CN117127438A - Method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp - Google Patents
Method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp Download PDFInfo
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- CN117127438A CN117127438A CN202311331982.8A CN202311331982A CN117127438A CN 117127438 A CN117127438 A CN 117127438A CN 202311331982 A CN202311331982 A CN 202311331982A CN 117127438 A CN117127438 A CN 117127438A
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- 239000002655 kraft paper Substances 0.000 title claims abstract description 80
- 239000003063 flame retardant Substances 0.000 title claims abstract description 65
- 239000012796 inorganic flame retardant Substances 0.000 title claims abstract description 60
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000000945 filler Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229920002472 Starch Polymers 0.000 claims abstract description 40
- 239000008107 starch Substances 0.000 claims abstract description 40
- 235000019698 starch Nutrition 0.000 claims abstract description 40
- 125000002091 cationic group Chemical group 0.000 claims abstract description 38
- 239000000123 paper Substances 0.000 claims abstract description 25
- 238000002360 preparation method Methods 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 3
- 239000002002 slurry Substances 0.000 claims description 45
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 36
- 239000000725 suspension Substances 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000010009 beating Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 241001301450 Crocidium multicaule Species 0.000 claims description 5
- 238000004537 pulping Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 abstract description 7
- 238000012986 modification Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 239000011122 softwood Substances 0.000 abstract 2
- 239000002245 particle Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000009172 bursting Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001000 micrograph Methods 0.000 description 4
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 241000499895 Bloomeria Species 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000008104 plant cellulose Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or 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
- D21H21/34—Ignifugeants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of flame-retardant paper preparation, and particularly relates to a method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps: carrying out cationic starch coating modification treatment on the inorganic flame-retardant filler; the method takes softwood pulp as a raw material, modified inorganic flame-retardant filler is added into the softwood pulp, and the flame-retardant kraft paper is manufactured by wet process. According to the invention, the cationic starch is coated on the surface of the inorganic flame-retardant filler, so that the binding force between the inorganic flame-retardant filler and plant fibers can be effectively improved, the problem that the surface of kraft paper is dehaired and powder is removed after the inorganic flame-retardant filler is added is solved, and good flame-retardant capability is given to the kraft paper while the excellent mechanical property of the kraft paper is maintained.
Description
Technical Field
The invention belongs to the technical field of flame-retardant paper preparation, and particularly relates to a method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp.
Background
Kraft paper is used as a degradable sheet material which takes renewable resources such as plant cellulose fibers and the like as raw materials, has the advantages of low cost, high strength, light weight and the like, and is widely applied to the field of packaging materials. But kraft paper prepared from plant fibers has poor flame retardant property and serious potential safety hazard in use.
Aluminum hydroxide can be used as an inorganic flame-retardant filler added into the pulp in the kraft paper preparation process, but the binding force between the aluminum hydroxide and cellulose fibers is insufficient, and the direct addition can cause the problems of powder and hair falling on the surface of paper and great reduction of the mechanical strength of kraft paper. Therefore, we propose a method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp.
Disclosure of Invention
The invention aims to provide a method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which is used for effectively improving the binding force between aluminum hydroxide and plant fibers by coating cationic starch on aluminum hydroxide suspension when preparing the inorganic flame-retardant filler, solving the problem of hair and powder falling on the surface of kraft paper after adding unmodified aluminum hydroxide, and endowing the kraft paper with good flame-retardant capability while maintaining excellent mechanical properties.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Preparation of modified inorganic flame-retardant filler
Taking cationic starch, and regulating the system temperature and the gelatinization time to obtain gelatinized cationic starch;
taking an aluminum hydroxide suspension, uniformly dispersing, regulating the temperature of a system, dripping gelatinized cationic starch into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the product;
2) Preparation of flame retardant kraft paper
Pulping the fiber raw material, adding the modified inorganic flame-retardant filler prepared in the step 1) into the pulp, fully fluffing, making into flame-retardant kraft paper base paper, and squeezing and drying the base paper to obtain the flame-retardant kraft paper base paper.
