CN110644289B - Laminated board base paper and production process thereof - Google Patents
Laminated board base paper and production process thereof Download PDFInfo
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- CN110644289B CN110644289B CN201910974785.5A CN201910974785A CN110644289B CN 110644289 B CN110644289 B CN 110644289B CN 201910974785 A CN201910974785 A CN 201910974785A CN 110644289 B CN110644289 B CN 110644289B
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
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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
- 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
- D21H17/10—Phosphorus-containing compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/51—Triazines, e.g. melamine
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/64—Alkaline compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
- D21H21/34—Ignifugeants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
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Abstract
The invention provides laminated board base paper and a production process thereof, belongs to the technical field of pulping and papermaking, and aims to ensure that the laminated board base paper has good appearance quality and insulating property on the premise that the laminated board base paper is not easy to warp. The production process comprises the following steps: utilizing a hydrapulper to carry out disintegration on 100% bleached wood pulp to obtain disintegrated pulp; carrying out free pulping on the crushed pulp by using a mode of connecting a fluffer and a disc grinder in series, and adding a chelating agent into the crushed pulp to obtain qualified pulp; 100% bleached wood pulp contains 14-30% of pentosan; passing the qualified pulp through a first-stage three-section purification system for good pulp countercurrent, diluting the qualified pulp by a white water tower and flushing the qualified pulp by a flushing pump, and then sending the qualified pulp to a pressure screen for screening to obtain screened pulp; forming wet paper by using the qualified slurry to obtain a wet paper web; carrying out post-treatment on the wet paper web to obtain base paper; and (3) immersing the base paper into the impregnation liquid for impregnation treatment, and then performing post-treatment to obtain the base paper of the laminated board.
Description
Technical Field
The invention belongs to the technical field of pulping and papermaking, and particularly relates to laminated board base paper and a production process thereof.
Background
The base paper of the high-insulation laminated board is mainly used for impregnating and absorbing substances such as epoxy resin or phenolic resin and the like so as to change the appearance or properties of base paper to meet certain special requirements. The high dip-soldering resistance laminated board base paper is used as a main substrate material in the manufacture of printed circuit boards, and has two main functions of insulation, support and the like. The performance, quality, level of processing in manufacturing, cost, and the like of the printed wiring board greatly depend on the substrate material. The board base paper is used as base paper for dipping industry and is mainly a base material for producing a copper-clad laminate of a printed circuit board.
The prior art discloses a production process of high-temperature-resistant and pressure-resistant liner paper, which comprises the steps of mixing and preparing softwood pulp and eucalyptus pulp, mixing and crushing pulp, defibering, pulping, pulp preparation, adding a flame retardant and a wet strength agent, diluting and thickening, performing countercurrent one-stage and three-stage purification and screening on fine pulp, flushing and screening, molding a net part, squeezing, drying, curling and rewinding, and finally preparing the high-temperature-resistant and pressure-resistant liner paper meeting the requirements of customers, wherein the high-temperature-resistant and pressure-resistant liner paper can be used as impregnated flame-retardant copper foil-clad base paper for manufacturing printed circuit boards. However, such a high temperature and pressure resistant liner paper is liable to cause problems such as warping and deformation. Meanwhile, the inventor also finds that the red and dark bottom color of the base paper of the laminated board with high dip soldering resistance after dipping the base paper seriously affects the appearance quality and the insulation property of the paper electrical insulation laminated board.
Disclosure of Invention
The invention aims to provide laminated board base paper and a production process thereof, which are used for ensuring that the laminated board base paper has good appearance quality, insulating property and flame retardant property on the premise that the laminated board base paper is not easy to warp.
