CN112709096A - High-tensile-strength insulating crepe paper and processing technology thereof - Google Patents
High-tensile-strength insulating crepe paper and processing technology thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/303—Double disc mills
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
Abstract
The invention relates to the technical field of papermaking, and aims to provide insulating crepe paper with high tensile strength and a processing technology thereof, wherein the technical scheme is as follows: the composition is prepared from the following raw materials in parts by weight: polysulfone amide pulp, aramid fiber, wherein the aramid fiber comprises aramid long fibers and aramid short fibers; adding long aramid fibers and short aramid fibers into a hydrapulper, pulping with water, pulping with double millstones to form pulp, mixing polysulfonamide pulp, aramid pulp and aramid fiber pulp together to form pulp, preparing to form fiber paper, and finally performing wrinkling treatment on the fiber paper to obtain the insulating crepe paper. The invention has the advantages of stable processing technology, good controllability, and being beneficial to large-scale production, and the prepared insulating crepe paper has high tensile strength and good insulativity.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to high-tensile-strength insulating crepe paper and a processing technology thereof.
Background
One of the electric insulating papers used for insulating crepe paper has been widely used as an insulating paper in the electric appliance and power industry because of its excellent heat resistance, flame resistance, electric insulating property, and high chemical stability. With the rapid development of the electrical appliance and power industry, the performance requirements for the electrical insulation paper are higher and higher, and especially the demands for the ultra-thin, high-insulation and high-tensile strength electrical insulation paper are increasing day by day.
Chinese patent application publication No. CN107435278A discloses an insulating pulp sheet and a processing process thereof, comprising the steps of:
s1, preparing materials: selecting Chinese alpine rush as raw material, screening the raw material, removing weeds and impurities, and cutting the raw material by a chopper;
s2, at 25m3Steaming in a rotary spherical digester: using 30% NaOH alkali liquor, wherein the straw consumption and liquor ratio of 16-18% of absolute dry straw is 3.2-3.5: under the condition of 1, putting water, alkali and Chinese alpine rush into a rotary spherical digester, idling for 30min without adding steam, uniformly heating to 150 ℃, and keeping the temperature for 1-2.5 h; then, increasing the pressure to 0.5-0.65 Mpa, heating to 160-165 ℃, and then preserving the heat for 6-7 hours; the hardness of the coarse pulp after steaming reaches: KMnO4The value is about 9, the residual alkali is 8-12 g/l, and the average fiber length is 1.7-2 mm; then the mixture enters a 80m3 spraying bin and then passes through 3-6 m2Washing after screening by using an inclined screen and a 2SK-2 type jumping screen;
s3, washing: ZNC-2 type 4.5m2The side pressure concentrators are connected with 2 sets of side pressure concentrators in series, the initial washing temperature is 50-100 ℃, the washing water hardness is 200-ion-water 300ppm, the pulp layer thickness is 3-62 mm, the washing water is washed under the condition of increasing pressure difference properly, then the washing water enters a second side pressure concentrator, the temperature is 80-120 ℃, the washing water hardness is 200-300ppm, the pulp layer thickness is 3-6 mm, the second washing is carried out under the condition of increasing pressure difference properly, and the equipment washing capacity is guaranteed to reach 20-30 m2After washing, the PH value is neutral;
s4, purifying the slurry: washed pulp sheets were fed in sequence at 1.6m2ZSL centrifugal screen and 606 type two-stage sand removing systemPerforming multi-stage and multi-stage purification to remove fine dust and sand in the slurry, and passing through 8m2The ZNW-3 type cylinder thickener reaches a paper making pulp storage tank, and then enters a paper machine pulp making process through a 600 type desanding system;
s5, manufacturing a pulp board by using paper: manufacturing a pulp board by using a pulp board manufacturing machine;
s6, slitting and packaging: and (5) cutting, metering, packaging and warehousing by a splitting machine. The quality of the warehousing product reaches the following standard: the average number of iron particles per 1800cm2 is less than or equal to 100, the average number of fiber iron is less than or equal to 100, the number of copper particles is 0, and the hardness value KMnO4The value is more than or equal to 12, and the amount of impurities is less than or equal to 30000mm2/kg。
Although the prior art scheme selects the Chinese alpine rush which has long, thin and uniform fibers and good flexibility as the papermaking raw material, in the actual processing process, the raw material is not further strengthened because the insulating paper pulp only selects a Chinese alpine rush natural raw material and is steamed and boiled by simple alkali soaking, and the insulating paper pulp has single component, so that the prepared insulating paper hardly meets the requirement of high tensile strength of the insulating paper; on the other hand, the selection of a single chinese alpine rush as the pulp raw material is limited by the supply of the raw material, which is not suitable for mass production. Therefore, the development of the insulating paper which has stable production process, high tensile strength and easy mass production and the processing process thereof have great significance.
