet absorbent and a light stabilizer.
Compared with the prior art, the paper base and/or the coating of the paperboard provided by the invention contain a yellowing inhibiting component, wherein the yellowing inhibiting component comprises an ultraviolet absorbent and a light stabilizer. When the yellowing inhibiting component is added into the paper base and/or the coating of the paperboard, a compact protective film is formed on the surface of the paper base and/or the coating by the yellowing inhibiting component, and under the irradiation of sunlight, a light stabilizer in the protective film can generate a particularly stable nitroxide free radical under the action of oxygen, and the diffusion of oxygen molecules is restricted by capturing a high-activity free radical generated by oxidative decomposition of oxygen and converting the high-activity free radical into a relatively stable compound. At the same time, the nitroxide free radicals are released again to carry out the free radical capture again to form a virtuous cycle, thereby achieving the purpose of improving the stability. At this time, the ultraviolet absorber in the protective film can selectively absorb high-energy ultraviolet rays, and release and consume the absorbed energy in the form of energy conversion as heat energy or harmless low-energy radiation, thereby further avoiding photophysical and photochemical decomposition of the paper base and/or the coating due to the absorption of the ultraviolet energy.
The light stabilizer has less dissolution amount and can achieve long-term durability by using a small amount of light stabilizer, and on the basis, the added ultraviolet absorbent and the light stabilizer have a synergistic effect, so that the dosage of reagents is further reduced, the change of the whiteness of the paperboard is reduced on the premise of not influencing the performance of paper, the stability is improved, and the production cost is reduced. And because the yellowing-inhibiting component used in the application can be added into the coating to act, the consumption is small during the addition, and no additional equipment is needed in the addition process, thereby further reducing the production cost.
In a second aspect, the present invention also provides a method for preparing a paperboard, comprising:
a paper substrate is provided.
And forming a coating on the surface of the paper base to obtain the paperboard, wherein the paper base or the coating contains the yellowing inhibiting component.
Compared with the prior art, the beneficial effect of the paperboard provided by the invention is the same as that of the paperboard of the first aspect, and details are not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:
fig. 1 is a schematic structural diagram illustrating a paper jam according to an embodiment of the present invention;
fig. 2 shows a flow diagram of a method for preparing a cardboard according to an embodiment of the invention.
Reference numerals are as follows:
100-paper base, 101-first facing, 102-interlayer, 103-second facing, 200-coating, 201-topcoat, 202-midcoat, 203-basecoat.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In production and life, the paperboard is commonly used for manufacturing cosmetic packaging boxes, business cards, month calendars and certificates, and when the paperboard is stored for a long time or is irradiated by sunlight, the phenomena of whiteness reduction and paper yellowing can occur. To address this problem, pulp making processes and bleaching methods are often optimized to inhibit yellowing, and in addition, a yellowing inhibitor may be applied within the pulp. However, as measured by experiments, although the pigment can play a role in inhibiting the yellowing of the paperboard, the initial hue of the paper is changed, and the stability cannot be guaranteed.
In view of the above problems, embodiments of the present invention provide a cardboard, so that the influence of the cardboard on the hue of the cardboard can be reduced under the conditions of storage or sunlight irradiation, the stability is improved, and the cost is reduced. Fig. 1 is a schematic structural diagram illustrating a cardboard according to an embodiment of the present invention.
As shown in fig. 1, the cardboard is composed of a paper base 100, a yellowing-inhibiting component, and a coating layer 200 formed on a surface of the paper base. The coating is located over the paper substrate. The yellowing-inhibiting component can play a role by being added on the paper base and/or the coating, wherein when the yellowing-inhibiting component is added into the coating for action, the consumption of the yellowing-inhibiting component is small, and additional equipment is not required to be added during the addition, so that the production cost is greatly reduced. The yellow return inhibiting component comprises an ultraviolet absorbent and a light stabilizer.
In specific implementation, a yellowing inhibiting component is added into a paper base and/or a coating of a paperboard, the yellowing inhibiting component can form a layer of compact protective film on the surface of the paper base and/or the coating, under the irradiation of sunlight, a light stabilizer in the protective film can generate a particularly stable nitroxide free radical under the action of oxygen, and the diffusion of oxygen molecules is restricted by capturing a high-activity free radical generated by oxidative decomposition of oxygen and converting the high-activity free radical into a relatively stable compound. At the same time, the nitroxide free radicals are released again to carry out the free radical capture again to form a virtuous cycle, thereby achieving the purpose of improving the stability. At this time, the ultraviolet absorber in the protective film can selectively absorb high-energy ultraviolet rays, and release and consume the absorbed energy in the form of energy conversion as heat energy or harmless low-energy radiation, thereby further avoiding photophysical and photochemical decomposition of the paper base and/or the coating due to the absorption of the ultraviolet energy. By the synergistic effect between the ultraviolet absorbent and the light stabilizer, the dosage of the reagent is reduced, and on the premise of not influencing the performance of paper, the protective film on the paper base and/or the coating is not easy to lose efficacy, so that the paperboard can keep better whiteness for a longer time, the stability is improved, and the production cost is reduced.