In order to achieve the purpose, the invention provides a production process of laminated board base paper. The production process of the base paper of the laminated plate comprises the following steps:
firstly, utilizing a hydrapulper to carry out pulping on 100% bleached wood pulp to obtain pulping pulp; adding a chelating agent into the crushed pulp, and performing free pulping on the crushed pulp by using a mode of connecting a fluffer and a disc grinder in series to obtain qualified pulp; the 100% bleached wood pulp contains 14% -30% of pentosan;
secondly, passing the qualified pulp through a first-stage three-section purification system for good pulp countercurrent, diluting the qualified pulp by a white water tower and flushing the qualified pulp by a flushing pump, and then sending the qualified pulp to a pressure screen for screening to obtain screened pulp; forming wet paper by using the qualified slurry to obtain a wet paper web; carrying out post-treatment on the wet paper web to obtain base paper;
and thirdly, soaking the base paper into a flame retardant dipping solution for dipping treatment, and then carrying out post-treatment to obtain the base paper of the laminated board.
Compared with the prior art, in the production process of the laminated board base paper, the 100% bleached wood pulp has the pentosan content of 14-30%, and the pentosan can effectively inhibit the deformation of the laminated board base paper in the laminated board base paper, so that the copper-clad plate made of the laminated board base paper has small size change rate. At the moment, on the premise that the laminated board base paper produced by the production process of the laminated board base paper provided by the invention is not easy to warp and deform, the laminated board base paper has excellent dip soldering resistance, and the tracking resistance index can reach the level of 800V, even more than 800V, so that the laminated board base paper produced by the production process of the laminated board base paper provided by the invention has good insulating property. And moreover, the base paper is immersed in the flame retardant impregnating solution for impregnation treatment, so that the obtained base paper of the base plate has good flame retardant property.
In addition, in the process of free pulping of the crushed pulp by using the mode of connecting the fluffer and the disc grinder in series, the chelating agent is added into the crushed pulp, so that the chelating agent can generate a complexing reaction with metal ions, particularly iron ions, in the pulping process to generate a soluble complex. When the size mixing slurry is sent to a pressure screen for screening after passing through a first-stage three-section purification system for good pulp countercurrent, the dilution of a white water tower and the pulp flushing of a pulp flushing pump, the soluble complex can run off along with white water, so that metal ions existing in the qualified slurry are eliminated, the whiteness of the base paper of the laminated board is improved, and the appearance quality of the base paper of the laminated board is improved.
The invention also provides the base paper of the laminated plate. The production process of the base paper of the laminated board adopting the technical scheme comprises the following steps: quantification of the base paper of the laminate: 135 +/-3 g/square meter, 0.270 +/-0.020 mm in thickness, whiteness not less than 88, transverse wet strength not less than 0.50 kgf/15 mm, longitudinal wet strength not less than 0.60 kgf/15 mm, transverse liquid absorption height 85mm +/-10/10 min, longitudinal liquid absorption height 90mm +/-10/10 min, limit oxygen index not less than 30%, flame continuing performance V-0 level, heat resisting time at 130 ℃ of 30min, tracking resistance not less than 800V, no foaming and no layering.
Compared with the prior art, the beneficial effects of the base paper of the laminated plate provided by the invention are the same as those of the production process of the base paper of the laminated plate, and are not repeated herein.
Drawings
Fig. 1 is a process diagram of a process for producing a base paper of a laminated board according to an embodiment of the present invention;
fig. 2 is a process flow chart of a production process of the laminated board base paper provided by the embodiment of the invention.
Detailed Description
In order to better understand the invention, the following examples are further described, and it should be noted that the scope of the claimed invention is not limited to the described examples.
Example one
The embodiment of the invention provides a production process of laminated plate base paper. The production process of the base paper of the laminated plate comprises the following steps:
step 100: the method comprises the steps of utilizing a hydrapulper to carry out disintegration on 100% bleached wood pulp to obtain disintegrated pulp, adding a chelating agent into the disintegrated pulp, and utilizing a mode of connecting a fluffer and a disc grinder in series to carry out dissociative pulping on the disintegrated pulp to obtain qualified pulp. The chelating agent is added into the crushed pulp in the free pulping process, so that the chelating agent is uniformly dispersed in the crushed pulp, and the chelating agent can capture metal ions in the crushed pulp to the maximum extent so as to fully exert the metal ion chelating capacity of the chelating agent. In this case, 100% bleached wood pulp contains an appropriate amount of pentosan, and can satisfy the dimensional stability requirement of the base paper of the high-insulation laminated board with respect to the base paper. For example: the warping ratio is relatively low when the 100% bleached wood pulp contains 14% to 30% pentosan.
