CN104264451A - Method for improving aramid surface activity - Google Patents
Method for improving aramid surface activity Download PDFInfo
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- CN104264451A CN104264451A CN201410532037.9A CN201410532037A CN104264451A CN 104264451 A CN104264451 A CN 104264451A CN 201410532037 A CN201410532037 A CN 201410532037A CN 104264451 A CN104264451 A CN 104264451A
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- aramid fiber
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- potassium permanganate
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Abstract
The invention provides a method for improving aramid surface activity. The method comprises the following steps: (1) aramid fiber surface pretreatment; (2) aramid fiber surface activation treatment, to be specific, firstly, preparing potassium permanganate solutions with different concentrations; secondly, shearing pre-treated aramid fibers into samples of about 20cm, placing the samples in the potassium permanganate solutions, and treating at a certain temperature for a certain period of time; thirdly, washing the activated fibers with deionized water until the pH value of washing liquid is 7; fourthly, drying the washed activated fibers to obtain the surface modified aramid fibers. The method for improving aramid surface activity, provided by the invention, not only can obviously improve the aramid surface activity, but also has the advantages of simple technology, few treatment procedures, easily controlled treatment conditions, few devices required by reaction and low investment cost and is suitable for industrial production and application.
Description
Technical field
The present invention relates to a kind of surface-active method of raising aramid fiber, belong to aramid fiber processing technology field.
Background technology
Aramid fiber is a kind of rigid macromolecule with high-orientation and high-crystallinity, and molecular symmetry is high, and horizontal intermolecular force is weak; In addition owing to there is a large amount of aromatic rings in molecule, its intermolecular hydrogen bond is died down, low the making of transverse strength easily produces fracture under compression and shearing force effect.This structural feature makes the inertia that aramid fiber surface presentation is larger, and reactivity is low, causes the interface adhesiveness between the matrix such as aramid fiber and resin very poor.In order to play the mechanical property of aramid fiber excellence better, improve the interface bonding state of aramid fiber reinforced composite, just must to the process of aramid fiber modifying surface.
At present, the method for aramid fiber surface modification mainly contains: surperficial cladding process, plasma surface modification, ultrasonic wave process, surface graft modification etc.
Surface cladding process is the method for carrying out surface modification at fiber surface coating one layer of polymeric resin or low-molecular material confrontation fiber.
Plasma surface modification utilizes plasma to cause high polymer generation free radical to react, then by reactions such as radical transfer subsequently, oxidation and couplings, form active group, improve the surface property of fiber at fiber surface.
The high temperature that ultrasonic wave process mainly utilizes ultrasonic wave to cause in a liquid to produce during bubbles burst, high pressure and local shock effect cause the change of fiber surface, thus reduce surface free energy, improve resin-dipping performance.
Surface graft modification utilizes chemical reagent and aramid fiber surface to react, and introduces the active group that can react at fiber surface, forms covalent bond can there is chemical reaction with matrix material compound tense, thus increase the interface adhesion of material and matrix.
Other also have the methods such as modification by copolymerization, rare earth modified, fluorine process.
When carrying out modification with said method, there are the following problems: complex process, and treatment step is many, and some treatment conditions are harsh, and the equipment of reaction needed is many, and cost of investment is large, and industrialization difficulty is larger.
The invention provides a kind of surface-active method of raising aramid fiber, its technique is simple, and treatment process is few, and treatment conditions easily control, and the equipment of reaction needed is few, low in investment cost, is suitable for suitability for industrialized production and application.
Summary of the invention
Object of the present invention provides a kind of just and improves the surface-active method of aramid fiber for weak point existing in above-mentioned prior art, it is characterized in that, it comprises the following steps:
(1) surface preparation of aramid fiber:
Aramid fiber is positioned over heating in acetone and boils certain hour, be then immersed in heating in absolute ethyl alcohol and boil certain hour; Then be positioned in deionized water by described aramid fiber and wash, the finishing agent on surface in removing fiber process, by aramid fiber dry certain hour in electric heating constant-temperature blowing drying box after being disposed.
(2) surface activation process of aramid fiber:
1. the liquor potassic permanganate of variable concentrations is prepared;
2. pretreated aramid fiber is cut into the sample of about 20cm, is placed in above-mentioned liquor potassic permanganate, processes a period of time at a certain temperature;
3. the fiber deionized water after above-mentioned activation is washed, until washing lotion pH value is 7;
4. the activated fiber after above-mentioned cleaning is carried out drying, i.e. obtained surface modification aramid fiber.
