CN102864676A - Method for preparing para-aramid paper - Google Patents
Method for preparing para-aramid paper Download PDFInfo
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- CN102864676A CN102864676A CN2012103213937A CN201210321393A CN102864676A CN 102864676 A CN102864676 A CN 102864676A CN 2012103213937 A CN2012103213937 A CN 2012103213937A CN 201210321393 A CN201210321393 A CN 201210321393A CN 102864676 A CN102864676 A CN 102864676A
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Abstract
The invention discloses a method for preparing para-aramid paper. The method comprises the following steps: fully defibering, dispersing and cutting off para-aramid chopped fibers and para-aramid pulp fibers respectively in a trough type beater; adding a dispersing agent polyoxyethylene to the treated para-aramid chopped fibers and para-aramid pulp fibers respectively; mixing the treated para-aramid chopped fibers and para-aramid pulp fibers, and adding styrene-butadiene latex and cationic polyacrylamide to the mixed fibers to prepare aramid fiber pulp; and making and forming paper from the aramid fiber pulp on an inclined wire or cylinder paper making machine, drying the product, impregnating in a polyimide resin solution diluted with an N,N-dimethylacetamide solvent, and then carrying out hot-pressing with a hot press to obtain the para-aramid paper. By adopting the method, the strength, temperature tolerance and dielectric constant of para-aramid paper sheets can be effectively improved.
Description
Technical field
The invention belongs to paper industry and material industry interleaving techniques field, be specifically related to a kind of method for preparing p-aramid paper.
Background technology
Along with the development of paper industry, people are more and more higher to the requirement of paper performance, and aramid fiber is widely used in paper industry because having excellent wet processing characteristics concurrently and strengthening the property, and makes the speciality paper sill, is applied to special dimension.
Para-aramid fiber, full name are the Fanglun 1414, the English PPTA that is called for short.The Fanglun l414 fiber is one of most important organic synthetic fibers, has excellent physical and mechanical properties, thermal oxidation stability performance, anti-flammability and good electrical property etc.Characteristics outstanding in the p-aramid fiber performance are high strength and high-modulus.Its intensity can reach more than the 22CN/dtex, is 3 times of hardness of steel, is 4 times of the higher polyester industrial yarn of intensity.Its elastic modelling quantity is 4-10 times of polyester industrial yarn up to 480CN/dtex.The heat endurance of p-aramid fiber is fine, and shrinkage factor is zero in the time of 150 ℃.At high temperature still can keep higher intensity, as at 200 ℃ of lower experience 100hr, still can keep 75% of former intensity, at 160 ℃ of lower experience 500hr, still can keep 95% of former intensity.Still can keep 65%. and its continuous serviceability temperature scope of former intensity extremely wide at 260 ℃.In-196 ℃ of-204 ℃ of scopes, can normally move for a long time.
Yet p-aramid fiber paper base material strand rigid structure and fiber surface chemical inertness cause its mechanical property relatively poor, the shortcoming such as p-aramid fiber has compressive strength and modulus of compressibility is lower, humidity and ultraviolet light resistant are poor, thereby can the performance of its filamentous paper be exerted an influence, so need to take some means, strengthen the performance of para-aramid fiber paper.
PPTA-pulp (PPT-pulp) is the PPTA differentiated product, it is a kind of product of fibrillation of high dispersion, fiber surface produces fento shape filoplume, so that fiber has very large dispersiveness and specific area, make the compound resin of itself and amide-type that good compatibility be arranged, also can form hydrogen bond at interface and some resin of pulp, can strengthen composite effect.
In the preparation process of p-aramid paper, the method that adopts at present is p-aramid fiber staple fiber and PPTA-pulp to be carried out proportioning copy paper, the intensity of copying paper with respect to simple p-aramid fiber staple fiber or PPTA-pulp fiber increases, but when satisfying the field of some requirements at the higher level, still show slightly difficulty, thereby need to strengthen in other way the intensity of aramid paper.