SUMMARY OF THE PATENT FOR INVENTION
The first purpose of the invention is to provide the high-tensile-strength insulating crepe paper which has the advantages of high tensile strength and good insulating property.
The technical purpose of the invention is realized by the following technical scheme:
the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 60-130 parts of polysulfone amide paper pulp, 30-80 parts of aromatic polyamide paper pulp and 8-25 parts of aromatic polyamide fiber, wherein the SR value of the polysulfone amide paper pulp is 60-80, and the SR value of the aromatic polyamide paper pulp is 45-90.
By adopting the technical scheme, the polysulfone amide paper pulp mainly comprises polysulfone amide fibers, and the polysulfone amide fibers are aromatic polyamide fibers containing sulfone groups on a high-molecular main chain, have excellent heat-resistant flame-retardant property, electric insulation property, corrosion resistance, radiation resistance and size stability, and are important pulp for manufacturing high-performance insulating paper; the aramid pulp mainly comprises aramid fibers, and the aramid fibers have the characteristics of high tensile strength, high modulus, low elongation, high flame resistance and high organic solvent resistance, and can effectively improve the tensile strength and mechanical properties of the insulating paper.
Further, the raw materials comprise the following components in parts by weight: 75-118 parts of polysulfone amide pulp, 40-70 parts of aromatic polyamide pulp and 10-20 parts of aromatic polyamide fiber.
By adopting the technical scheme, the raw material component content of the product is further optimized, so that the effect of improving the product performance and quality is achieved.
Further, the polysulfonamide pulp is polyphenylene sulfone terephthalamide fiber pulp.
By adopting the technical scheme, the strength of the polyphenylene sulfone terephthalamide fiber (PSA) is slightly lower than that of an aramid fiber, but the polyphenylene sulfone terephthalamide fiber has remarkable advantages in flame retardance and thermal-oxidative aging resistance. The polyphenylene sulfone terephthalamide fiber is heated in hot air at 300 ℃ for 100 hours, the strength loss is less than 5 percent, and the limiting oxygen index exceeds 33; the polyphenylene sulfone terephthalamide fiber also has excellent dyeability, electrical insulation, chemical corrosion resistance, radiation resistance and other properties, and the electrical insulation property of the insulation paper can be effectively improved by taking the polyphenylene sulfone terephthalamide fiber as main slurry of the insulation paper; on the other hand, the combination of the polyphenylene sulfone terephthalamide fiber and the aramid fiber can play a synergistic effect, so that the tensile strength of the insulating paper can be greatly improved on the premise of ensuring that the insulating paper has high electrical insulation.
Further, the aramid pulp is PPTA pulp.
By adopting the technical scheme, the PPTA fiber molecular chain has stronger rigidity, and is easy to form an anisotropic texture under the action of solution shearing force. The high-strength heat-resistant glass fiber has high heat resistance, the glass transition temperature is above 300 ℃, the thermal decomposition temperature is as high as 560 ℃, and the strength retention rate is 84% after the glass fiber is placed in air at 180 ℃ for 48 hours. The PPTA fiber also has high tensile strength and initial elastic modulus, the specific strength is 5 times of that of steel, the compression strength and the bending strength are only lower than those of inorganic fibers when the PPTA fiber is used for composite materials, and the PPTA fiber also has stable thermal shrinkage creep property, high insulating property and chemical corrosion resistance, so that the tensile strength of the insulating paper can be effectively improved, and the service life of the insulating paper is prolonged.
Further, the aramid fiber comprises aramid long fibers and aramid short fibers in a mass ratio of 1 (1-3).
