CN115652682A - Cotton pulp kraft paper for IC carrier plate and manufacturing method thereof - Google Patents
Cotton pulp kraft paper for IC carrier plate and manufacturing method thereof Download PDFInfo
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- CN115652682A CN115652682A CN202211017713.XA CN202211017713A CN115652682A CN 115652682 A CN115652682 A CN 115652682A CN 202211017713 A CN202211017713 A CN 202211017713A CN 115652682 A CN115652682 A CN 115652682A
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- kraft paper
- pulp
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- slurry
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- 239000002655 kraft paper Substances 0.000 title claims abstract description 65
- 229920000742 Cotton Polymers 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 229920005546 furfural resin Polymers 0.000 claims abstract description 15
- 229920005610 lignin Polymers 0.000 claims abstract description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910021389 graphene Inorganic materials 0.000 claims description 17
- 238000004537 pulping Methods 0.000 claims description 17
- 238000004061 bleaching Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 13
- 239000012286 potassium permanganate Substances 0.000 claims description 9
- 238000003490 calendering Methods 0.000 claims description 8
- 238000010411 cooking Methods 0.000 claims description 8
- 235000010265 sodium sulphite Nutrition 0.000 claims description 8
- 238000010009 beating Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000123 paper Substances 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000004043 dyeing Methods 0.000 claims description 2
- 239000001048 orange dye Substances 0.000 claims 1
- 239000012744 reinforcing agent Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000741 silica gel Substances 0.000 description 6
- 229910002027 silica gel Inorganic materials 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 125000003172 aldehyde group Chemical group 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- AJDUTMFFZHIJEM-UHFFFAOYSA-N n-(9,10-dioxoanthracen-1-yl)-4-[4-[[4-[4-[(9,10-dioxoanthracen-1-yl)carbamoyl]phenyl]phenyl]diazenyl]phenyl]benzamide Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=CC=C2NC(=O)C(C=C1)=CC=C1C(C=C1)=CC=C1N=NC(C=C1)=CC=C1C(C=C1)=CC=C1C(=O)NC1=CC=CC2=C1C(=O)C1=CC=CC=C1C2=O AJDUTMFFZHIJEM-UHFFFAOYSA-N 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001043 yellow dye Substances 0.000 description 1
Classifications
-
- 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
- Paper (AREA)
Abstract
The invention discloses a cotton pulp kraft paper for an IC carrier plate and a manufacturing method thereof. The kraft paper prepared by the method has good heat conduction uniformity and improved mechanical properties of the kraft paper layer as a buffer layer, and the lignin furfural resin is added into the slurry as a reinforcing agent, so that the mechanical properties of the kraft paper can be effectively improved, the thickness uniformity of the kraft paper layer in the pressing process can be controlled, and the kraft paper can be recycled for multiple times.
Description
Technical Field
The invention relates to an integrated circuit board, in particular to cotton pulp kraft paper for an IC carrier plate and a manufacturing method thereof.
Background
Integrated circuit boards (integrated circuit boards) are widely used in the electronic industry, and kraft paper and silica gel are usually used as buffer layers to achieve heat transfer buffering when multi-layer boards or substrate boards are laminated. In the PCB manufacturing process, the layers are bonded together at high temperature and high pressure by using a semi-cured sheet to form a multi-layer PCB product. The laminated composite board is formed by laminating and pressing layers such as a carrier board, a buffer layer, a steel plate, copper foil, a core board layer and a prepreg. The thickness of the silica gel is thicker, and the pressing stroke of the press is fixed, so the total thickness of the circuit board is increased due to the adoption of the silica gel, the number of superposed layers is correspondingly reduced, and the production energy is reduced; the deformation of the silica gel in the pressing process is large, which is not beneficial to ensuring the precision; silica gel is usually replaced after being used for multiple times due to high cost, and the physicochemical properties of the silica gel change along with the increase of the use times, so that the difference among products in different batches is indirectly caused, and the product quality is difficult to control. Therefore, kraft paper is often used as the material of the cushioning layer in the prior art.