In an alternative mode, the paper base in the embodiment of the invention comprises two paper base surface layers and at least one paper base interlayer positioned between the two paper base surface layers, wherein at least one paper base surface layer contains a yellowing-inhibiting component; when the paper-based surface layer contains the yellowing-inhibiting component, the total mass of the ultraviolet absorbent and the light stabilizer accounts for 1-5% of the mass of the fiber oven dry pulp forming the corresponding paper-based surface layer. Wherein the paper-based facing may be a first facing and a second facing.
Illustratively, as shown in FIG. 1, the paper substrate 100 may include a first facing 101, a second facing 103, and an interlayer 102 between the first facing 101 and the second facing 103.
For example: when the paper-based surface layer contains the yellowing inhibiting component, the first surface layer can contain the yellowing inhibiting component, the second surface layer can contain the yellowing inhibiting component, and the first surface layer and the second surface layer can contain the yellowing inhibiting component. When the first surface layer contains the yellowing-inhibiting component, the total mass of the ultraviolet absorbent and the light stabilizer accounts for 1-5% of the mass of the fiber oven dry pulp forming the first surface layer. When the second surface layer contains the yellowing-inhibiting component, the total mass of the ultraviolet absorbent and the light stabilizer accounts for 1-5% of the mass of the fiber oven dry pulp forming the second surface layer. According to the yellowing inhibiting component provided by the embodiment of the invention, the yellowing inhibiting component is added into the paper base surface layer at the wet cloth section, and meanwhile, when the paper base surface layer contains the yellowing inhibiting component, the added ultraviolet absorbent and light stabilizer are used in large amounts, so that although the yellowing inhibiting effect is better, the required cost is greatly improved, and meanwhile, the probability that other chemical products of the paper base layer are influenced by the reagent in the yellowing inhibiting component is greatly improved.
In an alternative form, the coating includes a first coating layer and at least one second coating layer, the at least one second coating layer being disposed between the paper substrate and the first coating layer, the at least one second coating layer including a yellowing inhibiting composition. When the second coating contains the yellowing-inhibiting component, the total mass of the ultraviolet absorbent and the light stabilizer accounts for 1-10% of the mass of the coating forming the corresponding second coating. It should be understood that the coating may be formed on one surface of the paper substrate, or may be formed on both surfaces of the paper substrate. Wherein the first coating layer can be defined as a top coat and the at least one second coating layer can be defined as a middle coat and a bottom coat.
Illustratively, as shown in FIG. 1, when the coating is formed on one surface of the paper substrate, the coating 200 may include a midcoat layer 202, a basecoat layer 203, and a topcoat layer 201, with the midcoat layer 202 and basecoat layer 203 being positioned between the second topcoat layer 103 and topcoat layer 201.
For example: when the coating of the embodiment of the invention contains the yellowing inhibiting component, the intermediate coating can contain the yellowing inhibiting component, the bottom coating can contain the yellowing inhibiting component, and both the intermediate coating and the bottom coating can contain the yellowing inhibiting component. When the middle coating contains the yellowing-inhibiting component, the total mass of the ultraviolet absorbent and the light stabilizer accounts for 1-10% of the mass of the coating forming the middle coating. When the base coat contains the yellowing-inhibiting component, the total mass of the ultraviolet absorber and the light stabilizer accounts for 1 to 10 percent of the mass of the coating forming the base coat. According to the yellowing inhibiting component disclosed by the embodiment of the invention, the yellowing inhibiting component is added into the first coating (the top coating) in the coating section, and the first coating is directly contacted with the external environment, so that the effect of the yellowing inhibiting component can be maximized in the limited yellowing inhibiting component. Since no yellowing inhibitor is added to the second coating (intermediate and primer), the probability of its physical properties being affected by the reagent in the yellowing inhibitor is greatly reduced. Meanwhile, when the yellowing inhibiting component is added into the coating, no additional equipment is needed, so that the production cost is greatly reduced on the premise of ensuring the yellowing inhibiting effect.
Illustratively, the coating of the embodiment of the invention comprises 0.4-0.8 parts by mass of a fluorescent whitening agent, 70-100 parts by mass of calcium carbonate, 0-30 parts by mass of china clay, 5-20 parts by mass of latex, 0.2-1.5 parts by mass of sodium carboxymethyl cellulose, 0.1-1 part by mass of a dispersant, 0.1-1 part by mass of a lubricant and 0.2-1.5 parts by mass of a water repellent agent. The paperboard of the embodiment of the invention can ensure that solid matters of a coating section are uniformly distributed under the combined action of fluorescent whitening agent, calcium carbonate, china clay, sodium carboxymethyl cellulose, latex, dispersant, lubricant, water repellent agent and yellowing inhibition component, and the light stabilizer in the protective film has good compatibility with the coating formula, so that the paperboard can prevent phase separation or loss of efficacy due to rapid permeation and migration in the formation of the protective film. Through the matching of the components, the viscosity of the coating is obviously improved, and the coating is prevented from flowing off, so that the stability of the coating is improved. This explains why the cardboard in the present example has more remarkable stability than the cardboard after the use of the existing yellowing inhibitor. In addition, the fluorescent whitening agent in the coating can assist the ultraviolet absorber to absorb ultraviolet rays, and the ultraviolet absorber has selectivity on the absorption of the ultraviolet rays, so that the fluorescent whitening agent can absorb ultraviolet rays in other bands while the ultraviolet absorber acts in the coating, has a good shielding effect on near ultraviolet rays, and achieves a good yellowing inhibition effect.