Preferably, the mass fraction of the gelatinized cationic starch in the step 1) is 3% -7%, and the mass fraction of the aluminum hydroxide suspension is 5%.
Preferably, the cationic starch gelatinization process parameters in step 1) are: the temperature of the system is 92 ℃ and the gelatinization time is 30min.
Preferably, the system temperature at which the gelatinized cationic starch is added dropwise to the aluminum hydroxide suspension in step 1) is 70 ℃.
Preferably, the slurry in the step 2) comprises a gold star slurry and a blue star slurry, and the mass ratio of the gold star slurry to the blue star slurry is (3-7): 7-3.
Preferably, the beating degree of the gold star slurry and the blue star slurry is 45 DEG SR.
Preferably, the mass fraction of the modified inorganic flame retardant added in the slurry in the step 2) is 50%.
Preferably, the papermaking is wet papermaking.
Preferably, the drying temperature of the base paper in the step 2) is 105 ℃.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for preparing the flame-retardant kraft paper by adding the inorganic flame-retardant filler into the slurry, through setting the flame-retardant kraft paper components and the preparation process thereof, the cationic starch coated on the surface of the inorganic flame-retardant filler can effectively improve the binding force between aluminum hydroxide and plant fibers, solves the problem that the surface of the kraft paper is subjected to hair and powder removal after the unmodified aluminum hydroxide is added, ensures good flame-retardant capability of the kraft paper while maintaining excellent mechanical properties of the kraft paper, and has wide industrial application prospect.
Drawings
FIG. 1 is a scanning electron microscope image of an inorganic flame retardant filler prepared by the invention before modification.
FIG. 2 is a scanning electron microscope image of the modified inorganic flame retardant filler prepared by the invention.
FIG. 3 is a scanning electron microscope image of kraft paper with ATH added to the slurry prepared according to the invention.
FIG. 4 is a scanning electron microscope image of SATH-added kraft paper in a slurry prepared in accordance with the invention.
FIG. 5 is a chart of combustion test of flame retardant kraft paper made in accordance with the invention.
Detailed Description
The technical scheme of the embodiment of the invention is clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. Other embodiments, which are not creatively obtained by a person of ordinary skill in the art based on the embodiments of the present invention, are all within the protection scope of the present invention.
The invention provides a method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Preparation of modified inorganic flame-retardant filler
Taking cationic starch, regulating the temperature of the system to 92 ℃, and gelatinizing for 30min to obtain gelatinized cationic starch;
taking 300mL of aluminum hydroxide suspension with the mass fraction of 5%, uniformly dispersing, regulating the temperature of the system to 70 ℃, dripping gelatinized cationic starch (calculated as absolute dry aluminum hydroxide) with the mass fraction of 1-7% into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain cationic starch coated aluminum hydroxide, namely the modified inorganic flame retardant filler SATH X (X represents the mass fraction of cationic starch added);
2) Preparation of flame retardant kraft paper
Pulping the fiber raw material, wherein the pulp comprises a golden star pulp and a blue star pulp, the mass ratio of the golden star pulp to the blue star pulp is (3-7), the beating degree is 45 DEG SR, the modified inorganic flame-retardant filler (calculated by absolute dry pulp) with the mass fraction of 50% prepared in the step 1) is added into the pulp, the pulp is fully defiberized, the flame-retardant kraft paper base paper is manufactured, and the base paper is pressed and dried at 105 ℃ to obtain the flame-retardant kraft paper. The paper making adopts a wet paper making method.
The target ration of the flame retardant kraft paper in the invention is 120g/m 2 。
Example 1
A method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Preparation of modified inorganic flame-retardant filler
Taking cationic starch, regulating the temperature of the system to 92 ℃, and gelatinizing for 30min to obtain gelatinized cationic starch;
taking 300mL of aluminum hydroxide suspension with the mass fraction of 5%, uniformly dispersing, regulating the temperature of the system to 70 ℃, dripping gelatinized cationic starch with the mass fraction of 3% (calculated as absolute dry aluminum hydroxide) into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the modified inorganic flame retardant filler SATH 3 ；
2) Preparation of flame retardant kraft paper
Mixing the star-shaped slurry and the star-shaped slurry, wherein the mass ratio of the star-shaped slurry to the star-shaped slurry is 5:5, the beating degree is 45 DEG SR, and SATH with the mass fraction of 50% is added 3 Dispersing the suspension (based on absolute dry pulp), fully fluffing, performing wet forming to obtain kraft base paper, squeezing the base paper, and drying at 105 ℃ to obtain the flame-retardant kraft.