Step 200: passing the qualified pulp through a first-stage three-section purification system for good pulp countercurrent, diluting the qualified pulp by a white water tower and flushing the qualified pulp by a flushing pump, and then sending the qualified pulp to a pressure screen for screening to obtain screened pulp; forming wet paper by using the qualified slurry to obtain a wet paper web; and carrying out post-treatment on the wet paper web to obtain base paper. When the qualified pulp is sent to a pressure screen for screening after passing through a first-stage three-section purification system for good pulp countercurrent, the dilution of a white water tower and the pulp flushing of a fan pump, a soluble complex formed by a chelating agent and metal ions can be lost along with white water, so that the upper-wire pulp is ensured to be almost free of metal ions, and the whiteness of the base paper of the laminated board is improved.
Step 300: and (3) soaking the base paper in the flame retardant soaking solution for soaking treatment, and then performing post-treatment to obtain the base paper of the laminated board.
Therefore, in the production process of the laminated board base paper provided by the embodiment of the invention, the 100% bleached wood pulp has the pentosan content of 14-30%, and the pentosan can effectively inhibit the deformation of the laminated board base paper in the laminated board base paper, so that the copper-clad plate manufactured by the laminated board base paper has small size change rate. At the moment, on the premise that the laminated board base paper produced by the production process of the laminated board base paper provided by the invention is not easy to warp and deform, the laminated board base paper has excellent dip soldering resistance, and the tracking resistance index can reach the level of 800V, even more than 800V, so that the laminated board base paper produced by the production process of the laminated board base paper provided by the invention has good insulating property. And moreover, the base paper is immersed in the flame retardant impregnating solution for impregnation treatment, so that the obtained base paper of the base plate has good flame retardant property.
In the prior art, in the process of dipping and processing some high-insulation laminated plate base paper, excessive metal ions, particularly iron ions, in paper sheets generate a complex reaction with a chelate to generate complexes with certain colors, so that the appearance quality and the performance of an insulation pressing plate are seriously influenced because the color of a paper electrical insulation laminated plate pressed after dipping is reddish brown (the normal color is transparent faint yellow). In the production process of the laminated board base paper provided by the embodiment of the invention, the defibering machine and the disc grinder are connected in series to carry out free pulping on the crushed pulp, and the chelating agent is added into the crushed pulp, so that the chelating agent can carry out a complexing reaction with metal ions, particularly iron ions, in the pulping process to generate a soluble complex. When the size mixing slurry is sent to a pressure screen for screening after passing through a first-stage three-section purification system for good pulp countercurrent, the dilution of a white water tower and the pulp flushing of a pulp flushing pump, the soluble complex can run off along with white water, so that metal ions existing in the qualified slurry are eliminated, the whiteness of the base paper of the laminated board is improved, and the appearance quality of the base paper of the laminated board is improved. Therefore, in the production process of the laminated board base paper provided by the embodiment of the invention, the adding sequence of the chelating agent is adjusted, and when the upper wire sizing agent is obtained by combining, the qualified sizing agent is sent to a pressure screen for screening after passing through a first-stage three-section purification system for good pulp countercurrent, the dilution of a white water tower and the sizing of a sizing pump, so that the whiteness of the produced laminated board base paper is effectively improved. In other words, the production process of the base paper of the laminated plate provided by the embodiment of the invention only adjusts the adding sequence of the chelating agent, so that the whiteness of the base paper of the laminated plate can be effectively improved, and the method is simple and reliable and has low cost.
In some embodiments, the 100% bleached wood pulp is wood pulp made from hardwood pulp. The ash content of the above bleached pulp is less than 3%. For example: the ash content of the bleached pulp is less than 1%. At this time, the insulating property of the produced laminated board base paper is relatively good, so that the breakdown voltage of the paper substrate applying the laminated board base paper is greatly reduced.