For example: the dispersant may be at least one of sodium polyacrylate, alkylphenol ethoxylate, and phosphate (such as sodium hexametaphosphate). The latex may be at least one of styrene-butadiene latex and styrene-acrylic latex. The water-resistant agent can be at least one of amino resin, zirconium salt (such as zirconium sulfate amine and zirconium carbonate amine), modified polyamide polyamine epichlorohydrin resin (modified PAE resin) and polyamide polyurea resin (PAPU), and the lubricant can be at least one of metal soap lubricant (such as calcium stearate), fluorine lubricant (such as perfluoropolyether), sulfated oil and sulfonated oil. The fluorescent whitening agent is triazinyl amino stilbene and comprises at least one of fluorescent whitening agent 71, fluorescent whitening agent 210 and fluorescent whitening agent 24. The embodiment of the invention also provides a preparation method of the paperboard, which can be used for preparing the paperboard of the embodiment of the invention. It will be appreciated that the process of making the paperboard includes a wet end and a coating end. Fig. 2 shows a flow diagram of a method for preparing a cardboard according to an embodiment of the invention. As shown in fig. 2, the method for preparing a paperboard according to an embodiment of the present invention includes:
step 301: a paper substrate is provided.
For example: and adding a yellowing inhibiting component into the pulp at the wet cloth section of at least one layer of paper base to form yellowing inhibiting pulp. The slurry of the wet cloth section can comprise surface slurry, core slurry and bottom slurry, wherein the rest components of the preparation raw material of the wet cloth section can be various wood, waste paper fiber and other plant fiber slurry, such as softwood pulp, hardwood pulp, broke pulp and the like. Chemical pulp is used as the surface pulp, chemical pulp and mechanical pulp are used as the core pulp, and chemical pulp is also used as the bottom pulp.
It should be noted that, in this embodiment, the slurry of the first surface layer may be defined as a surface slurry, the slurry of the interlayer may be defined as a core slurry, and the slurry of the first surface layer may be defined as a bottom slurry.
Step 302: and forming a coating on the surface of the paper base to obtain the paperboard, wherein the paper base and/or the coating contain a yellowing inhibiting component.
For example: and adding a yellowing inhibiting component into at least one layer of coating to form a yellowing inhibiting coating, and coating the yellowing inhibiting coating on the paper base to obtain the paperboard. It is to be understood that the coating material may include a top coating material, a middle coating material and a bottom coating material, wherein the top coating material is the coating material for preparing the first coating layer of the present embodiment, the middle coating material is the coating material for preparing the coating layer of the present embodiment, and the bottom coating material is the coating material for preparing the bottom coating layer of the present embodiment.
In an exemplary embodiment of the invention, after the pulp is made into a paper base, the coating is uniformly coated on the paper base in a coating mode, and then the paper base is dried and calendered to obtain the reversion-resistant paperboard. The coating method may be a roll coating method, a blade coating method, or a flow coating method, or may be other coating methods, which are not described herein.
In the paperboard provided by the invention, the yellowing inhibiting component comprises an ultraviolet absorbent and a light stabilizer. The component can form a compact protective film on the surface of the paper base and/or the coating, and under the irradiation of sunlight, the light stabilizer in the protective film can generate a particularly stable nitroxide free radical under the action of oxygen, and the diffusion of oxygen molecules is restricted by capturing the high-activity free radical generated by the oxidative decomposition of oxygen and converting the high-activity free radical into a relatively stable compound. At the same time, the nitroxide free radicals are released again to carry out the free radical capture again to form a virtuous cycle, thereby achieving the purpose of improving the stability. At this time, the ultraviolet absorber in the protective film can selectively absorb high-energy ultraviolet rays, and release and consume the absorbed energy in the form of energy conversion as heat energy or harmless low-energy radiation, thereby further avoiding photophysical and photochemical decomposition of the paper base and/or the coating due to the absorption of the ultraviolet energy. In addition, the fluorescent whitening agent in the coating can assist the ultraviolet absorber to absorb ultraviolet rays in other bands. The synergistic effect is carried out between the light stabilizer and the ultraviolet absorption reagent, the dosage of the reagent is reduced, and on the premise of not influencing the performance of paper, the protective film on the paper base and/or the coating is not easy to lose efficacy, so that the paperboard can keep better whiteness for a longer time, the stability is improved, and the production cost is reduced.