The fire-retardant kraft paper obtained by the preparation method has the ration of 120.02g/m 2 The inorganic flame-retardant filler content is 35.1%, the bursting strength is 580KPa, the tearing strength is 1341mN, and the water absorption is 27.8g/m 2 The LOI value is greater than 25%.
Example 2
A method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Modified inorganic flame-retardant filler
Taking cationic starch, regulating the temperature of the system to 92 ℃, and gelatinizing for 30min to obtain gelatinized cationic starch;
taking 300mL of aluminum hydroxide suspension with the mass fraction of 5%, uniformly dispersing, regulating the temperature of the system to 70 ℃, dropwise adding gelatinized cationic starch with the mass fraction of 5% (calculated as absolute dry aluminum hydroxide) into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the modified inorganic flame retardant SATH 5 The surface topography is shown in figure 2;
2) Preparation of flame retardant kraft paper
Mixing the star-shaped slurry and the star-shaped slurry, wherein the mass ratio of the star-shaped slurry to the star-shaped slurry is 5:5, the beating degree is 45 DEG SR, and SATH with the mass fraction of 50% is added 5 Dispersing the suspension (based on absolute dry pulp), thoroughly fluffing, wet forming to obtain kraft base paper, squeezing the base paper, and standing at 105deg.CAnd drying to obtain the flame-retardant kraft paper, wherein the combustion test result is shown in figure 5.
The fire-retardant kraft paper obtained by the preparation method has the quantitative ratio of 120.13g/m 2 The inorganic flame-retardant filler content is 35.3%, the bursting strength is 608KPa, the tearing strength is 1377mN, and the water absorption is 28.2g/m 2 The LOI value is greater than 25%.
Example 3
A method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Preparation of modified inorganic flame-retardant filler
Taking cationic starch, regulating the temperature of the system to 92 ℃, and gelatinizing for 30min to obtain gelatinized cationic starch;
taking 300mL of aluminum hydroxide suspension with the mass fraction of 5%, uniformly dispersing, regulating the temperature of the system to 70 ℃, dropwise adding 7% of gelatinized cationic starch (calculated as absolute dry aluminum hydroxide) into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the modified inorganic flame retardant SATH 7 ；
2) Preparation of flame retardant kraft paper
Mixing the star-shaped slurry and the star-shaped slurry, wherein the mass ratio of the star-shaped slurry to the star-shaped slurry is 5:5, the beating degree is 45 DEG SR, and SATH with the mass fraction of 50% is added 7 Dispersing the suspension (based on absolute dry pulp), fully fluffing, performing wet forming to obtain kraft base paper, squeezing the base paper, and drying at 105 ℃ to obtain the flame-retardant kraft.
The fire-retardant kraft paper obtained by the preparation method has a ration of 120.09g/m 2 The inorganic flame-retardant filler content is 35.4%, the bursting strength is 612KPa, the tearing strength is 1479mN, and the water absorption is 28.4g/m 2 The LOI value is greater than 25%.
Example 4
A method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Preparation of modified inorganic flame-retardant filler
Taking cationic starch, regulating the temperature of the system to 92 ℃, and gelatinizing for 30min to obtain gelatinized cationic starch;
taking 300mL of aluminum hydroxide suspension with the mass fraction of 5%, uniformly dispersing, regulating the temperature of the system to 70 ℃, dropwise adding gelatinized cationic starch with the mass fraction of 3% (calculated as absolute dry aluminum hydroxide) into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the modified inorganic flame retardant SATH 3 ；
2) Preparation of flame retardant kraft paper
Mixing the star-shaped slurry and the star-shaped slurry, wherein the mass ratio of the star-shaped slurry to the star-shaped slurry is 7:3, the beating degree is 45 DEG SR, and SATH with the mass fraction of 50% is added 3 Dispersing the suspension (based on absolute dry pulp), fully fluffing, performing wet forming to obtain kraft base paper, squeezing the base paper, and drying at 105 ℃ to obtain the flame-retardant kraft.