In order to ensure that the laminated board base paper meeting the requirements can be produced by the production process of the laminated board base paper, in the first step, 100% bleached wood pulp is pulped by using a hydrapulper to obtain pulped pulp; the defibering machine and the disc grinder are connected in series to carry out free pulping on the crushed pulp, so that the beating degree of the crushed pulp is controlled between 20 DEG SR and 23 DEG SR, and the wet weight of the fiber is 1.0g to 1.3 g. At the moment, the laminated board base paper produced by the qualified pulp processed by the processing mode has the characteristics of uniform and consistent water absorption height, small longitudinal and transverse differences of tensile strength of the paper, small longitudinal and transverse differences of thermal shrinkage of the paper and expansion after soaking, low water content of the paper, small soaking expansion and thermal shrinkage of the paper and the like.
In some embodiments, the chelating agent is used in an amount of 1kg/t to 3kg/t of oven-dried pulp, and the chelating agent can substantially chelate metal ions contained in the crushed pulp, so that the whiteness of the base paper of the laminated board is further improved. As for the kind of the chelating agent, there may be mentioned chelating agents which form a soluble complex with a metal ion, such as: one or more of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic dianhydride, and nitrilotriacetic acid. These chelating agents can form soluble complexes with metal ions, thereby increasing the metal ion removal rate in the slurry.
In some embodiments, in order to improve the moisture absorption of the laminated board base paper, the qualified pulp is sent to a pressure screen for screening after passing through a first-stage three-section purification system for good pulp countercurrent, white water tower dilution and fan pump fan pulp, and before obtaining the upper wire pulp, the production process of the laminated board base paper further comprises the following steps:
adding a wet strength agent into the qualified slurry, and then mixing the qualified slurry to ensure that the slurry concentration of the qualified slurry is 2.5-3.0%; 9 g-15 g of wet strength agent is added into every 100g of qualified slurry, so that the moisture absorption of the base paper of the produced laminated board meets the requirement. As for the kind of the wet strength agent, polyamide polyamine epichlorohydrin resin and/or modified melamine resin may be mentioned, but not limited thereto.
Forming the wet paper by using the qualified slurry to obtain a wet paper web; carrying out post-treatment on the wet paper web to obtain base paper, wherein the base paper comprises:
wet paper forming is carried out on the upper wire part of the upper wire box to obtain wet paper; carrying out post-treatment on the wet paper web to obtain base paper; the post-treatment of the wet paper web is essentially the process of pressing and drying the wet paper web. The moisture content of the base paper can be set according to actual conditions. For example: the water content of the base paper is 5% -30%.
In some embodiments, before the base paper is immersed in the flame retardant impregnation solution for impregnation treatment, the process for producing the base paper of the laminated board further comprises:
and preparing a flame retardant impregnation liquid by using a flame retardant. For example: the flame retardant was dispersed in water to obtain an aqueous flame retardant solution used as a flame retardant impregnation solution. The mass fraction of the flame retardant contained in the flame retardant aqueous solution (or the flame retardant impregnation solution) is 10-15%. The flame retardant can be one or more of condensed guanidine phosphate, magnesium hydroxide and aluminum hydroxide. However, in order to ensure that the flame retardant can be fully distributed on the surface of the base paper, the flame retardant is condensed guanidine phosphate, and the flame retardant is dissolved in water at room temperature or normal temperature.
The time of the immersion treatment may be set according to the actual situation, for example: when the dipping solution is a flame retardant aqueous solution, the dipping time is 10-120 s.