By adopting the technical scheme, the aramid long fibers and the aramid short fibers are mixed and compounded to form the interweaving complementation of the long fibers and the short fibers in the slurry, so that a gradient reinforcing reticular structure can be formed, and the tensile strength and the paper fineness of the insulating paper can be improved.
Further, the long aramid fibers are PPTA fibers with the fiber length of 5-8 mm, and the short aramid fibers are PPTA fibers with the fiber length of 1-3 mm.
By adopting the technical scheme, 5-8 mm PPTA long fibers and 1-3 mm PPTA short fibers can be more uniformly dispersed in the slurry, so that the uniformity of paper pulp fibers can be improved, and the tensile strength of the insulating paper is further improved.
Further, the product also comprises 3-10 parts of CMC carboxymethyl cellulose.
By adopting the technical scheme, the CMC is prepared by carboxymethylation of cellulose, and the aqueous solution of the CMC has the effects of thickening, film forming, adhesion, emulsification, suspension and the like, can improve the consistency and the film forming property of fiber pulp, can play a role in uniformly dispersing fibers, and can effectively improve the tensile strength and the tear resistance of the insulating paper.
The second purpose of the invention is to provide a processing technology of the high-tensile-strength insulating crepe paper, which has the advantages of stable processing technology, good controllability and contribution to large-scale production.
The second purpose of the patent of the invention is realized by the following technical scheme, which specifically comprises the following steps: s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2%, and controlling the SR value of the fiber to be 60-75;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at the drying temperature of 60-95 ℃ to obtain fiber paper;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, and performing wrinkling treatment, wherein the wrinkling temperature is 100-125 ℃, the wrinkling pressure is 0.2-0.4 Mpa, and the finished product of the insulating crepe paper is prepared.
By adopting the technical scheme, the aramid long fibers and the aramid short fibers are subjected to hydraulic pulping to form the aramid fiber pulp, so that the effect of improving the dispersion degree of the aramid long fibers and the aramid short fibers is achieved, the fiber uniformity and the paper fineness of the fiber paper are improved, and the stability of the tensile strength of the insulating paper is improved. The insulating paper is subjected to wrinkling treatment through the wrinkling machine, so that the surface of the insulating paper is provided with micro wrinkles, the micro wrinkles can improve the elongation and toughness of the insulating paper, the friction coefficient of the surface of the paper is also increased, and the insulating paper is convenient to wind and roll.
Further, the winding speed of the fiber paper in the step S5 is 30-55 m/min.
By adopting the technical scheme, the fiber paper is a rough finished product of the insulating paper, is not finally shaped, and has weaker paper strength than a finished product, so that the coiling speed is not too high, and the fiber paper is determined according to the paper strength of the fiber paper, thereby reducing the phenomenon of fiber paper breakage caused by too high coiling speed.
Furthermore, the winding speed of the finished insulating crepe paper in the step S6 is 40-85 m/min.
By adopting the technical scheme, the appropriate coiling speed is adjusted, and the probability of paper breakage is reduced as much as possible while the insulating crepe paper is ensured to be coiled quickly.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, the polysulfonamide paper pulp is used as a main paper pulp raw material, the aromatic polyamide paper pulp is used as a compound pulp, the excellent heat-resistant flame-retardant property, the electric insulation property and the corrosion resistance of the polysulfonamide fiber are fully utilized, and the characteristics of high tensile strength, high modulus and low elongation of the aromatic polyamide fiber are combined, so that the insulating paper has the characteristics of high electric insulation property and high tensile strength;
2. the polysulfone amide paper pulp is preferably polyphenylene sulfone-terephthalamide fiber paper pulp, the strength of the polyphenylene sulfone-terephthalamide fiber (PSA) is slightly lower than that of the aromatic polyamide fiber, but the polysulfone amide paper pulp has obvious advantages in the aspects of flame retardance and thermal-oxidative aging resistance, and the electric insulation performance of the insulation paper can be effectively improved by utilizing the excellent dyeability, electric insulation performance, chemical corrosion resistance, radiation resistance and the like of the polyphenylene sulfone-terephthalamide fiber;