However, there are many factors affecting the PCB product, wherein the stitching process is also a major aspect; in the laminating process, the most important property of the kraft paper as the buffer layer is to uniformly press and heat the substrate, so the thermal conductivity coefficient of the kraft paper is also important, and how to reach the temperature of the hot plate in a short time and uniformly transfer the heat to the copper foil and each layer, the kraft paper with a suitable thermal conductivity coefficient is required. In addition, the process of pressfitting has very big pressure, and the buffer layer can take place to warp, reduce at the in-process of pressfitting, and the thickness of kraft paper after pressure is taken away has certain increase, leads to the thickness uniformity variation of buffer layer easily.
Disclosure of Invention
In view of the defects and shortcomings of the prior art, the invention provides the cotton pulp kraft paper for the IC carrier plate and the manufacturing method thereof, the kraft paper prepared by the invention has good heat conduction uniformity and mechanical properties as a buffer layer, and the temperature difference of each layer of plate can be reduced in the pressing process; the thickness uniformity of the buffer layer is effectively controlled, the buffer layer can be recycled for multiple times, and the manufacturing cost is reduced.
In order to solve the technical problem of the invention, the method is realized by the following technical scheme:
a method for manufacturing cotton pulp kraft paper for an IC carrier plate comprises the following steps:
(1) Preparing cotton pulp: putting 70-80wt.% cotton linter and 20-30wt.% log raw material into a cooking device, adding sodium hydroxide and sodium sulfite, heating to 150-200 deg.C, controlling steam pressure at 0.3-1.2MPa, and continuously cooking for 3-6 hr;
(2) Bleaching: bleaching the cooked raw material by adopting potassium permanganate and sulfuric acid solution, wherein the pH value of the solution is controlled to be 1.5-2.1, the bleaching time is controlled to be 20-40min, and the bleaching temperature is 25-30 ℃;
(3) Defibering: putting the bleached pulp into a single disc mill for defibering;
(4) Pulping: pulping the defibered pulp by a plurality of conical refiners connected in series, pulping by a plurality of double disc mill pulping machines connected in series, and then washing and purifying;
(5) Adjusting slurry: adding micron graphene powder and lignin furfural resin into the slurry, and stirring to form uniform slurry;
(6) Manufacturing paper: and feeding the slurry into a fourdrinier papermaking machine, and performing sizing, drying, squeezing and calendaring to obtain the formed kraft paper.
Further, as the concentration of the alkali liquor increases, the average degree of polymerization of the pulp decreases very slowly after the cotton linters are cooked. When the concentration of the alkali liquor reaches too high, the average polymerization degree is reduced more rapidly. Therefore, it is preferable that the sodium hydroxide is used in an amount of 1.2 to 1.8% by weight and the sodium sulfite is used in an amount of 2.5 to 3.0% by weight based on the total weight of the raw materials in the step (1).
Furthermore, the concentration of potassium permanganate in the step (2) is 0.15-0.3g/L, and the concentration of sulfuric acid is 1.5-3g/L. The application applies the potassium permanganate and sulfuric acid mixed solution to bleach the pulp, can effectively obtain the high-quality cotton pulp, has high whiteness and low carboxyl and aldehyde group content of the cotton pulp, and is beneficial to the improvement of the performance of the subsequent kraft paper.
Further, the fluffing degree in the step (3) is controlled to be 3.5-4.5%.
Further, the beating concentration in the step (4) is controlled to be 3-5%, and the beating degree is controlled to be 10-20 DEG SR.
Further, in the step (5), the amount of the graphene is 3-8% of the weight of the slurry, and the amount of the lignin furfural resin is 5-10% of the weight of the slurry.
Further, the pressure of the pressing procedure in the step (6) is 0.10-0.2MPa, and the line pressure of the calendaring procedure is 150-180kNn/m.
Further, a dyeing procedure is also included between the steps (4) and (5), and 0.01-0.05% of basic orange yellow dye is added into the slurry.
The invention also provides the cotton pulp kraft paper prepared by the preparation method, and the kraft paper is used as a buffer layer of the IC carrier plate.
The principle of the invention is as follows: according to the technical scheme, the kraft paper slurry is subjected to component adjustment, on one hand, the high-heat-conductivity micron graphene powder is added, the graphene has excellent heat conduction uniformity, the powder is dispersed in the kraft paper, the laminating temperature can be reached within a short time, and the heat can be uniformly transferred to each laminated layer; in order to improve the mechanical property of the kraft paper layer, lignin furfural resin is added into the slurry as a reinforcing agent, so that the mechanical property of the kraft paper can be effectively improved, the thickness uniformity of the kraft paper layer in the pressing process can be controlled, and the kraft paper layer can be recycled for multiple times.