It should be understood that in the prior art, the traditional flame retardant treatment for manufacturing copper clad laminate is mainly halogenated and phosphorus-containing method, but halogenated or phosphorus-containing epoxy resin material will release toxic or even carcinogenic substances during burning and waste treatment, phosphorus flame retardant has possibility of polluting and protecting electronic components during use, which can reduce moisture resistance and processability of epoxy plastic package material, and red phosphorus flame retardant will generate red phosphorus decomposition gas during molding, which has adverse effect on ecological environment and human environment after use and waste. In the production process of the laminated board base paper provided by the embodiment of the invention, the flame retardant can be preferably guanidine salt flame retardant such as condensed guanidine phosphate, and is an organic inorganic acid salt flame retardant. The guanidine phosphate flame retardant has a good flame retardant effect on paper, and the base paper is subjected to flame retardant treatment by using the guanidine phosphate flame retardant, so that the flame retardant has good flame retardant performance, the limit oxygen index of the base paper can reach more than 30.6%, the influence on other performances of the impregnated insulating paper is small, the base paper is environment-friendly and non-toxic, and the base paper meets the national standard.
Example two
The embodiment of the invention also provides the laminated plate base paper, which is produced by adopting the production process of the laminated plate base paper: quantification of the base paper of the laminate: 135 +/-3 g/square meter, 0.270mm +/-0.020 mm in thickness, whiteness not less than 88, transverse wet strength not less than 0.50 kgf/15 mm, longitudinal wet strength not less than 0.60 kgf/15 mm, transverse liquid absorption height 85mm +/-10 mm/10min, longitudinal liquid absorption height 90mm +/-10 mm/10min, limit oxygen index not less than 30%, flame continuing performance V-0 grade, heat resisting time at 130 ℃ of 30min, tracking resistance not less than 800V, no foaming and no layering.
EXAMPLE III
As shown in fig. 2, a production process of a laminated board base paper provided by an embodiment of the present invention includes the following steps:
firstly, carrying out pulping on 100% pure bleached sulfate eucalyptus pulp (imported from Brazil) through a hydrapulper to obtain a pulping slurry, conveying the pulping slurry to a No. 1 pulp storage tank by using a pump, carrying out free pulping in a mode of connecting a fluffer and a disc mill in series, adding ethylene diamine tetraacetic acid into the pulping slurry, adjusting the opening of pulp inlet and outlet valves of the disc mill by using the obtained qualified pulp, controlling the beating degree of the obtained qualified pulp to be within 21 DEG SR, and controlling the wet weight of fibers to be 1.3 g; the ash content of 100% pure bleached sulfate eucalyptus pulp is less than 1%, and the 100% pure bleached sulfate eucalyptus pulp contains 15% pentosan; the dosage of the ethylene diamine tetraacetic acid is 2kg/t of oven-dried pulp.
Secondly, conveying the qualified slurry to a No. 2 slurry storage tank, then conveying the qualified slurry to a No. 3 slurry storage tank, adding modified melamine formaldehyde resin into the modified melamine formaldehyde resin, and then conveying the qualified slurry to a slurry mixing box through the No. 4 slurry storage tank for continuous slurry mixing to enable the slurry concentration of the qualified slurry to be 2.5%; 13g of modified melamine formaldehyde resin was added per 100g of acceptable size. Passing the qualified pulp through a first-stage three-section purification system for good pulp countercurrent, diluting the qualified pulp by a white water tower and flushing the qualified pulp by a flushing pump, and then sending the qualified pulp to a pressure screen for screening to obtain screened pulp; wet paper forming is carried out on the upper wire part of the net head box by the upper wire pulp through a pulp stabilizing box and a pulp flowing box to obtain a wet paper web; and squeezing and drying the wet paper web to obtain base paper, wherein the water content of the base paper is 10%.
Fourthly, dissolving the condensed guanidine phosphate in water at normal temperature to obtain a flame retardant aqueous solution with the mass fraction of 11%, and taking the flame retardant aqueous solution as an impregnation solution; and (3) dipping the base paper in the dipping solution for 50s, and then extruding, squeezing and drying to obtain the base paper of the laminated board. The base paper of the laminated board can be used as an insulating layer material for a circuit board.
