CN108611914B - Preparation method of paperboard with high color fastness - Google Patents
Preparation method of paperboard with high color fastness Download PDFInfo
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- CN108611914B CN108611914B CN201810209088.6A CN201810209088A CN108611914B CN 108611914 B CN108611914 B CN 108611914B CN 201810209088 A CN201810209088 A CN 201810209088A CN 108611914 B CN108611914 B CN 108611914B
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
-
- 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
-
- 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
- D21H21/28—Colorants ; Pigments or opacifying 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
- D21H21/34—Ignifugeants
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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
- D21H21/50—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 form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
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Abstract
The invention relates to the technical field of papermaking, in particular to a preparation method of a paperboard with high color fastness, which comprises the following steps: (1) pulping: respectively knocking and debonding softwood pulp with the cellulose concentration of 8-12 wt% and hardwood pulp with the cellulose concentration of 6-10 wt%; (2) wood pulp mixing: mixing softwood pulp and hardwood pulp according to the dry weight ratio of cellulose of 3-4: 1-3; (3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting. The invention reasonably controls the cellulose content of wood pulp, and is beneficial to the infiltration of direct dye to cellulose; and the cellulose can be fully dyed through the matching effect of the color fixing agent and the direct dye, and the binding force of the cellulose and the direct dye molecules is high, so that the paperboard with uniform dyeing, high color fastness and certain mechanical property is obtained.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation method of a paperboard with high color fastness.
Background
The paperboard refers to a paper material with the thickness between paper and paperboard, and the existing color paperboard is applied to wider fields along with the improvement of manufacturing technology, such as being used as a package of goods to replace plastic products, and is more environment-friendly.
The existing paperboard is basically dyed by applying glue on the surface, or a layer of colored paper is attached to the surface of the paperboard, the former easily causes the problems of uneven dyeing and low color fastness, the latter has high processing cost, the integral thickness of the paperboard is increased, the colored paper is also easily damaged, and the attractiveness and the use effect are influenced.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a method for preparing paperboard with high color fastness of in-pulp dyeing.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a paperboard with high color fastness comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 8-12 wt% and hardwood pulp with the cellulose concentration of 6-10 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 3-4:1-3 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
According to the invention, softwood pulp and hardwood pulp are mixed in a proper proportion, so that the prepared paperboard has certain mechanical strength; the cellulose content of wood pulp is reasonably controlled, and the direct dye can infiltrate the cellulose; and the cellulose can be fully dyed by the matching action of the color fixing agent and the direct dye, the binding force of the cellulose and the direct dye molecules is high, and the uniform dispersibility of the direct dye is good, so that the paperboard with uniform dyeing, high color fastness and certain mechanical property is obtained.
Wherein, in the step (1), softwood pulp is knocked down to 15-18 DEG SR, and hardwood pulp is knocked down to 25-30 DEG SR. The degree of kowtowing is an index that reflects the comprehensive drainage degree of difficulty of thick liquids, through the degree of kowtowing of rational regulation and control softwood pulp and hardwood pulp, can effectively reduce the separation from of papermaking in-process dyestuff and cellulose, can strengthen the mechanical properties of card paper.
Wherein, softwood pulp is larch wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fibrous length of the softwood pulp after beating and separating is 0.24-0.32mm, the fibrous length of the hardwood pulp after beating and separating is 0.16-0.22 mm. The aspect ratio of the larch fiber is large, and the wall thickness of the tracheids is large, so that the cardboard has high strength and tension and high bursting index; the tissue structure of the poplar fiber is more compact than that of softwood pulp, contains more hybrid cells, can enhance the stiffness of the paperboard, and has higher absorptivity to direct dye; and then through the control of the fiber length of the beaten larch wood pulp and the poplar wood pulp, the mechanical property and the color fastness of the paperboard can be effectively improved.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 1-3: 1. The internal sizing agent can improve the surface strength of the paperboard, prevent the diffusion and the penetration of water liquid, and can enhance the adsorption effect of cellulose on direct dye molecules by reasonably controlling the variety and the proportion of the sizing agent, thereby improving the color fastness.
The direct dye is a direct red dye, and in the technical scheme of the invention, the direct red dye has higher adhesive force and better appearance compared with other dyes.
The color fixing agent is TCD-R produced by Guangdong Germany fine chemical industry Co., Ltd and/or 2070H produced by Hongmou auxiliary agent Co., Ltd, preferably, the color fixing agent consists of TCD-R and 2070H in a weight ratio of 1-3: 1. The color fixing agent formed by compounding is more beneficial to providing the adhesive force of the direct red dye to cellulose.
In the step (3), the flame-retardant master batch is added into the mixed wood pulp together with the internal sizing agent, the direct dye and the color fixing agent, the flame-retardant master batch is a microsphere with a core-shell structure, the core of the flame-retardant master batch is a mixture of nano red phosphorus and nano aluminum hydroxide, and the shell of the flame-retardant master batch is microcrystalline cellulose.