Equivalent to the prior art, the invention at least has the following beneficial effects:
(1) This application adopts cotton linter, log as the kraft paper raw materials, and raw materials sources is extensive, preparation cost is lower, and the kraft paper of preparation not only can satisfy the use of daily use, can be applied to integrated circuit board's buffer layer moreover, effectual assurance integrated circuit board's quality and qualification rate.
(2) According to the invention, the micron graphene powder is added into the slurry, so that the heat conduction uniformity of the kraft paper can be improved, the temperature uniformity among layers is good, and the pressing is effectively ensured.
(3) According to the invention, the lignin furfural resin is added into the slurry, so that the mechanical property of kraft paper can be effectively improved, the thickness uniformity of the kraft paper layer in the pressing process can be controlled, and the kraft paper can be recycled for multiple times.
Detailed Description
The conception, the specific structure and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments, so that the purposes, the schemes and the effects of the present invention can be fully understood. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1
A method for manufacturing cotton pulp kraft paper for an FPC pressing plate comprises the following steps:
(1) Preparing cotton pulp: putting 70wt.% of cotton linters and 30wt.% of raw wood raw materials into a cooking device, adding sodium hydroxide and sodium sulfite, heating to 150 ℃, controlling the steam pressure to be 0.3MPa, and continuously cooking for 6h; wherein the dosage of the sodium hydroxide is 1.8 percent of the total weight of the raw materials, and the dosage of the sodium sulfite is 2.5 percent of the total weight of the raw materials.
(2) Bleaching: bleaching the cooked raw material by adopting potassium permanganate and sulfuric acid solution, wherein the pH value of the solution is controlled to be 1.5, the bleaching time is controlled to be 20min, and the bleaching temperature is 25 ℃; wherein the concentration of potassium permanganate is 0.15g/L and the concentration of sulfuric acid is 3g/L.
(3) Fluffing: putting the bleached pulp into a single disc mill for defibering; wherein the fluffiness degree is controlled at 3.5%.
(4) Pulping: pulping the defibered pulp by a plurality of conical refiners connected in series, pulping by a plurality of double disc mill pulping machines connected in series, and then washing and purifying; wherein the beating concentration is controlled at 3 percent, and the beating degree is controlled at 10 DEG SR.
(5) Adjusting slurry: adding micron graphene powder and lignin furfural resin into the slurry, and stirring to form uniform slurry; wherein the dosage of the graphene is 3% of the weight of the slurry, and the dosage of the lignin furfural resin is 5% of the weight of the slurry.
(6) Manufacturing paper: feeding the slurry into a fourdrinier papermaking machine, and performing sizing, drying, squeezing and calendaring processes to obtain formed kraft paper; wherein the pressure of the pressing process is 0.10MPa, and the line pressure of the calendering process is 150kNn/m.
The prepared kraft paper is cut to be used as a buffer layer, and the carrier plate, the buffer layer, a steel plate, copper foil, a core plate layer, a semi-cured sheet and other layers are laminated and pressed to form the IC carrier plate.
Example 2
A method for manufacturing cotton pulp kraft paper for an FPC pressing plate comprises the following steps:
(1) Preparing cotton pulp: putting 80wt.% of cotton linters and 20wt.% of raw wood raw materials into a cooking device, adding sodium hydroxide and sodium sulfite, heating to 200 ℃, controlling the steam pressure to be 1.2MPa, and continuously cooking for 6h; wherein the dosage of the sodium hydroxide is 1.8 percent of the total weight of the raw materials, and the dosage of the sodium sulfite is 3.0 percent of the total weight of the raw materials.
(2) Bleaching: bleaching the cooked raw material by adopting potassium permanganate and sulfuric acid solution, wherein the pH value of the solution is controlled to be 2.1, the bleaching time is controlled to be 30min, and the bleaching temperature is 30 ℃; wherein the concentration of potassium permanganate is 0.3g/L and the concentration of sulfuric acid is 3g/L.
(3) Fluffing: putting the bleached pulp into a single disc mill for defibering; wherein the fluffiness degree is controlled at 4.5%.