Example four
As shown in fig. 2, a production process of a laminated board base paper provided by an embodiment of the present invention includes the following steps:
firstly, carrying out pulping on 100% pure bleached sulfate eucalyptus pulp (imported from Brazil) through a hydrapulper to obtain a pulping slurry, conveying the pulping slurry to a No. 1 pulp storage tank by using a pump, carrying out free pulping in a mode of connecting a fluffer and a disc mill in series, adding ethylene diamine tetraacetic acid into the pulping slurry, adjusting the opening of pulp inlet and outlet valves of the disc mill by using the obtained qualified pulp, controlling the beating degree of the obtained qualified pulp to be within 22 DEG SR, and controlling the wet weight of fibers to be 1.2 g; the ash content of 100% pure bleached sulfate eucalyptus pulp is less than 1%, and the 100% pure bleached sulfate eucalyptus pulp contains 18% pentosan; the dosage of the ethylene diamine tetraacetic acid is 2kg/t of oven-dried pulp.
Secondly, conveying the qualified slurry to a No. 2 slurry storage tank, then conveying the qualified slurry to a No. 3 slurry storage tank, adding modified melamine formaldehyde resin into the modified melamine formaldehyde resin, and then conveying the qualified slurry to a slurry mixing box through the No. 4 slurry storage tank for continuous slurry mixing to enable the slurry concentration of the qualified slurry to be 2.5%; 13g of modified melamine formaldehyde resin was added per 100g of acceptable size.
Thirdly, wet paper forming is carried out on the upper wire part of the upper wire pulp in the front wire box to obtain a wet paper web; and squeezing and drying the wet paper web to obtain base paper, wherein the water content of the base paper is 10%.
Fourthly, dissolving the condensed guanidine phosphate in water at normal temperature to obtain a flame retardant aqueous solution with the mass fraction of 11%, and taking the flame retardant aqueous solution as an impregnation solution; and (3) dipping the base paper in the dipping solution for 50s, and then extruding, squeezing and drying to obtain the base paper of the laminated board. The base paper of the laminated board can be used as an insulating layer material for a circuit board.
EXAMPLE five
As shown in fig. 2, a production process of a laminated board base paper provided by an embodiment of the present invention includes the following steps:
firstly, pulping 100% pure bleached sulfate eucalyptus (Brazilian inlet) pulp by a hydrapulper to obtain a pulped pulp, conveying the pulped pulp to a No. 1 pulp storage tank by a pump, performing free pulping by a mode of connecting a fluffer and a disc mill in series, adding diethylenetriaminepentaacetic dianhydride into the pulped pulp, adjusting the opening degree of pulp inlet and outlet valves of the disc mill for the obtained qualified pulp, controlling the beating degree of the obtained qualified pulp to be 23 degrees SR, and controlling the wet weight of fibers to be 1.0 g; the ash content of 100% pure bleached sulfate eucalyptus pulp is less than 3%, and the 100% pure bleached sulfate eucalyptus pulp contains 14% pentosan; the amount of diethylenetriaminepentaacetic dianhydride used was 3kg/t of oven dried slurry.
Secondly, conveying the qualified slurry to a No. 2 slurry storage tank, then conveying the qualified slurry to a No. 3 slurry storage tank, adding polyamide polyamine epichlorohydrin resin into the slurry storage tank, conveying the qualified slurry to a slurry mixing box through the No. 4 slurry storage tank, and continuously mixing the qualified slurry to make the slurry concentration of the qualified slurry be 3%; 9g of polyamide polyamine epichlorohydrin resin was added per 100g of the accepted slurry.
Thirdly, wet paper forming is carried out on the upper wire part of the upper wire pulp in the front wire box to obtain a wet paper web; and squeezing and drying the wet paper web to obtain base paper, wherein the water content of the base paper is 5%.
Fourthly, dissolving magnesium hydroxide in water to obtain a flame retardant aqueous solution with the mass fraction of 30%, and taking the flame retardant aqueous solution as a steeping liquor; and (3) dipping the base paper in the dipping solution for 10s, and then extruding, squeezing and drying to obtain the base paper of the laminated board. The base paper of the laminated board can be used as an insulating layer material for a circuit board.