3. the aromatic polyamide paper pulp is PPTA paper pulp, the PPTA fiber molecular chain has stronger rigidity, the compression strength and the bending strength are only lower than those of inorganic fibers when the aromatic polyamide paper pulp is used for composite materials, and the aromatic polyamide paper pulp has stable thermal shrinkage creep property, high insulating property and chemical corrosion resistance, so that the tensile strength of the insulating paper can be effectively improved, and the service life of the insulating paper is prolonged.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Examples
Example 1: the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 60 parts of polysulfone amide pulp, 30 parts of aromatic polyamide pulp, 8 parts of aromatic polyamide fiber and 3 parts of CMC (carboxymethyl cellulose), wherein the polysulfone amide pulp is polyphenylsulfone terephthalate fiber pulp with an SR value of 60, and the aromatic polyamide pulp is PPTA pulp with an SR value of 45; the aramid fiber comprises an aramid long fiber and an aramid short fiber in a mass ratio of 1:1, wherein the aramid long fiber is a PPTA fiber with a fiber length of 5-8 mm, and the aramid short fiber is a PPTA fiber with a fiber length of 1-3 mm;
the processing technology of the high-tensile-strength insulating crepe paper comprises the following steps:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, and pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2% of aramid fiber pulp, wherein the SR value of the fiber is controlled to be 60;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at the drying temperature of 60 ℃ to obtain fiber paper, and winding the paper by a winding roll at the winding speed of 40-85 m/min;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, performing wrinkling treatment, wherein the wrinkling temperature is 100 ℃, the wrinkling pressure is 0.2Mpa, preparing finished insulating crepe paper, and rolling the paper through a rolling roller, wherein the rolling speed is 30-75 m/min.
Example 2: the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 75 parts of polysulfone amide pulp, 40 parts of aromatic polyamide pulp, 10 parts of aromatic polyamide fiber and 5.5 parts of CMC (carboxymethyl cellulose), wherein the polysulfone amide pulp is polyphenylsulfone terephthalate fiber pulp with an SR value of 64, and the aromatic polyamide pulp is PPTA pulp with an SR value of 54; the aramid fiber comprises an aramid long fiber and an aramid short fiber in a mass ratio of 1:1.4, wherein the aramid long fiber is a PPTA fiber with the fiber length of 5-8 mm, and the aramid short fiber is a PPTA fiber with the fiber length of 1-3 mm;
the processing technology of the high-tensile-strength insulating crepe paper comprises the following steps:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, and pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2% of aramid fiber pulp, wherein the SR value of the fiber is controlled to be 63;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at the drying temperature of 67 ℃ to obtain fiber paper, and winding the paper by a winding roll at the winding speed of 40-85 m/min;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, performing wrinkling treatment, wherein the wrinkling temperature is 104 ℃, the wrinkling pressure is 0.25Mpa, preparing finished insulating crepe paper, and rolling the paper through a rolling roller, wherein the rolling speed is 30-75 m/min.
Example 3: the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 90 parts of polysulfone amide pulp, 50 parts of aromatic polyamide pulp, 13 parts of aromatic polyamide fiber and 6.5 parts of CMC (carboxymethyl cellulose), wherein the polysulfone amide pulp is polyphenylsulfone terephthalate fiber pulp with an SR value of 68, and the aromatic polyamide pulp is PPTA pulp with an SR value of 63; the aramid fiber comprises an aramid long fiber and an aramid short fiber in a mass ratio of 1:1.8, wherein the aramid long fiber is a PPTA fiber with the fiber length of 5-8 mm, and the aramid short fiber is a PPTA fiber with the fiber length of 1-3 mm;
the processing technology of the high-tensile-strength insulating crepe paper comprises the following steps:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, and pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2% of aramid fiber pulp, wherein the SR value of the fiber is controlled to be 66;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at 74 ℃ to obtain fiber paper, and winding the paper by a winding roll at a winding speed of 40-85 m/min;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, performing wrinkling treatment, wherein the wrinkling temperature is 108 ℃, the wrinkling pressure is 0.3Mpa, preparing finished insulating crepe paper, and rolling the paper through a rolling roller, wherein the rolling speed is 30-75 m/min.