Therefore, the paperboard provided by the invention can reduce the reduction amount of the whiteness of the paperboard, improve the color phase stability and reduce the cost under the condition of storage or sunlight irradiation.
In order to verify the effect of the paper jam provided by the embodiment of the present invention, the embodiment of the present invention is demonstrated by comparing the embodiment with the comparative example. It should be understood that the components of the various materials referred to in the following examples are representative components, which are only used to demonstrate experimental results and are not intended to limit the scope of the examples of the present invention.
Example one
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts by mass of styrene-butadiene latex, 0.5 part by mass of sodium carboxymethylcellulose, 0.3 part by mass of sodium polyacrylate, 0.5 part by mass of PAPU, 0.3 part by mass of calcium stearate and 0.4 part by mass of fluorescent whitening agent 71, uniformly dispersing to prepare a semi-finished coating, preparing three parts according to the same steps, respectively adding 100 parts by mass of calcium carbonate into two parts of the semi-finished coating, uniformly dispersing to prepare a primary coating and a middle coating, adding 80 parts by mass of calcium carbonate and 20 parts by mass of china clay into the remaining part of the semi-finished coating, uniformly dispersing to prepare a top coating.
Step three, preparing the yellowing-inhibiting primer: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the primer, and stirring uniformly to form the yellowing-inhibiting coating, wherein the middle coating and the top coating are not added. Wherein, the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine accounts for 1 percent of the mass of the primer.
Fourthly, preparing paperboard: sequentially coating the yellowing-inhibiting base coating, the middle coating and the surface coating on the surface of the base paper of the white cardboard, drying and calendering to obtain the coated cardboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a chromatic aberration delta E test after the timing of each time interval is finished.
Example two
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts by mass of styrene-butadiene latex, 0.5 part by mass of sodium carboxymethylcellulose, 0.3 part by mass of sodium polyacrylate, 0.5 part by mass of PAPU, 0.3 part by mass of calcium stearate and 0.4 part by mass of fluorescent whitening agent 71, uniformly dispersing to prepare a semi-finished coating, preparing three parts according to the same steps, respectively adding 100 parts by mass of calcium carbonate into two parts of the semi-finished coating, uniformly dispersing to prepare a primary coating and a middle coating, adding 80 parts by mass of calcium carbonate and 20 parts by mass of china clay into the remaining part of the semi-finished coating, uniformly dispersing to prepare a top coating.
Step three, preparing the yellowing-inhibiting medium coating: adding 2-hydroxy-4-methoxybenzophenone and 4-benzylpiperazine hydrochloride into the middle coating, and uniformly stirring to form the yellowing-inhibiting middle coating, wherein the middle coating and the surface coating are not added. Wherein, the mass of the 2-hydroxy-4-methoxybenzophenone and the 4-benzylpiperazine hydrochloride accounts for 1 percent of the mass of the intermediate coating.
Fourthly, preparing paperboard: bottom with a coverCoating the coating, the middle yellowing-inhibiting coating and the surface coating on the surface of the base paper of the white cardboard in sequence, drying and calendering to obtain the coated cardboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
EXAMPLE III
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts of styrene-butadiene latex, 0.5 part of sodium carboxymethylcellulose, 0.3 part of sodium polyacrylate, 0.5 part of PAPU, 0.3 part of calcium stearate and 0.4 part of fluorescent whitening agent 71, uniformly dispersing to prepare a semi-finished coating, and preparing three parts in the same step. And respectively adding 100 parts by mass of calcium carbonate into the two parts, uniformly dispersing to prepare a primary coat and a middle coat, adding 80 parts by mass of calcium carbonate and 20 parts by mass of china clay into the remaining part, uniformly dispersing to prepare a top coat.
Step three, preparing the yellowing-inhibiting surface coating: adding 2-hydroxy-4-methoxybenzophenone and 4-benzylpiperazine hydrochloride into the top coat, and uniformly stirring to form the yellowing-inhibiting top coat, wherein the middle coat and the bottom coat are not added. Wherein, the mass of the 2-hydroxy-4-methoxybenzophenone and the 4-benzylpiperazine hydrochloride accounts for 1 percent of the mass of the top coating.
Fourthly, preparing paperboard: coating the primary coating, the middle coating and the yellowing-inhibiting surface coating on the surface of the base paper of the white cardboard in sequence, drying and calendering to obtain the coated cardboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
Example four
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts of styrene-acrylic latex, 0.5 part of sodium carboxymethylcellulose, 0.3 part of alkylphenol polyoxyethylene ether, 0.5 part of modified PAE resin, 0.3 part of perfluoropolyether and 0.6 part of fluorescent whitening agent 210, uniformly dispersing to prepare a semi-finished coating, and preparing three parts in the same step. And respectively adding 100 parts by mass of calcium carbonate into the two parts, uniformly dispersing to prepare a bottom coat and a middle coat, adding 70 parts by mass of calcium carbonate and 30 parts by mass of china clay into the remaining part, uniformly dispersing to prepare a top coat.