EXAMPLE six
As shown in fig. 2, a production process of a laminated board base paper provided by an embodiment of the present invention includes the following steps:
firstly, pulping 100% pure bleached sulfate eucalyptus (Brazilian inlet) pulp by a hydrapulper to obtain a pulped pulp, conveying the pulped pulp to a No. 1 pulp storage tank by using a pump, performing free pulping in a mode of connecting a fluffer and a disc mill in series, adding nitrilotriacetic acid and ethylenediamine tetraacetic acid into the pulped pulp, adjusting the opening of pulp inlet and outlet valves of the disc mill by the obtained qualified pulp, controlling the beating degree of the obtained qualified pulp to be within 20 DEG SR, and controlling the wet weight of fibers to be 1.1 g; the ash content of 100% pure bleached sulfate eucalyptus pulp is less than 3%, and the 100% pure bleached sulfate eucalyptus pulp contains 30% pentosan; the dosage of the nitrilotriacetic acid is 0.5kg/t of oven dry pulp, and the dosage of the ethylene diamine tetraacetic acid is 1.5kg/t of oven dry pulp.
Secondly, conveying the qualified slurry to a No. 2 slurry storage tank, then conveying the qualified slurry to a No. 3 slurry storage tank, adding polyamide polyamine epichlorohydrin resin into the slurry storage tank, conveying the qualified slurry to a slurry mixing box through the No. 4 slurry storage tank, and continuously mixing the qualified slurry to make the slurry concentration of the qualified slurry be 2.8%; for every 100g of acceptable size, 10g of polyamide polyamine epichlorohydrin resin and 5g of modified melamine resin were added.
Thirdly, wet paper forming is carried out on the upper wire part of the upper wire pulp in the front wire box to obtain a wet paper web; and squeezing and drying the wet paper web to obtain base paper, wherein the water content of the base paper is 30%.
Fourthly, dissolving aluminum hydroxide and magnesium hydroxide in water to obtain a flame retardant aqueous solution with the mass fraction of 10% (the mass fraction of the aluminum hydroxide is 2%, the mass fraction of the magnesium hydroxide is 8%), and taking the flame retardant aqueous solution as a steeping liquor; and (3) dipping the base paper in the dipping solution for 120s, and then extruding, squeezing and drying to obtain the base paper of the laminated board. The base paper of the laminated board can be used as an insulating layer material for a circuit board.
In order to verify the performance of the base paper of the laminated plate produced by the production process of the base paper of the laminated plate, the base paper of the laminated plate provided by the embodiment of the invention is subjected to performance evaluation. Fig. 1 shows a table for evaluating the properties of the base paper of the laminate prepared in the example of the present invention.
Table 1 table for evaluating the properties of base paper of laminated board prepared in the examples of the present invention
As can be seen from table 1: the production process of the base paper of the laminated plate provided by the embodiment of the invention has the following steps: 135 +/-3 g/square meter, the thickness is 0.270 +/-0.020 mm, the whiteness is more than or equal to 88 percent, the transverse wet strength is more than or equal to 0.50 kgf/15 mm, the longitudinal wet strength is more than or equal to 0.60 kgf/15 mm, the transverse liquid absorption height is 85mm +/-10 mm/10min, the longitudinal liquid absorption height is 90mm +/-10 mm/10min, the limiting oxygen index is more than or equal to 30 percent, the flame retardance is V-0 grade, the heat-resisting time at 130 ℃ is 30min, and the tracking resistance index is more than or equal to 800V. And through visual observation, the base paper of the laminated plate produced by the production process of the base paper of the laminated plate provided by the embodiment of the invention has no bubbles and delamination. Therefore, the laminated plate base paper produced by the production process of the laminated plate base paper provided by the embodiment of the invention has uniform thickness and good water absorption; the laminated board base paper produced by the production process of the laminated board base paper provided by the embodiment of the invention has good insulation and appearance quality, and the copper-clad plate formed by the laminated board base paper has good dimensional stability, heat resistance and dip soldering resistance.