Example 4: the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 105 parts of polysulfone amide pulp, 60 parts of aromatic polyamide pulp, 16 parts of aromatic polyamide fiber and 7.5 parts of CMC (carboxymethyl cellulose), wherein the polysulfone amide pulp is polyphenylsulfone terephthalate fiber pulp with an SR value of 72, and the aromatic polyamide pulp is PPTA pulp with an SR value of 72; the aramid fiber comprises an aramid long fiber and an aramid short fiber in a mass ratio of 1:2.2, wherein the aramid long fiber is a PPTA fiber with the fiber length of 5-8 mm, and the aramid short fiber is a PPTA fiber with the fiber length of 1-3 mm;
the processing technology of the high-tensile-strength insulating crepe paper comprises the following steps:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, and pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2% of aramid fiber pulp, wherein the SR value of the fiber is controlled to be 69;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at the drying temperature of 81 ℃ to obtain fiber paper, and winding the paper by a winding roll at the winding speed of 40-85 m/min;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, performing wrinkling treatment, wherein the wrinkling temperature is 112 ℃, the wrinkling pressure is 0.35Mpa, preparing finished insulating crepe paper, and rolling the paper through a rolling roller, wherein the rolling speed is 30-75 m/min.
Example 5: the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 118 parts of polysulfone amide pulp, 70 parts of aromatic polyamide pulp, 20 parts of aromatic polyamide fiber and 8.5 parts of CMC (carboxymethyl cellulose), wherein the polysulfone amide pulp is polyphenylsulfone terephthalate fiber pulp with the SR value of 76, and the aromatic polyamide pulp is PPTA pulp with the SR value of 81; the aramid fiber comprises an aramid long fiber and an aramid short fiber in a mass ratio of 1:2.6, wherein the aramid long fiber is a PPTA fiber with the fiber length of 5-8 mm, and the aramid short fiber is a PPTA fiber with the fiber length of 1-3 mm;
the processing technology of the high-tensile-strength insulating crepe paper comprises the following steps:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, and pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2% of aramid fiber pulp, wherein the SR value of the fiber is controlled to be 72;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at 88 ℃ to obtain fiber paper, and winding the paper by a winding roll at a winding speed of 40-85 m/min;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, performing wrinkling treatment, wherein the wrinkling temperature is 116 ℃, the wrinkling pressure is 0.4Mpa, preparing finished insulating crepe paper, and rolling the paper through a rolling roller, wherein the rolling speed is 30-75 m/min.
Example 6: the high-tensile-strength insulating crepe paper is prepared from the following raw materials in parts by weight: 130 parts of polysulfone amide pulp, 80 parts of aromatic polyamide pulp, 25 parts of aromatic polyamide fiber and 10 parts of CMC (carboxymethyl cellulose), wherein the polysulfone amide pulp is polyphenylsulfone terephthalamide fiber pulp with an SR value of 80, and the aromatic polyamide pulp is PPTA pulp with an SR value of 90; the aramid fiber comprises an aramid long fiber and an aramid short fiber in a mass ratio of 1:3, wherein the aramid long fiber is a PPTA fiber with a fiber length of 5-8 mm, and the aramid short fiber is a PPTA fiber with a fiber length of 1-3 mm;
the processing technology of the high-tensile-strength insulating crepe paper comprises the following steps:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, and pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2% of aramid fiber pulp, wherein the SR value of the fiber is controlled to be 75;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at the drying temperature of 95 ℃ to obtain fiber paper, and winding the paper by a winding roll at the winding speed of 40-85 m/min;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, performing wrinkling treatment, wherein the wrinkling temperature is 125 ℃, the wrinkling pressure is 0.4Mpa, preparing finished insulating crepe paper, and rolling the paper through a rolling roller, wherein the rolling speed is 30-75 m/min.
Comparative example 1: the difference from example 1 is that no aramid pulp was added;
comparative example 2: the difference from example 1 is that aramid filaments are not added;
comparative example 3: the difference from example 1 is that aramid staple fibers were not added;
comparative example 4: the difference from example 1 is that no CMC carboxymethyl cellulose was added.
Performance detection
Selecting 6 parts of each of the insulating crepe paper samples prepared in the examples 1-6 and the comparative examples 1-4, cutting the samples into the same specification, carrying out the following performance tests, and removing the average value of the test results;
and (3) testing the tensile strength: testing according to a method for measuring the tensile strength of GB/T12914-;
tensile index: testing according to the determination method of ISO 1924-2-2008 paper and paperboard tensile property;
elongation at break: testing according to the determination method of ISO 1924-2-2008 paper and paperboard tensile property;
and (3) testing the dielectric strength: according to ASTM D149-97A (R2004) test standards.