Step three, preparing the yellowing-inhibiting top coat: adding 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone and 2-imidazolidinone into the top coating, and uniformly stirring to form the yellowing-inhibiting coating, wherein the middle coating and the bottom coating are not added. Wherein the mass of the 2- (2-hydroxy-5-methylphenyl) benzotriazole, the 2-hydroxy-4-methoxybenzophenone and the 2-imidazolidinone accounts for 5% of the mass of the topcoat material.
Step four, preparing paperboard: sequentially coating the primary coating, the middle coating and the yellow-inhibiting surface coating on the surface of the base paper of the white cardboard, drying and calendering to obtain the coated cardboard, and using an aging oven (illumination temperature is 50 ℃, illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
EXAMPLE five
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts of styrene-acrylic latex, 0.5 part of sodium carboxymethylcellulose, 0.3 part of alkylphenol polyoxyethylene ether, 0.5 part of modified PAE resin, 0.3 part of perfluoropolyether and 0.6 part of fluorescent whitening agent 210, uniformly dispersing to prepare a semi-finished coating, and preparing three parts in the same step. And respectively adding 100 parts by mass of calcium carbonate into the two parts, uniformly dispersing to prepare a primary coat and a middle coat, adding 70 parts by mass of calcium carbonate and 30 parts by mass of china clay into the remaining part, uniformly dispersing to prepare a top coat.
Step three, preparing the yellowing-inhibiting coating: respectively adding 2, 4-dihydroxy benzophenone, 2-hydroxy-4-methoxy benzophenone and 4-benzylpiperazine hydrochloride into the middle coating and the top coating, and uniformly stirring to form a first yellow-returning inhibiting coating and a second yellow-returning inhibiting coating, wherein the mass of the 2, 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxy benzophenone and the 4-benzylpiperazine hydrochloride accounts for 2.5% of the mass of the middle coating, and the mass of the 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxy benzophenone and the 4-benzylpiperazine hydrochloride accounts for 2.5% of the mass of the top coating.
Fourthly, preparing paperboard: coating the base coating, the first yellowing-inhibiting coating and the second yellowing-inhibiting coating on the surface of the base paper of the white cardboard in sequence, drying and calendering to obtain the coated cardboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
EXAMPLE six
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
first, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts of styrene-acrylic latex, 0.5 part of sodium carboxymethylcellulose, 0.3 part of alkylphenol polyoxyethylene ether, 0.5 part of modified PAE resin, 0.3 part of perfluoropolyether and 0.6 part of fluorescent whitening agent 210, uniformly dispersing to prepare a semi-finished coating, and preparing three parts in the same step. And respectively adding 100 parts by mass of calcium carbonate into the two parts, uniformly dispersing to prepare a primary coat and a middle coat, adding 70 parts by mass of calcium carbonate and 30 parts by mass of china clay into the remaining part, uniformly dispersing to prepare a top coat.
Step three, preparing the yellowing-inhibiting coating: respectively adding 2, 4-dihydroxy benzophenone, 2-hydroxy-4-methoxybenzophenone and 4-benzylpiperazine hydrochloride into the primer and the intermediate coating, and uniformly stirring to form a first yellowing-inhibiting coating and a second yellowing-inhibiting coating, wherein the mass of the 2, 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxybenzophenone and the 4-benzylpiperazine hydrochloride accounts for 2.5% of the mass of the intermediate coating, and the mass of the 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxybenzophenone and the 4-benzylpiperazine hydrochloride accounts for 2.5% of the mass of the primer.
Fourthly, preparing paperboard: sequentially coating the first yellowing-inhibiting coating, the second yellowing-inhibiting coating and the surface coating on the surface of the base paper of the white cardboard, drying and calendering to obtain the coated cardboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
EXAMPLE seven
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
first, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts of styrene-acrylic latex, 0.5 part of sodium carboxymethylcellulose, 0.3 part of alkylphenol polyoxyethylene ether, 0.5 part of modified PAE resin, 0.3 part of perfluoropolyether and 0.6 part of fluorescent whitening agent 210, uniformly dispersing to prepare a semi-finished coating, and preparing three parts in the same step. And respectively adding 100 parts by mass of calcium carbonate into the two parts, uniformly dispersing to prepare a primary coat and a middle coat, adding 70 parts by mass of calcium carbonate and 30 parts by mass of china clay into the remaining part, uniformly dispersing to prepare a top coat.
Step three, preparing the yellowing-inhibiting coating: 0.4 part by mass of a fluorescent whitening agent 210, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone and 4-benzylpiperazine hydrochloride are respectively added into a base coating and a surface coating and uniformly stirred to form a first yellow-returning inhibiting coating and a second yellow-returning inhibiting coating, wherein the mass of the 2, 4-dihydroxybenzophenone, the 2-hydroxy-4-methoxybenzophenone and the 4-benzylpiperazine hydrochloride accounts for 2.5% of the mass of the surface coating, and the mass of the 4-dihydroxybenzophenone, the 2-hydroxy-4-methoxybenzophenone and the 4-benzylpiperazine hydrochloride accounts for 2.5% of the mass of the base coating.