Polyimide resin has solvable fusible, and have wear-resistant, radiation hardness, fire-retardant, characteristics such as electrical insulation capability is good, can reach 2000h 260 ℃ of lower service lifes, even still can keep 85% of room temperature mechanical strength under hot oxygen neon, maximum operation (service) temperature can reach 300 ℃.According to different production technologies, can produce the polyimide resin with different outstanding features, as having good processing characteristics and hot property with the phenylacetylene-capped polyimide resin how to encircle that contains, 5% thermal weight loss temperature improves its temperature tolerance more than 530 ℃; The polyimide resin that contains the benzyne base side chain has superior heat resistance performance and higher point toughness, and 5% thermal weight loss temperature is higher than 550 ℃, take the hot temperature of initial decomposition of cyano group capped polyimides resin as more than 540 ℃.
Summary of the invention
The purpose of this invention is to provide a kind of method for preparing p-aramid paper, solved para-aramid fiber paper intensity, temperature tolerance and the low problem of dielectric constant that existing method prepares.
The technical solution adopted in the present invention is, a kind of method for preparing p-aramid paper is specifically implemented according to following steps:
Step 1: p-aramid fiber staple fiber and PPTA-pulp fiber are discongested respectively dispersion and cut-out fully in trough-style pulp beater;
Step 2: add respectively the dispersant polyethylene glycol oxide in the p-aramid fiber staple fiber after the processing that step 1 obtains and the PPTA-pulp fiber;
Step 3: the p-aramid fiber staple fiber after the processing that step 2 is obtained and PPTA-pulp fiber mix, and add styrene-butadiene latex and cationic polyacrylamide in blended fiber, prepare the aramid fiber slurry;
Step 4: the aramid fiber slurry that step 3 is obtained is in the moulding of manufacturing paper with pulp of tiltedly net or cylinder mould machine, and drying uses the polyimide resin solution that dilutes through the DMA solvent to flood, and by hot press hot pressing, obtains p-aramid paper.
Characteristics of the present invention also are,
The amount of the polyethylene glycol oxide that adds in the step 2 wherein is with respect to 0.01% ~ 16% of aramid fiber quality.
The mixing quality of p-aramid fiber staple fiber and PPTA-pulp fiber is than being 5:5 ~ 9:1 in the step 3 wherein.
The amount of the styrene-butadiene latex that adds in the step 3 wherein is with respect to 0.5% ~ 25% of aramid fiber quality, and the amount of the cationic polyacrylamide of adding is with respect to 0.02% ~ 18% of aramid fiber quality.
The concentration of polyimide resin solution is 1% ~ 8% in the step 4 wherein.
Dipping in the step 4 wherein, the control pickup is 1% ~ 40% of relative aramid fiber quality, and dip time is 1s ~ 120s, and temperature is room temperature.
Hot pressing in the step 4 wherein, temperature are 240 ℃ ~ 280 ℃, and pressure is 11 ~ 17MPa, and hot pressing time is 3 ~ 10min.
The invention has the beneficial effects as follows, in the production process of para-aramid fiber paper, aramid paper is after the paper machine gets off, before page carries out hot pressing, the polyimide resin that aramid fiber page use is managed floods, and can effectively improve intensity, temperature tolerance and the dielectric constant etc. of p-aramid fiber page.To adopt new technology, newly fill a prescription and research and develop the environment-friendly and energy-efficient new product of producing, with high content of technology, strong innovation, have a extensive future, to promoting Hi-tech Industry Development, promote the upgrading of conventional industries, promote the class of insulating materials product, promote the development of related industry to be of great immediate significance.