The fire-retardant kraft paper obtained by the preparation method has a ration of 120.07g/m 2 The inorganic flame-retardant filler content is 35.4%, the bursting strength is 592KPa, the tearing strength is 1401mN, and the water absorption is 28.1g/m 2 The LOI value is greater than 25%.
Example 5
A method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which comprises the following steps:
1) Preparation of modified inorganic flame retardant
Taking cationic starch, regulating the temperature of the system to 92 ℃, and gelatinizing for 30min to obtain gelatinized cationic starch;
taking 300mL of aluminum hydroxide suspension with the mass fraction of 5%, uniformly dispersing, regulating the temperature of the system to 70 ℃, dropwise adding gelatinized cationic starch with the mass fraction of 5% (calculated as absolute dry aluminum hydroxide) into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the modified inorganic flame retardant SATH 5 ；
2) Preparation of flame retardant kraft paper
Mixing the star-shaped slurry and the star-shaped slurry, wherein the mass ratio of the star-shaped slurry to the star-shaped slurry is 7:3, the beating degree is 45 DEG SR, and SATH with the mass fraction of 50% is added 5 Dispersing the suspension (based on absolute dry pulp), fully fluffing, performing wet forming to obtain kraft base paper, squeezing the base paper, and drying at 105 ℃ to obtain the flame-retardant kraft.
The fire-retardant kraft paper obtained by the preparation method has a ration of 120.11g/m 2 The inorganic flame-retardant filler content is 35.4%, the bursting strength is 635KPa, the tearing strength is 1513mN, and the water absorption is 28.4g/m 2 The LOI value is greater than 25%.
The product prepared by the invention is subjected to experimental analysis, the product prepared by the invention is taken as an experimental object, and referring to fig. 1 to 5, fig. 1 is an SEM image of inorganic flame-retardant filler ATH before modification, and fig. 2 is an SEM image of inorganic flame-retardant filler SATH after modification. The results of the scanning electron microscope of FIG. 1 show that the unmodified ATH particles are smaller and smooth in surface and are distributed more dispersedly. The results of the scanning electron microscope in FIG. 2 show that the SATH obtained after modification has rough surface, irregular shape and larger particles. This is due to the formation of a coating on the ATH surface of the starch, which leads to the agglomeration of the starch.
Fig. 3 and fig. 4 are SEM images of kraft paper with equal amounts of ATH and SATH added into the pulp, respectively, and the scanning electron microscope results in fig. 3 show that the unmodified ATH is only simply filled in the pores formed by the plant fibers, and the bonding or adsorption effect between the fibers is poor; from the results of the scanning electron microscope shown in fig. 4, it is shown that the modified SATH particles are mutually bonded into clusters under the action of the cationic starch, a part of the SATH particles are filled among fiber pores, a part of the SATH particles are firmly attached to the fibers, and the SATH particles with positive charges and surface-distributed hydroxyl groups have better adsorption and bonding effects with the fibers.
Fig. 5 is a combustion test chart of flame-retardant kraft paper, which shows the combustion effects after ignition for 1s, after ignition for 5s and after ignition for 10s, respectively, from left to right, the upper half of the kraft paper without any flame-retardant filler added in the slurry, and the lower half of the kraft paper with SATH added in the slurry. Kraft paper without any inorganic flame retardant filler added into the slurry can be ignited and quickly burnt, and the kraft paper is burnt out after 10 seconds; in contrast, the flame-retardant kraft paper added with SATH in the pulp is not combusted after being ignited for many times, and the flame-retardant effect is obvious.