The flame-retardant master batch is added, so that the paperboard has a certain flame-retardant effect, the appearance effect of red phosphorus is in complement with the direct red dye, and the color layering can be enriched. The mechanism of the flame-retardant master batch is as follows: the nanometer red phosphorus is degraded at high temperature to form white phosphorus, and the white phosphorus and the combined water released by the decomposition of the aluminum hydroxide form oxygen-containing phosphoric acid to promote the carbonization of the microcrystalline cellulose and the cellulose of the paper to form an interlayer, thereby playing a role in flame retardance. The invention also has the advantages that the microcrystalline cellulose is used for coating the nano red phosphorus: the microcrystalline cellulose has good associativity with cellulose in wood pulp, and the problem that the nano red phosphorus is not uniformly mixed with the wood pulp or is easy to agglomerate can be avoided.
The preparation method of the flame-retardant master batch comprises the following steps:
A. dissolving microcrystalline cellulose in ionic liquid according to the mass ratio of 4-10:100 at the temperature of 70-90 ℃ to form microcrystalline cellulose solution;
B. b, adding nano red phosphorus and nano aluminum hydroxide into the microcrystalline cellulose solution obtained in the step A, and uniformly stirring to obtain a turbid liquid, wherein the use amounts of the nano red phosphorus and the nano aluminum hydroxide are 3-6 wt% and 2-4 wt% of the turbid liquid respectively;
C. and D, performing electrostatic spraying on the suspension obtained in the step B to obtain the flame-retardant master batch.
The invention utilizes the regeneration principle of microcrystalline cellulose, can uniformly disperse the nano red phosphorus and the nano aluminum hydroxide and is coated by the regenerated micron-sized microcrystalline cellulose, so that the flame-retardant master batch has the size effects of nano materials and micron materials, has good compatibility with wood pulp fibers and is easy to disperse.
Wherein the particle size of the nano red phosphorus is 60-80nm, and the particle size of the nano aluminum hydroxide is 20-40 nm. The particle size of the nano red phosphorus and the nano aluminum hydroxide is reasonably controlled, so that the nano red phosphorus and the nano aluminum hydroxide can be uniformly mixed and are easily coated by microcrystalline cellulose.
Wherein in the step C, the spraying voltage of electrostatic spraying is 20-40kV, and the spraying temperature is 20-30 ℃. By reasonably controlling the spraying voltage and the spraying temperature, the appearance and the size of the flame-retardant master batch can be effectively controlled, and the flame-retardant master batch with the particle size of 23-47 mu m is obtained and has good dispersibility in wood pulp.
The invention has the beneficial effects that: according to the invention, softwood pulp and hardwood pulp are mixed in a proper proportion, so that the prepared paperboard has certain mechanical strength; the cellulose content of wood pulp is reasonably controlled, and the direct dye can infiltrate the cellulose; and the cellulose can be fully dyed by the matching action of the color fixing agent and the direct dye, the binding force of the cellulose and the direct dye molecules is high, and the uniform dispersibility of the direct dye is good, so that the paperboard with uniform dyeing, high color fastness and certain mechanical property is obtained.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A preparation method of a paperboard with high color fastness comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 10 wt% and hardwood pulp with the cellulose concentration of 8 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 7:4 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
Wherein, in the step (1), softwood pulp is knocked down to 16.5 DEG SR, and hardwood pulp is knocked down to 27.5 DEG SR.
Wherein, softwood pulp is larch wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after beating and separating is 0.28mm, the fiber length of the hardwood pulp after beating and separating is 0.19 mm.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 2: 1.
Wherein the direct dye is a direct red dye.
Wherein the color fixing agent consists of TCD-R and 2070H according to the weight ratio of 2: 1.
In the step (3), the flame-retardant master batch is added into the mixed wood pulp together with the internal sizing agent, the direct dye and the color fixing agent, the flame-retardant master batch is a microsphere with a core-shell structure, the core of the flame-retardant master batch is a mixture of nano red phosphorus and nano aluminum hydroxide, and the shell of the flame-retardant master batch is microcrystalline cellulose.
The preparation method of the flame-retardant master batch comprises the following steps:
A. dissolving microcrystalline cellulose in ionic liquid according to the mass ratio of 7:100 at the temperature of 80 ℃ to form microcrystalline cellulose solution;
B. b, adding nano red phosphorus and nano aluminum hydroxide into the microcrystalline cellulose solution obtained in the step A, and uniformly stirring to obtain a turbid liquid, wherein the use amounts of the nano red phosphorus and the nano aluminum hydroxide are 4.5 wt% and 3 wt% of the turbid liquid respectively;
C. and D, performing electrostatic spraying on the suspension obtained in the step B to obtain the flame-retardant master batch.