Table 1 shows the results of the performance tests on the above-mentioned insulating crepe paper samples
The test results in table 1 show that the tensile strength, the tensile index and the dielectric strength of the examples 1 to 6 are higher than those of the comparative examples 1 to 3, which shows that the tensile resistance of the insulating paper can be remarkably improved by adding the aramid fiber into the paper pulp, and the electrical insulating property of the insulating paper can be remarkably improved; the elongation at break of examples 1 to 6 is lower than that of comparative examples 1 to 3, which shows that the addition of aramid fibers of rigid molecules to the pulp can reduce the flexibility of the insulating paper, thereby reducing the tensile deformation of the insulating paper; the tensile strength of the comparative example 4 is slightly lower than that of the examples 1-6, which shows that the addition of CMC into the pulp can improve the dispersion uniformity of the fiber in the pulp to a certain extent, thereby being beneficial to improving the stability of the tensile strength of the insulating paper; the dielectric strength of the comparative example 4 is equivalent to that of the examples 1 to 6, and no obvious difference exists, which shows that the addition of the CMC has no obvious influence on the dielectric strength of the insulating paper.
The present embodiment is only for explaining the patent of the present invention, and it is not limited to the patent of the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all are protected by the patent law within the scope of the claims of the present patent.
Claims (10)
1. The high-tensile-strength insulating crepe paper is characterized by being prepared from the following raw materials in parts by weight: 60-130 parts of polysulfone amide paper pulp, 30-80 parts of aromatic polyamide paper pulp and 8-25 parts of aromatic polyamide fiber, wherein the SR value of the polysulfone amide paper pulp is 60-80, and the SR value of the aromatic polyamide paper pulp is 45-90.
2. The high-tensile-strength insulating crepe paper as claimed in claim 1, wherein the raw materials in parts by weight are: 75-118 parts of polysulfone amide pulp, 40-70 parts of aromatic polyamide pulp and 10-20 parts of aromatic polyamide fiber.
3. The high tensile strength insulating crepe paper according to claim 1, wherein: the polysulfone amide paper pulp is polyphenylene sulfone terephthalamide fiber paper pulp.
4. The high tensile strength insulating crepe paper according to claim 1, wherein: the aramid pulp is PPTA pulp.
5. The high tensile strength insulating crepe paper according to claim 1, wherein: the aramid fiber comprises aramid long fibers and aramid short fibers in a mass ratio of 1 (1-3).
6. The high tensile strength insulating crepe paper according to claim 5, wherein: the long aramid fibers are PPTA fibers with the fiber length of 5-8 mm, and the short aramid fibers are PPTA fibers with the fiber length of 1-3 mm.
7. The high tensile strength insulating crepe paper according to claim 1, wherein: the product also comprises 3-10 parts of CMC carboxymethyl cellulose.
8. The processing technology of the high-tensile-strength insulating crepe paper is characterized by comprising the following steps of:
s1, preparing raw materials containing polysulfonamide pulp, aramid long fibers and aramid short fibers according to the proportion;
s2, adding long aramid fibers and short aramid fibers into a hydrapulper according to a ratio, adding water for pulping, pulping by using a double grinding disc until the concentration of the fiber dispersion liquid is 3.5-4.2%, and controlling the SR value of the fiber to be 60-75;
s3, adding aramid fiber pulp, polysulfonamide pulp and aramid pulp into a pulp chest to be mixed to form fiber paper mixed pulp;
s4, sequentially carrying out sand removal, pulp stabilization, pulp flowing and inclined net passing on the fiber paper mixed pulp;
s5, squeezing and drying the fiber paper mixed pulp processed in the step S4 at the drying temperature of 60-95 ℃ to obtain fiber paper;
and S6, conveying the fiber paper prepared in the step S5 into a paper wrinkling machine through a conveying roller, and performing wrinkling treatment, wherein the wrinkling temperature is 100-125 ℃, the wrinkling pressure is 0.2-0.4 Mpa, and the finished product of the insulating crepe paper is prepared.
9. The process of claim 8, wherein the fiber paper is wound at a speed of 40-85 m/min in the step S5.
10. The process of claim 8, wherein the winding speed of the finished crepe insulation paper in the step S6 is 30-75 m/min.
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