Fourthly, preparing paperboard: sequentially coating the first yellow-turning inhibiting coating, the middle coating and the second yellow-turning inhibiting coating on the surface of the base paper of the white cardboard, drying and calendering to obtain the coated cardboard, and using an aging oven (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a chromatic aberration delta E test after the timing of each time interval is finished.
Example eight
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Step two, preparing a coating: weighing 15 parts of styrene-acrylic latex, 0.5 part of sodium carboxymethylcellulose, 0.3 part of alkylphenol polyoxyethylene ether, 0.5 part of modified PAE resin, 0.3 part of perfluoropolyether and 0.6 part of fluorescent whitening agent 210, uniformly dispersing to prepare a semi-finished coating, and preparing three parts in the same step. And respectively adding 100 parts by mass of calcium carbonate into the two parts, uniformly dispersing to prepare a primary coat and a middle coat, adding 70 parts by mass of calcium carbonate and 30 parts by mass of china clay into the remaining part, uniformly dispersing to prepare a top coat.
Step three, preparing the yellowing-inhibiting coating: adding 2, 4-dihydroxy benzophenone, 2-hydroxy-4-methoxy benzophenone and 4-benzylpiperazine hydrochloride into the primer, the middle coating and the surface coating respectively, stirring uniformly to form a first yellowing-inhibiting coating, a second yellowing-inhibiting coating and a third yellowing-inhibiting coating, wherein, the mass of the 2, 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxy benzophenone and the 4-benzylpiperazine hydrochloride accounts for 2 percent of the mass of the top coating, the mass of the 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxy benzophenone and the 4-benzylpiperazine hydrochloride accounts for 1 percent of the mass of the bottom coating, and the mass of the 2, 4-dihydroxy benzophenone, the 2-hydroxy-4-methoxy benzophenone and the 4-benzylpiperazine hydrochloride accounts for 2 percent of the mass of the middle coating.
Fourthly, preparing paperboard: sequentially coating the first yellowing-inhibiting coating, the second yellowing-inhibiting coating and the third yellowing-inhibiting coating on the surface of the base paper of the white cardboard, drying and calendering to obtain the coated cardboard, and aging in an aging oven (illumination temperature 50 ℃, illumination intensity 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
In the ninth to fourteenth embodiments of the present invention, chemical softwood pulp was used as the base slurry, chemical hardwood pulp was used as the core slurry, and chemical hardwood pulp was used as the face slurry, and the preparation processes of the base, middle and face coatings were the same as those of the second step in the first embodiment of the present invention.
Example nine
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
step one, preparing a yellowing-inhibiting slurry: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the surface sizing agent, and uniformly stirring to form yellowing-inhibiting surface sizing agent, wherein the core sizing agent and the bottom sizing agent are not added, and the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine accounts for 4% of that of the surface sizing agent.
Secondly, preparing a paper base: and (4) making the base slurry, the core slurry and the yellowing-inhibiting surface slurry into a paper base.
Step three, preparing paperboard: coating the coating on the surface of the paper base, drying and calendering to obtain the coated paperboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
Example ten
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
step one, preparing a yellowing-inhibiting slurry: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the core slurry, and uniformly stirring to form yellowing-inhibiting core slurry, wherein the surface slurry and the bottom slurry are not added, and the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine accounts for 4% of that of the core slurry.
Secondly, preparing a paper base: and (4) manufacturing the base slurry, the yellowing-inhibiting core slurry and the surface slurry into the paper base.
Step three, preparing paperboard: coating the coating on the surface of a paper base, drying and calendaring to obtain coated paperboard, and using an aging oven (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
EXAMPLE eleven
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
step one, preparing a yellowing-inhibiting slurry: respectively adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the surface sizing agent and the core sizing agent, and uniformly stirring to form yellowing-inhibiting surface sizing agent and yellowing-inhibiting core sizing agent, wherein the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine accounts for 2% of the mass of the surface sizing agent, and the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine accounts for 2% of the mass of the core sizing agent.
Secondly, preparing a paper base: and (4) papermaking the bottom sizing agent, the yellowing-inhibiting core sizing agent and the yellowing-inhibiting surface sizing agent to form a paper base.
Step three, preparing paperboard: coating the coating on the surface of a paper base, drying and calendaring to obtain coated paperboard, and using an aging oven (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a chromatic aberration delta E test after the timing of each time interval is finished.
Example twelve
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
step one, preparing slurry: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the core slurry, uniformly stirring to form yellow return inhibiting core slurry, adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the surface slurry, uniformly stirring to form yellow return inhibiting surface slurry, and adding no bottom slurry, wherein the mass of 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine in the yellow return inhibiting core slurry accounts for 2% of that of the core slurry, and the mass of 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine in the yellow return inhibiting surface slurry accounts for 2% of that of the surface slurry.