Wherein the particle size of the nano red phosphorus is 70nm, and the particle size of the nano aluminum hydroxide is 30 nm.
Wherein, in the step C, the spraying voltage of electrostatic spraying is 30kV, and the spraying temperature is 25 ℃.
Example 2
A preparation method of a paperboard with high color fastness comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 8 wt% and hardwood pulp with the cellulose concentration of 6 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 3:1 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
Wherein, in the step (1), softwood pulp is knocked down to 15 DEG SR, and hardwood pulp is knocked down to 25 DEG SR.
Wherein, softwood pulp is larch wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after beating and separating is 0.24mm, the fiber length of the hardwood pulp after beating and separating is 0.16 mm.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 1: 1.
Wherein the direct dye is a direct red dye.
Wherein the color fixing agent is TCD-R produced by Guangdong Germany fine chemical industry Co.
In the step (3), the flame-retardant master batch is added into the mixed wood pulp together with the internal sizing agent, the direct dye and the color fixing agent, the flame-retardant master batch is a microsphere with a core-shell structure, the core of the flame-retardant master batch is a mixture of nano red phosphorus and nano aluminum hydroxide, and the shell of the flame-retardant master batch is microcrystalline cellulose.
The preparation method of the flame-retardant master batch comprises the following steps:
A. dissolving microcrystalline cellulose in ionic liquid according to the mass ratio of 4:100 at the temperature of 70 ℃ to form microcrystalline cellulose solution;
B. b, adding nano red phosphorus and nano aluminum hydroxide into the microcrystalline cellulose solution obtained in the step A, and uniformly stirring to obtain a turbid liquid, wherein the use amounts of the nano red phosphorus and the nano aluminum hydroxide are 3 wt% and 4 wt% of the turbid liquid respectively;
C. and D, performing electrostatic spraying on the suspension obtained in the step B to obtain the flame-retardant master batch.
Wherein the particle size of the nano red phosphorus is 60nm, and the particle size of the nano aluminum hydroxide is 20 nm.
Wherein, in the step C, the spraying voltage of electrostatic spraying is 20kV, and the spraying temperature is 20 ℃.
Example 3
A preparation method of a paperboard with high color fastness comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 12 wt% and hardwood pulp with the cellulose concentration of 10 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 4:3 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
Wherein, in the step (1), softwood pulp is knocked down to 18 DEG SR, and hardwood pulp is knocked down to 30 DEG SR.
Wherein, softwood pulp is deciduous wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after beating and separating is 0.32mm, the fiber length of the hardwood pulp after beating and separating is 0.22 mm.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 3: 1.
Wherein the direct dye is a direct red dye.
The color fixing agent is 2070H produced by Macro image auxiliary agents Limited in Qingyang markets.
In the step (3), the flame-retardant master batch is added into the mixed wood pulp together with the internal sizing agent, the direct dye and the color fixing agent, the flame-retardant master batch is a microsphere with a core-shell structure, the core of the flame-retardant master batch is a mixture of nano red phosphorus and nano aluminum hydroxide, and the shell of the flame-retardant master batch is microcrystalline cellulose.
The preparation method of the flame-retardant master batch comprises the following steps:
A. dissolving microcrystalline cellulose in ionic liquid according to the mass ratio of 10:100 at the temperature of 90 ℃ to form microcrystalline cellulose solution;
B. b, adding nano red phosphorus and nano aluminum hydroxide into the microcrystalline cellulose solution obtained in the step A, and uniformly stirring to obtain a turbid liquid, wherein the use amounts of the nano red phosphorus and the nano aluminum hydroxide are 6 wt% and 4 wt% of the turbid liquid respectively;
C. and D, performing electrostatic spraying on the suspension obtained in the step B to obtain the flame-retardant master batch.
Wherein the particle size of the nano red phosphorus is 80nm, and the particle size of the nano aluminum hydroxide is 40 nm.
Wherein, in the step C, the spraying voltage of electrostatic spraying is 240kV, and the spraying temperature is 30 ℃.
Example 4
A preparation method of a paperboard with high color fastness comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 10 wt% and hardwood pulp with the cellulose concentration of 8 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 7:4 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
Wherein, in the step (1), softwood pulp is knocked down to 16.5 DEG SR, and hardwood pulp is knocked down to 27.5 DEG SR.
Wherein, softwood pulp is larch wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after beating and separating is 0.28mm, the fiber length of the hardwood pulp after beating and separating is 0.19 mm.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 2: 1.
Wherein the direct dye is a direct blue dye.
Wherein the color fixing agent consists of TCD-R and 2070H according to the weight ratio of 2: 1.