Claims (7)
1. A production process of laminated board base paper is characterized by comprising the following steps:
firstly, utilizing a hydrapulper to carry out pulping on 100% bleached wood pulp to obtain pulping pulp; adding a chelating agent into the crushed pulp, and performing free pulping on the crushed pulp by using a mode of connecting a fluffer and a disc grinder in series to obtain qualified pulp; the 100% bleached wood pulp contains 14% -30% of pentosan; the dosage of the chelating agent is 1kg/t-3kg/t of oven dry pulp, and the chelating agent is one or more of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic dianhydride and nitrilotriacetic acid;
secondly, passing the qualified pulp through a first-stage three-section purification system for good pulp countercurrent, diluting the qualified pulp by a white water tower and flushing the qualified pulp by a flushing pump, and then sending the qualified pulp to a pressure screen for screening to obtain screened pulp; forming wet paper by using the qualified slurry to obtain a wet paper web; carrying out post-treatment on the wet paper web to obtain base paper;
thirdly, soaking the base paper into a flame retardant soaking solution for soaking treatment, and then performing post-treatment to obtain base paper of the laminated board; the flame retardant dipping solution contains 10-15% of a flame retardant by mass; the flame retardant contained in the flame retardant dipping solution is condensed guanidine phosphate; quantification of the base paper of the laminate: 135 +/-3 g/square meter, the thickness is 0.270 +/-0.020 mm, the whiteness is more than or equal to 88 percent, the transverse wet strength is more than or equal to 0.50 kgf/15 mm, the longitudinal wet strength is more than or equal to 0.60 kgf/15 mm, the transverse liquid absorption height is 85mm +/-10 mm/10min, the longitudinal liquid absorption height is 90mm +/-10 mm/10min, the limiting oxygen index is more than or equal to 30 percent, the flame resistance is V-0 grade, the heat-resisting time at 130 ℃ is 30min, the tracking resistance index is more than or equal to 800V, and no foaming or layering exists.
2. The production process according to claim 1, characterized in that: the 100% bleached wood pulp is wood pulp made from hardwood pulp, and the ash content of the bleached wood pulp is less than 3%.
3. The production process according to claim 1, characterized in that: the beating degree of the qualified slurry is controlled to be between 20 DEG SR and 23 DEG SR, and the wet weight of the fiber is 1.0g to 1.3 g.
4. The production process according to claim 1, characterized in that: the production process comprises the following steps of passing qualified pulp through a first-stage three-section purification system for countercurrent fine pulp, diluting the qualified pulp by a white water tower and flushing the qualified pulp by a flushing pump, and then sending the qualified pulp to a pressure screen for screening, wherein before the screened pulp is obtained, the production process also comprises the following steps:
adding a wet strength agent into qualified slurry, and then mixing the qualified slurry to ensure that the slurry concentration of the qualified slurry is 2.5-3.0%; 9-15 g of wet strength agent is added into every 100g of qualified slurry.
5. The production process according to claim 4, characterized in that: the wet strength agent is polyamide polyamine epichlorohydrin resin and/or modified melamine resin.
6. The production process according to claim 1, characterized in that: before the base paper is immersed in the flame retardant impregnation liquid for impregnation treatment, the production process further comprises the following steps:
and preparing a flame retardant impregnation liquid by using a flame retardant.
7. The production process according to any one of claims 1 to 6, characterized in that the moisture content of the base paper is 5% to 30%; the time of the dipping treatment is 10 s-120 s.
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| CN111501411B (en) * | 2020-04-22 | 2021-07-30 | 宁波思特雷斯金属防护材料有限公司 | Production process of sulfur-free circuit board isolation paper |
| CN113605145B (en) * | 2021-08-04 | 2022-10-11 | 建滔（佛冈）绝缘材料有限公司 | Cable oil-based paper, preparation method thereof and drilling base plate of printed circuit board |
| CN117211105A (en) * | 2023-10-25 | 2023-12-12 | 建滔（佛冈）绝缘材料有限公司 | Heat-resistant flexible laminated board base paper and preparation method thereof |
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