Secondly, preparing a paper base: and (4) manufacturing the paper base by using the bottom sizing agent, the yellowing-resistant core sizing agent and the yellowing-resistant surface sizing agent.
Step three, preparing a coating: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the top coat, and stirring uniformly to obtain the yellowing-resistant top coat, wherein the middle coat and the bottom coat are not added. Wherein, the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine added into the top coating accounts for 9 percent of the mass of the top coating.
Fourthly, preparing paperboard: sequentially coating the bottom coating, the middle coating and the yellowing-inhibiting surface coating on the surface of the paper base, drying and calendering to obtain the coated paperboard, and aging in an aging oven (illumination temperature 50 ℃, illumination intensity 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
EXAMPLE thirteen
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
step one, preparing slurry: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the core slurry, uniformly stirring to form yellow return inhibiting core slurry, adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the surface slurry, uniformly stirring to form yellow return inhibiting surface slurry, and not adding the bottom slurry, wherein the mass of 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine in the yellow return inhibiting core slurry accounts for 2% of the mass of the core slurry, and the mass of 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine in the yellow return inhibiting surface slurry accounts for 2% of the mass of the surface slurry.
Secondly, preparing a paper base: and (4) making the paper base by using the bottom sizing agent, the yellowing-resistant core sizing agent and the yellowing-resistant surface sizing agent.
Step three, preparing a coating: respectively adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the middle coating and the top coating, and uniformly stirring to obtain a first yellowing-inhibiting coating and a second yellowing-inhibiting coating, wherein the bottom coating is not added. Wherein, the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine added into the top coating accounts for 4.5 percent of the mass of the top coating, and the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine added into the middle coating accounts for 4.5 percent of the mass of the middle coating.
Fourthly, preparing paperboard: sequentially coating the base coat, the first yellowing-inhibiting coating and the second yellowing-inhibiting coating on the surface of the paper base, and drying and calendering to obtain the coatingPaperboard, using aging box (illumination temperature 50 deg.C, illumination intensity 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
Example fourteen
The embodiment of the invention provides a paperboard which comprises a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base.
The preparation method of the paperboard provided by the embodiment of the invention comprises the following steps:
step one, preparing slurry: adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the core slurry, uniformly stirring to form yellow return inhibiting core slurry, adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the surface slurry, uniformly stirring to form yellow return inhibiting surface slurry, and not adding the bottom slurry, wherein the mass of 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine in the yellow return inhibiting core slurry accounts for 2% of the mass of the core slurry, and the mass of 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine in the yellow return inhibiting surface slurry accounts for 2% of the mass of the surface slurry.
Secondly, preparing the paper base: and (4) papermaking the bottom sizing agent, the yellowing-inhibiting core sizing agent and the yellowing-inhibiting surface sizing agent to form a paper base.
Step three, preparing a coating: and respectively adding 2, 4-dihydroxy benzophenone and 2, 4-dimethyl piperidine into the bottom coating, the middle coating and the top coating, and uniformly stirring to obtain a first yellowing-inhibiting coating, a second yellowing-inhibiting coating and a third yellowing-inhibiting coating. Wherein, the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine added into the top coating accounts for 3 percent of the mass of the top coating, the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine added into the middle coating accounts for 3 percent of the mass of the middle coating, and the mass of the 2, 4-dihydroxy benzophenone and the 2, 4-dimethyl piperidine added into the bottom coating accounts for 3 percent of the mass of the bottom coating.
Fourthly, preparing paperboard: sequentially coating the first yellowing-inhibiting coating, the second yellowing-inhibiting coating and the third yellowing-inhibiting coating on the surface of the paper base, drying and calendering to obtain a coated paperboard, and aging in an aging oven (illumination temperature 50 ℃, illumination intensity 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, andand after the timing of each time interval is finished, performing a chromatic aberration delta E test.
Comparative example
The comparative example of the present invention provides a paperboard including a paper base and a coating layer formed on a surface of the paper base.
The preparation method of the paperboard provided by the comparative example comprises the following steps:
in the first step, an uncoated white cardboard base paper is obtained.
Secondly, coating the coating without the yellowing-inhibiting component on the surface of the base paper of the white cardboard, drying and calendering to obtain the coated cardboard, and using an aging box (the illumination temperature is 50 ℃, and the illumination intensity is 500 w/m) 2 ) Aging for 0h, 8h, 16h and 24h, and carrying out a color difference delta E test after the timing of each time interval is finished.
The present invention tests the data relating to the cardboards prepared in the examples and comparative examples, wherein the yellowing inhibiting component was added during the preparation of the coating in all of the examples one to eight and the yellowing inhibiting component was added during the pulping in all of the examples nine to eleven. Twelve to fourteen examples were added to the pulp process and to the paint, and the comparative example one did not contain the yellowing inhibiting component of the example of the invention as compared to the example of the invention. The test results of the examples of the present invention and the comparative examples are as follows:
as can be seen from the above table, the paperboards prepared in the first to eighth embodiments of the present invention all add the yellowing inhibiting component in the coating preparation process, wherein the yellowing inhibiting component is added only to the top coating in the third embodiment, and the color difference is smaller than that of the comparative example, and is smaller than that of the yellowing inhibiting component added to the bottom coating in the first embodiment, and is also smaller than that of the yellowing inhibiting component added to the middle coating in the second embodiment.