Description of drawings
Fig. 1 is the process chart that the present invention prepares the method for p-aramid paper.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The present invention prepares the method for p-aramid paper, as shown in Figure 1, specifically implements according to following steps:
Step 1: p-aramid fiber staple fiber and PPTA-pulp fiber are discongested respectively dispersion and cut-out fully in trough-style pulp beater;
Step 2: add respectively dispersant polyethylene glycol oxide (PEO) in the p-aramid fiber staple fiber after the processing that step 1 obtains and the PPTA-pulp fiber, the amount of the dispersant that adds is with respect to 0.01% ~ 16% of aramid fiber quality, send poly-entanglement of wadding of process fiber to reduce stream;
Step 3: the p-aramid fiber staple fiber after the processing that step 2 is obtained and PPTA-pulp fiber mix, mixed proportion is: the mass ratio of p-aramid fiber staple fiber and PPTA-pulp fiber is 5:5 ~ 9:1, in blended fiber, add styrene-butadiene latex and cationic polyacrylamide (CPAM), the amount of the styrene-butadiene latex that adds is with respect to 0.5% ~ 25% of aramid fiber quality, the amount of the CPAM that adds is with respect to 0.02% ~ 18% of aramid fiber quality, is prepared into the aramid fiber slurry;
Step 4: the aramid fiber slurry that step 3 is obtained is in the moulding of manufacturing paper with pulp of tiltedly net or cylinder mould machine, dry, with through N, the polyimide resin that N-dimethylacetylamide (DMAC) solvent dilutes floods, the concentration of control polyimide resin solution is 1% ~ 8%, the control pickup is 1% ~ 40% of relative aramid fiber quality, dip time is 1s ~ 120s, temperature is room temperature, through hot press under 240 ℃ ~ 280 ℃, pressure is the hot pressing of carrying out 3 ~ 10min under the condition of 11 ~ 17MPa, obtains p-aramid paper.
Embodiment 1
The p-aramid fiber staple fiber that dispersion treatment is prepared and PPTA-pulp add 0.06% polyethylene glycol oxide (PEO) according to the proportioning of 5:5, and 4% styrene-butadiene latex and 6% cationic polyacrylamide (CPAM) are prepared into the aramid fiber slurry; Copy at oblique net former through wet therapy forming process and to make the p-aramid fiber body paper; Then through polyimide resin solution body paper is carried out the dipping spraying of 1% pickup, after to be dried, at 240 ℃, hot pressing 3min under the pressure of 11MPa, obtain p-aramid paper, than the p-aramid paper without polyimide resin-impregnated, the intensity of the p-aramid paper of crossing through polyimide resin-impregnated has improved, but the PPTA-pulp amount that body paper contains is excessive, thereby cause strength increase not obvious of page, because the intensity of aramid paper mainly is the intensity that is fixed against staple fiber, and the staple fiber content, can produce larger impact to the intensity of paper, the tightness of page is excessive.
Embodiment 2
The p-aramid fiber staple fiber that dispersion treatment is prepared and PPTA-pulp add 0.8% polyethylene glycol oxide (PEO) according to the proportioning of 7:3, and 6% styrene-butadiene latex and 10% cationic polyacrylamide (CPAM) are prepared into the aramid fiber slurry; Copy at oblique net former through wet therapy forming process and to make the p-aramid fiber body paper; Then through polyimide resin solution body paper is carried out the dipping spraying of 3% pickup, after to be dried, at 260 ℃, hot pressing 5min under the pressure of 14MPa, obtain p-aramid paper, than the p-aramid paper without polyimide resin-impregnated, the intensity of the p-aramid paper of crossing through polyimide resin-impregnated has improved; P-aramid fiber staple fiber and PPTA-pulp proportioning are comparatively reasonable, and each chemical addition agent consumption is also more moderate, and interfibrous adhesion is stronger, but the excessive phenomenon of page tightness can not appear yet, porosity is reasonable, and final result shows that the properties of page has all obtained good embodiment.
Embodiment 3
The p-aramid fiber staple fiber that dispersion treatment is prepared and PPTA-pulp add 4% polyethylene glycol oxide (PEO) according to the proportioning of 9:1, and 10% styrene-butadiene latex and 12% cationic polyacrylamide (CPAM) are prepared into the aramid fiber slurry; Copy at oblique net former through wet therapy forming process and to make the p-aramid fiber body paper; Then through polyimide resin solution body paper is carried out the dipping spraying of 8% pickup, after to be dried, at 280 ℃, hot pressing 8min under the pressure of 17MPa, obtain p-aramid paper, than the p-aramid paper without polyimide resin-impregnated, the intensity of the p-aramid paper of crossing through polyimide resin-impregnated has improved; But the minimizing of PPTA-pulp consumption causes the adhesion of initial fiber to reduce, and interfibrous hole is more, and the properties of page fails to reach best index.