In summary, from fig. 1, fig. 2 and fig. 3, it can be concluded that the gelatinized cationic starch can be coated on the surface of aluminum hydroxide, so as to improve the binding capacity of aluminum hydroxide and cellulose fiber, thereby reducing the influence of inorganic flame retardant filler on the mechanical strength of kraft paper; meanwhile, the modified inorganic flame-retardant filler can effectively improve the flame retardant property of kraft paper and endow the kraft paper with good flame retardant capability.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the above embodiments, or equivalents may be substituted for some of the technical features thereof. Modifications, equivalents, improvements, etc. which fall within the spirit and scope of the principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A method for preparing flame-retardant kraft paper by adding inorganic flame-retardant filler into pulp, which is characterized by comprising the following steps:
1) Preparation of modified inorganic flame-retardant filler
Taking cationic starch, and regulating the system temperature and the gelatinization time to obtain gelatinized cationic starch;
taking an aluminum hydroxide suspension, uniformly dispersing, regulating the temperature of a system, dripping gelatinized cationic starch into the aluminum hydroxide suspension, stirring, standing for precipitation, drying and grinding to obtain the product;
2) Preparation of flame retardant kraft paper
Pulping the fiber raw material, adding the modified inorganic flame-retardant filler prepared in the step 1) into the pulp, fully fluffing, making into flame-retardant kraft paper base paper, and squeezing and drying the base paper to obtain the flame-retardant kraft paper base paper.
2. The method for preparing the flame-retardant kraft paper by adding the inorganic flame-retardant filler into the slurry according to claim 1, wherein the mass fraction of the gelatinized cationic starch in the step 1) is 3-7%, and the mass fraction of the aluminum hydroxide suspension is 5%.
3. The method for preparing the flame-retardant kraft paper by adding the inorganic flame-retardant filler into the slurry according to claim 1, wherein the cationic starch gelatinization process parameters in the step 1) are as follows: the temperature of the system is 92 ℃ and the gelatinization time is 30min.
4. The method for preparing a flame retardant kraft paper by adding an inorganic flame retardant filler into a slurry according to claim 1, wherein the system temperature at which the gelatinized cationic starch is dropped into the aluminum hydroxide suspension in step 1) is 70 ℃.
5. The method for preparing the flame-retardant kraft paper by adding the inorganic flame-retardant filler into the slurry according to claim 1, wherein the slurry in the step 2) comprises a gold star slurry and a blue star slurry, and the mass ratio of the gold star slurry to the blue star slurry is (3-7): 7-3.
6. The method for preparing fire-retardant kraft paper by adding inorganic fire-retardant filler into pulp according to claim 1 or 5, wherein the beating degree of the goldband pulp and the stark pulp are 45 ° SR.
7. The method for preparing the flame-retardant kraft paper by adding the inorganic flame-retardant filler into the slurry according to claim 1, wherein the mass fraction of the modified inorganic flame retardant added into the slurry in the step 2) is 50%.
8. The method of preparing flame retardant kraft paper with the addition of inorganic flame retardant filler to pulp of claim 1, wherein the papermaking is wet papermaking.
9. The method for preparing fire-retardant kraft paper by adding inorganic fire-retardant filler into pulp according to claim 1, wherein the drying temperature of the raw paper in the step 2) is 105 ℃.
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|---|---|---|---|---|
| JPH06287894A (en) * | 1992-04-20 | 1994-10-11 | Tokushu Seishi Kk | Flameproofing paper and its production |
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2023
- 2023-10-16 CN CN202311331982.8A patent/CN117127438A/en active Pending
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|---|---|---|---|---|
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| CN103290721A (en) * | 2013-05-21 | 2013-09-11 | 牡丹江恒丰纸业股份有限公司 | Production method of tipping base paper for flame-retardant cigarettes |
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| 安俊健;: "阳离子淀粉/氢氧化铝加填体系的应用研究", 天津造纸, no. 04, 15 December 2013 (2013-12-15), pages 2 - 6 * |
| 祝磊;杨仁党;罗家豪;刘德桃;杨飞;: "阻燃植物纤维模塑墙体装饰材料的制备", 中国造纸, no. 02, 15 February 2013 (2013-02-15), pages 6 - 11 * |
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