In all of the ninth to eleventh embodiments of the present invention, the yellow-returning inhibiting component is added in the slurry preparation process, wherein the color difference of the yellow-returning inhibiting component added to the surface slurry is smaller than that of the comparative example, and is also smaller than that of the core slurry added to the core slurry in the tenth embodiment.
The paper jams prepared in the first to fourteenth embodiments of the present invention all have the yellowing inhibiting component added in the wet end process or the coating process, and compared with the paper without the yellowing inhibiting component, the paper jams in the embodiments of the present invention have a color difference much smaller than that of the comparative examples under the same conditions. In addition, the consumption amount is small when the yellowing inhibiting component is added into the coating, and the coating is more economical. According to the paperboard prepared in the first embodiment to the fourteenth embodiment, the yellowing inhibiting component is added in the pulping process or the coating preparation process, so that the reduction of whiteness of the paperboard can be effectively reduced, the color phase stability is improved, and the cost is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A paperboard is characterized by comprising a paper base, a yellowing inhibiting component and a coating formed on the surface of the paper base; wherein the paper base and/or the coating layer contain the yellowing inhibiting component, and the yellowing inhibiting component comprises an ultraviolet absorbent and a light stabilizer.
2. A paperboard according to claim 1 wherein said uv absorber comprises one or more of 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2- (2-hydroxy-5-methylphenyl) benzotriazole.
3. A cardboard according to claim 1, wherein the light stabilizer comprises one or more of 2, 4-dimethylpiperidine, 4-benzylpiperazine hydrochloride, 2-imidazolidinone.
4. A paperboard according to claim 3, wherein said paper-based comprises two paper-based face layers and at least one paper-based interlayer located between said two paper-based face layers, at least one of said paper-based face layers containing said yellow return inhibiting component;
when the paper-based surface layer contains the yellowing-inhibiting component, the total mass of the ultraviolet absorbent and the light stabilizer accounts for 1-5% of the mass of the fiber oven dry pulp forming the corresponding paper-based surface layer.
5. A paperboard according to claim 3, wherein said coating layer comprises a first coating layer and at least one second coating layer, said at least one second coating layer being disposed between said paper substrate and said first coating layer, said at least one second coating layer containing said yellow return suppressing component;
when the second coating contains the yellowing-inhibiting component, the total mass of the ultraviolet absorber and the light stabilizer accounts for 1-10% of the mass of the coating forming the corresponding second coating.
6. A paperboard according to any of claims 1 to 4, characterized in that said coating comprises optical brighteners, calcium carbonate, china clay, sodium carboxymethylcellulose, latex, dispersants, lubricants and water repellents.
7. A paperboard according to claim 6, characterized in that the fluorescent brightener is 0.4 to 0.8 part by mass, the calcium carbonate is 70 to 100 parts by mass, the china clay is 0 to 30 parts by mass, the latex is 5 to 20 parts by mass, the sodium carboxymethylcellulose is 0.2 to 1.5 parts by mass, the dispersant is 0.1 to 1 part by mass, the lubricant is 0.1 to 1 part by mass, and the water repellent is 0.2 to 1.5 parts by mass.
8. A method for producing a paperboard according to any one of claims 1 to 6, characterized by comprising:
providing a paper base;
and forming a coating on the surface of the paper base to obtain the paperboard, wherein the paper base or the coating contains the yellowing inhibiting component.
9. A method for producing a paperboard according to claim 8, wherein when said paper substrate contains a yellowing-inhibiting component, said providing a paper substrate includes:
adding a yellowing-inhibiting component into the fibers at least one layer of the paper base wet section to form yellowing-inhibiting slurry;
and at least using the yellowing-inhibiting slurry as a raw material to carry out paper-based papermaking.
10. The method for preparing paperboard according to claim 7, wherein when the coating layer contains a yellowing-inhibiting component to form a coating layer on the surface of the paper substrate, the paperboard is obtained, and comprises:
adding a yellowing-inhibiting component to at least one layer of coating paint to form a mixed paint;
and at least coating the mixed coating on the paper base to obtain the paperboard.
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Effective date of registration: 20230118 Address after: Five 510641 mountain road, Guangzhou, Guangdong, Tianhe District Applicant after: SOUTH CHINA University OF TECHNOLOGY Applicant after: WANGUO PAPER SUN WHITE CARDBOARD Co.,Ltd. Address before: 272100 No.66 Xiguan Street, Yanzhou District, Jining City, Shandong Province Applicant before: WANGUO PAPER SUN WHITE CARDBOARD Co.,Ltd. |