Use polyimide resin as the dipping solution of p-aramid paper, mode by dipping or spraying makes it be dispersed in uniformly the surface of aramid paper body paper, effectively fill up the hole of aramid fiber body paper, reduced porosity, promoted the indices performance of page.
Key of the present invention is the concentration control of polyimide resin solution, because the intensity of the p-aramid paper that the process polyimide resin-impregnated is crossed, dielectric constant, the performances such as the electric property of paper can be subject to the impact of pickup, the solid content of polyimide resin own is very high, viscosity is very large, mobile relatively poor, need to pass through N, N-dimethylacetylamide (DMAC) solution dilutes, and in the process of dilution, the concentration that need to control polyimide resin solution can not be excessive, crosses conference and cause pickup excessive, although the intensity of paper increases, but the thickness of page also can increase too much, causes the final performances such as dielectric constant to descend to some extent; And the concentration of polyimide resin solution is too small, can cause pickup too small, and it is not smooth that dipping process carries out, and paper strength improves not obvious.
Claims (7)
1. a method for preparing p-aramid paper is characterized in that, specifically implements according to following steps:
Step 1: p-aramid fiber staple fiber and PPTA-pulp fiber are discongested respectively dispersion and cut-out fully in trough-style pulp beater;
Step 2: add respectively the dispersant polyethylene glycol oxide in the p-aramid fiber staple fiber after the processing that step 1 obtains and the PPTA-pulp fiber;
Step 3: the p-aramid fiber staple fiber after the processing that step 2 is obtained and PPTA-pulp fiber mix, and add styrene-butadiene latex and cationic polyacrylamide in blended fiber, prepare the aramid fiber slurry;
Step 4: the aramid fiber slurry that step 3 is obtained is in the moulding of manufacturing paper with pulp of tiltedly net or cylinder mould machine, and drying uses the polyimide resin solution that dilutes through the DMA solvent to flood, and by hot press hot pressing, obtains p-aramid paper.
2. the method for preparing p-aramid paper according to claim 1 is characterized in that, the amount of the polyethylene glycol oxide that adds in the described step 2 is with respect to 0.01% ~ 16% of aramid fiber quality.
3. the method for preparing p-aramid paper according to claim 1 is characterized in that, the mixing quality of p-aramid fiber staple fiber and PPTA-pulp fiber is than being 5:5 ~ 9:1 in the described step 3.
4. the method for preparing p-aramid paper according to claim 1, it is characterized in that, the amount of the styrene-butadiene latex that adds in the described step 3 is with respect to 0.5% ~ 25% of aramid fiber quality, and the amount of the cationic polyacrylamide of adding is with respect to 0.02% ~ 18% of aramid fiber quality.
5. the method for preparing p-aramid paper according to claim 1 is characterized in that, the concentration of polyimide resin solution is 1% ~ 8% in the described step 4.
6. the method for preparing p-aramid paper according to claim 1 is characterized in that, the dipping in the described step 4, and the control pickup is 1% ~ 40% of relative aramid fiber quality, and dip time is 1s ~ 120s, and temperature is room temperature.
7. the method for preparing p-aramid paper according to claim 1 is characterized in that, the hot pressing in the described step 4, and temperature is 240 ℃ ~ 280 ℃, and pressure is 11 ~ 17MPa, and hot pressing time is 3 ~ 10min.