(4) Pulping: pulping the defibered pulp by a plurality of conical refiners connected in series, pulping by a plurality of double disc mill pulping machines connected in series, and then washing and purifying; wherein the beating concentration is controlled at 5 percent, and the beating degree is controlled at 20 DEG SR.
(5) Adjusting slurry: adding micron graphene powder and lignin furfural resin into the slurry, and stirring to form uniform slurry; wherein the dosage of the graphene is 8 percent of the weight of the slurry, and the dosage of the lignin furfural resin is 10 percent of the weight of the slurry.
(6) Manufacturing paper: feeding the slurry into a fourdrinier papermaking machine, and performing sizing, drying, squeezing and calendaring processes to obtain formed kraft paper; wherein the pressure of the pressing process is 0.2MPa, and the line pressure of the calendering process is 180kNn/m.
The prepared kraft paper is cut to be used as a buffer layer, and the carrier plate, the buffer layer, a steel plate, copper foil, a core plate layer, a semi-cured sheet and other layers are laminated and pressed to form the IC carrier plate.
For better comparison, the applicant made a control test on the technical solution.
Comparative example 1
Comparative example 1 is the same as example 1 except that no graphene powder was added and no ligno-furfural resin was added in step (5).
Comparative example 2
Comparative example 2 is the same as example 1 except that only graphene powder is added in step (5), and no ligno-furfural resin is added.
Comparative example 3
Comparative example 3 is the same as example 1 except that only lignin furfural resin was added in step (5) and no graphene powder was added.
1. And (3) measuring the temperature uniformity error of each layer:
the temperature differences between the layers of the IC carrier obtained in examples 1-2 and comparative examples 1-3 were measured during the lamination process to obtain the IC carrier. The temperature differences are reported in table 1 below.
TABLE 1
According to the temperature difference, the temperature difference between the layers of the IC carrier plate prepared in the embodiment 1-2 is less than the temperature, so that the temperature of the hot plate is effectively transferred to the layers of the IC carrier plate, and the heat loss is avoided as much as possible to avoid the pressing failure; the temperature difference between layers is less than 2 ℃, and the obtained product has good dimensional stability. By comparing the condition of not adding graphene powder, the effect of the kraft paper prepared without adding graphene powder is obviously reduced on the uniformity of heat conduction, and the temperature difference between the carrier plate and the kraft paper layer and between the kraft paper layer and the steel plate is as high as 3.94 ℃. Therefore, the micron graphene powder plays an obvious role in the preparation process of the kraft paper.
2. Kraft paper thickness uniformity test:
the maximum and minimum thickness values of the original kraft paper and the kraft paper after pressing were measured, and the thickness results are reported in table 2.
TABLE 2
According to the data, the kraft paper prepared by the invention has excellent thickness uniformity as a buffer layer of an IC carrier plate, namely, the difference of the thickness after multiple times of pressing is kept within 0.04 mm. However, in comparative examples 1-2, breakage of the kraft paper occurred, and a plurality of small holes were present, indicating that the kraft paper was broken at multiple pressing and due to insufficient mechanical properties of the kraft paper. In comparative example 3, although the kraft paper thickness uniformity was inferior to that of the present application, the difference was not so large, and still a certain good thickness uniformity was obtained. Therefore, the lignin furfural resin is added in the kraft paper manufacturing process, so that the mechanical performance of the kraft paper can be effectively improved, and the thickness uniformity of the kraft paper layer in the pressing process can be controlled. The thickness uniformity of the kraft paper after 9 times of pressing is within 0.06mm, which indicates that the kraft paper can be recycled for multiple times.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A method for manufacturing cotton pulp kraft paper for an IC carrier plate is characterized by comprising the following steps:
(1) Preparing cotton pulp: putting 70-80wt.% cotton linter and 20-30wt.% log raw material into a cooking device, adding sodium hydroxide and sodium sulfite, heating to 150-200 deg.C, controlling steam pressure at 0.3-1.2MPa, and continuously cooking for 3-6 hr;
(2) Bleaching: bleaching the cooked raw material by adopting potassium permanganate and sulfuric acid solution, wherein the pH value of the solution is controlled to be 1.5-2.1, the bleaching time is controlled to be 20-40min, and the bleaching temperature is 25-30 ℃;
(3) Fluffing: putting the bleached pulp into a single disc mill for defibering;
(4) Pulping: pulping the defibered pulp by a plurality of conical refiners connected in series, pulping by a plurality of double disc grinder pulping machines connected in series, and then washing and purifying;
(5) Adjusting slurry: adding micron graphene powder and lignin furfural resin into the slurry, and stirring to form uniform slurry;
(6) Manufacturing paper: and feeding the slurry into a fourdrinier papermaking machine, and performing sizing, drying, squeezing and calendaring to obtain the formed kraft paper.