Example 5
A preparation method of a paperboard with high color fastness comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 10 wt% and hardwood pulp with the cellulose concentration of 8 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 7:4 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
Wherein, in the step (1), softwood pulp is knocked down to 16.5 DEG SR, and hardwood pulp is knocked down to 27.5 DEG SR.
Wherein, softwood pulp is larch wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after beating and separating is 0.28mm, the fiber length of the hardwood pulp after beating and separating is 0.19 mm.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 2: 1.
Wherein the direct dye is a direct yellow dye.
Wherein the color fixing agent consists of TCD-R and 2070H according to the weight ratio of 2: 1.
Comparative example 1
A preparation method of paperboard comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 10 wt% and hardwood pulp with the cellulose concentration of 8 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 7:4 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye, a flame retardant and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness.
Wherein, in the step (1), softwood pulp is knocked down to 16.5 DEG SR, and hardwood pulp is knocked down to 27.5 DEG SR.
Wherein, softwood pulp is larch wood pulp, hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after beating and separating is 0.28mm, the fiber length of the hardwood pulp after beating and separating is 0.19 mm.
Wherein the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 2: 1.
Wherein the direct dye is a direct red dye.
Wherein the color fixing agent consists of TCD-R and 2070H according to the weight ratio of 2: 1.
Wherein the flame retardant is nano red phosphorus.
The cardboards of examples 1 to 5 and comparative example 1 were tested and the following test tables were obtained:
from the test data in the above table, it can be seen that the cardboard of the present invention has high mechanical strength, low water absorption and high color fastness, and in terms of color appearance (color difference and color fastness), as the red cardboard is optimal, the influence of the color of the cardboard on the mechanical properties is not great as seen from the comparison of examples 1, 4 and 5, but as seen from the comparison of example 1 with comparative example 1, the direct addition of nano red phosphorus results in a sharp decrease in the mechanical properties.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (8)
1. A preparation method of a paperboard with high color fastness is characterized by comprising the following steps: the method comprises the following steps:
(1) pulping: respectively knocking softwood pulp with the cellulose concentration of 8-12 wt% and hardwood pulp with the cellulose concentration of 6-10 wt% to obtain knocked softwood pulp and knocked hardwood pulp;
(2) wood pulp mixing: mixing the knocked down softwood pulp and the knocked down hardwood pulp according to the dry weight ratio of cellulose of 3-4:1-3 to obtain mixed wood pulp;
(3) papermaking: adding an internal sizing agent, a direct dye and a color fixing agent into the mixed wood pulp, stirring uniformly, and then sequentially carrying out papermaking, pre-drying, coating, post-drying, calendaring and curling and edge cutting to obtain the paperboard with high color fastness;
in the step (3), the flame-retardant master batch is added into the mixed wood pulp together with the internal sizing agent, the direct dye and the color fixing agent, the flame-retardant master batch is a microsphere with a core-shell structure, the core of the flame-retardant master batch is a mixture of nano red phosphorus and nano aluminum hydroxide, and the shell of the flame-retardant master batch is microcrystalline cellulose;
the preparation method of the flame-retardant master batch comprises the following steps:
A. dissolving microcrystalline cellulose in ionic liquid according to the mass ratio of 4-10:100 at the temperature of 70-90 ℃ to form microcrystalline cellulose solution;
B. b, adding nano red phosphorus and nano aluminum hydroxide into the microcrystalline cellulose solution obtained in the step A, and uniformly stirring to obtain a turbid liquid, wherein the use amounts of the nano red phosphorus and the nano aluminum hydroxide are 3-6 wt% and 2-4 wt% of the turbid liquid respectively;
C. and D, performing electrostatic spraying on the suspension obtained in the step B to obtain the flame-retardant master batch.
2. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: and (2) beating softwood pulp to 15-18 DEG SR, and beating hardwood pulp to 25-30 DEG SR.
3. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: the softwood pulp is deciduous wood pulp, the hardwood pulp is poplar wood pulp, in step (1), the fiber length of the softwood pulp after the knocking is 0.24-0.32mm, and the fiber length of the hardwood pulp after the knocking is 0.16-0.22 mm.
4. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: the internal sizing agent consists of alkenyl succinic anhydride and alkyl ketene dimer according to the weight ratio of 1-3: 1.
5. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: the direct dye is a direct red dye.
6. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: the color fixing agent is TCD-R produced by Guangdong Germany fine chemical industry Co., Ltd and/or 2070H produced by Macro-image assistant Co., Ltd.
7. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: the particle size of the nano red phosphorus is 60-80nm, and the particle size of the nano aluminum hydroxide is 20-40 nm.
8. The method for preparing a cardboard with high color fastness according to claim 1, wherein the method comprises the following steps: in the step C, the spraying voltage of electrostatic spraying is 20-40kV, and the spraying temperature is 20-30 ℃.
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