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Cited By (11)
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| CN103174053A (en) * | 2013-03-26 | 2013-06-26 | 陕西科技大学 | Production method for aramid fiber 1414 paper substrate material |
| CN103572641A (en) * | 2013-10-24 | 2014-02-12 | 陕西科技大学 | Method for preparing aramid paper from para aramid fibrid as raw material |
| CN105648830A (en) * | 2016-01-13 | 2016-06-08 | 陕西科技大学 | Composite plant fiber aramid paper and preparation method thereof |
| CN105924962A (en) * | 2016-06-08 | 2016-09-07 | 铜陵方正塑业科技有限公司 | High-toughness aviation garbage bag and preparation method thereof |
| CN107022929A (en) * | 2017-05-02 | 2017-08-08 | 广东超华科技股份有限公司 | A kind of manufacture method of circuit board high-performance p-aramid fiber insulating paper |
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| WO2020037549A1 (en) * | 2018-08-22 | 2020-02-27 | 江西克莱威纳米碳材料有限公司 | Aramid fiber far-infrared emitting paper and preparation method therefor |
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| CN103174053A (en) * | 2013-03-26 | 2013-06-26 | 陕西科技大学 | Production method for aramid fiber 1414 paper substrate material |
| CN103572641A (en) * | 2013-10-24 | 2014-02-12 | 陕西科技大学 | Method for preparing aramid paper from para aramid fibrid as raw material |
| CN105648830A (en) * | 2016-01-13 | 2016-06-08 | 陕西科技大学 | Composite plant fiber aramid paper and preparation method thereof |
| CN105648830B (en) * | 2016-01-13 | 2017-12-19 | 陕西科技大学 | A kind of string aramid fiber extrusion coating paper and preparation method thereof |
| CN105924962A (en) * | 2016-06-08 | 2016-09-07 | 铜陵方正塑业科技有限公司 | High-toughness aviation garbage bag and preparation method thereof |
| CN107022929A (en) * | 2017-05-02 | 2017-08-08 | 广东超华科技股份有限公司 | A kind of manufacture method of circuit board high-performance p-aramid fiber insulating paper |
| CN107022929B (en) * | 2017-05-02 | 2019-04-05 | 广东超华科技股份有限公司 | A kind of manufacturing method of circuit board high-performance p-aramid fiber insulating paper |
| CN108755279B (en) * | 2018-07-06 | 2020-07-31 | 江西克莱威纳米碳材料有限公司 | Aramid fiber porous conductive paper and preparation method thereof |
| CN108755279A (en) * | 2018-07-06 | 2018-11-06 | 江西克莱威纳米碳材料有限公司 | A kind of aramid fiber porous, electrically conductive paper and preparation method thereof |
| CN108794790A (en) * | 2018-07-06 | 2018-11-13 | 江西克莱威纳米碳材料有限公司 | A kind of aramid fiber electromagnetic shielding paper and preparation method thereof |
| CN108794790B (en) * | 2018-07-06 | 2021-05-11 | 江西克莱威纳米碳材料有限公司 | Aramid fiber electromagnetic shielding paper and preparation method thereof |
| JP2020534446A (en) * | 2018-08-22 | 2020-11-26 | 江西克莱威納米炭材料有限公司 | Far-infrared radiation paper of aramid fiber and its manufacturing method |
| WO2020037549A1 (en) * | 2018-08-22 | 2020-02-27 | 江西克莱威纳米碳材料有限公司 | Aramid fiber far-infrared emitting paper and preparation method therefor |
| US11131064B2 (en) * | 2018-08-22 | 2021-09-28 | Nanocarbon Co., Ltd. | Aramid fiber far-infrared emitting paper and preparation method thereof |
| CN109367516A (en) * | 2018-12-07 | 2019-02-22 | 江西克莱威纳米碳材料有限公司 | A kind of automobile rearview mirror Far-infrared Heating eliminates spray device and preparation method thereof |
| CN113144751A (en) * | 2021-05-31 | 2021-07-23 | 山东聚芳新材料股份有限公司 | Composite filter material and preparation method thereof |
| CN113144751B (en) * | 2021-05-31 | 2023-04-18 | 山东聚芳新材料股份有限公司 | Composite filter material and preparation method thereof |
| CN114775325A (en) * | 2022-04-01 | 2022-07-22 | 中国石油化工股份有限公司 | Dispersing agent for aramid fiber paper and preparation method and application thereof |
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