2. The method of claim 1, wherein the sodium hydroxide is used in an amount of 1.2-1.8 wt% and the sodium sulfite is used in an amount of 2.5-3.0 wt% based on the total amount of the raw materials in the step (1).
3. The method for making cotton pulp kraft paper according to claim 1, characterized in that the concentration of potassium permanganate in step (2) is 0.15-0.3g/L and the concentration of sulfuric acid is 1.5-3g/L.
4. The method of manufacturing cotton kraft paper according to claim 1, wherein the fluffing degree in the step (3) is controlled to 3.5-4.5%.
5. The method for manufacturing cotton kraft paper according to claim 1, wherein the pulping concentration in the step (4) is controlled to 3-5% and the beating degree is controlled to 10-20 ° SR.
6. The method for making cotton kraft paper according to claim 1, wherein in the step (5), the amount of graphene is 3-8% of the weight of the pulp, and the amount of lignin furfural resin is 5-10% of the weight of the pulp.
7. The method of claim 1, wherein the pressing step in the step (6) is performed at a pressure of 0.10-0.2MPa and the calendering step is performed at a line pressure of 150-180kNn/m.
8. The method of claim 1, further comprising a dyeing step between steps (4) and (5) of adding 0.01 to 0.05% of a basic orange dye to the pulp.
9. A cotton pulp kraft paper produced by the production method according to any one of claims 1 to 8, characterized by: the kraft paper is used as a buffer layer of the IC carrier plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017713.XA CN115652682B (en) | 2022-08-23 | 2022-08-23 | Cotton pulp kraft paper for IC carrier plate and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211017713.XA CN115652682B (en) | 2022-08-23 | 2022-08-23 | Cotton pulp kraft paper for IC carrier plate and manufacturing method thereof |
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| CN115652682A true CN115652682A (en) | 2023-01-31 |
| CN115652682B CN115652682B (en) | 2023-11-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0995900A (en) * | 1995-09-29 | 1997-04-08 | Oji Paper Co Ltd | Raw paper for electrical insulation laminate |
| RU2128261C1 (en) * | 1998-05-26 | 1999-03-27 | Сыктывкарский лесной институт Санкт-Петербургской лесотехнической академии | Method of cellulose bleaching |
| RU2129179C1 (en) * | 1998-03-17 | 1999-04-20 | Сыктывкарский лесной институт Санкт-Петербургской лесотехнической академии | Method of bleaching sulfate cellulose |
| CN102383332A (en) * | 2011-10-24 | 2012-03-21 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp with high degree of polymerization and production method thereof |
| CN111501389A (en) * | 2020-04-14 | 2020-08-07 | 上海汉伦特种纤维材料有限公司 | Method for manufacturing cotton pulp hot-pressing liner paper and hot-pressing liner paper obtained by method |
-
2022
- 2022-08-23 CN CN202211017713.XA patent/CN115652682B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0995900A (en) * | 1995-09-29 | 1997-04-08 | Oji Paper Co Ltd | Raw paper for electrical insulation laminate |
| RU2129179C1 (en) * | 1998-03-17 | 1999-04-20 | Сыктывкарский лесной институт Санкт-Петербургской лесотехнической академии | Method of bleaching sulfate cellulose |
| RU2128261C1 (en) * | 1998-05-26 | 1999-03-27 | Сыктывкарский лесной институт Санкт-Петербургской лесотехнической академии | Method of cellulose bleaching |
| CN102383332A (en) * | 2011-10-24 | 2012-03-21 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp with high degree of polymerization and production method thereof |
| CN111501389A (en) * | 2020-04-14 | 2020-08-07 | 上海汉伦特种纤维材料有限公司 | Method for manufacturing cotton pulp hot-pressing liner paper and hot-pressing liner paper obtained by method |
Non-Patent Citations (1)
| Title |
|---|
| "高锰酸钾漂白纸浆", 《上海造纸》, no. 2, pages 26 - 31 * |
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