Further, as preferably, in order to improve effect and the quality of the surface preparation of aramid fiber, in described step (1), aramid fiber is positioned in acetone that to heat the set of time boiled be 1 hour, is then immersed in absolute ethyl alcohol that to heat the set of time boiled be 1 hour.
Further, as preferably, in order to improve effect and the quality of the surface preparation of aramid fiber further, in described step (1), it is 2 hours by the set of time that fiber is dry in electric heating constant-temperature blowing drying box after being disposed.
Further, as preferably, in order to improve the quality of the surface activation process of aramid fiber, further raising aramid fiber surface-activity, step in described step (2) 1. in, when preparing potassium permanganate, controlling the concentration of potassium permanganate is 10% ~ 30%.
Further, as preferably, the step in described step (2) 2. in, when being placed in liquor potassic permanganate, solution temperature controls at 50 DEG C ~ 80 DEG C, and the reaction time controls at 30min ~ 60min.
Compare before and after aramid fiber surface process of the present invention, after potassium permanganate surface preparation, the hydroxyl of fiber, carboxyl and amino group content obviously increase, and actively increase, potassium permanganate surface preparation makes aramid fiber surface roughness increase, the adhesive property of the matrices of composite material such as fiber and resin increases thereupon, x-ray photoelectron spectroscopy analysis is adopted to find, potassium permanganate surface preparation makes aramid fiber surface oxygen content and hydroxyl group content significantly increase, and, aramid fiber is after potassium permanganate surface preparation, the fracture strength of its fiber self declines little, after single fiber pull-out test experiment shows surface treatment, the interlaminar shear strength of the matrices of composite material such as aramid fiber and resin is improved significantly, compared with existing technique, the surface-active method of raising aramid fiber provided by the invention, it not only can improve aramid fiber surface-activity significantly, and its technique is simple, treatment process is few, treatment conditions easily control, the equipment of reaction needed is few, low in investment cost, be suitable for suitability for industrialized production and application.
Accompanying drawing explanation
Fig. 1 adopts method of the present invention to the structure change before and after aramid fiber surface process;
Fig. 2 adopts method of the present invention to aramid fiber after potassium permanganate surface preparation, the change curve of the fracture strength of its fiber self;
Fig. 3 adopts method of the present invention to aramid fiber after potassium permanganate surface preparation, the change curve of the interlaminar shear strength of the matrices of composite material such as aramid fiber and resin;
In Fig. 4, table 1 adopts x-ray photoelectron spectroscopy to after the surface preparation of employing potassium permanganate, aramid fiber surface oxygen content and hydroxyl group content change list.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
The invention provides a kind of surface-active method of raising aramid fiber, it comprises the following steps:
(1) surface preparation of aramid fiber:
Aramid fiber is positioned over heating in acetone and boils certain hour, be then immersed in heating in absolute ethyl alcohol and boil certain hour; Then be positioned in deionized water by aramid fiber and wash, the finishing agent on surface in removing fiber process, by aramid fiber dry certain hour in electric heating constant-temperature blowing drying box after being disposed.
(2) surface activation process of aramid fiber:
1. the liquor potassic permanganate of variable concentrations is prepared;
2. pretreated aramid fiber is cut into the sample of about 20cm, is placed in above-mentioned liquor potassic permanganate, processes a period of time at a certain temperature;
3. the fiber deionized water after above-mentioned activation is washed, until washing lotion pH value is 7;
4. the activated fiber after above-mentioned cleaning is carried out drying, i.e. obtained surface modification aramid fiber.
In the present embodiment, in order to improve effect and the quality of the surface preparation of aramid fiber, in described step (1), aramid fiber is positioned in acetone that to heat the set of time boiled be 1 hour, is then immersed in absolute ethyl alcohol that to heat the set of time boiled be 1 hour.In order to improve effect and the quality of the surface preparation of aramid fiber further, in described step (1), it is 2 hours by the set of time that fiber is dry in electric heating constant-temperature blowing drying box after being disposed.
In addition, in order to improve the quality of the surface activation process of aramid fiber, further raising aramid fiber surface-activity, step in described step (2) 1. in, when preparing potassium permanganate, controlling the concentration of potassium permanganate is 10% ~ 30%, step in described step (2) 2. in, when being placed in liquor potassic permanganate, solution temperature controls at 50 DEG C ~ 80 DEG C, and the reaction time controls at 30min ~ 60min.
Compare before and after aramid fiber surface process of the present invention, after potassium permanganate surface preparation, the hydroxyl of fiber, carboxyl and amino group content obviously increase, and actively increase, potassium permanganate surface preparation makes aramid fiber surface roughness increase, the adhesive property of the matrices of composite material such as fiber and resin increases thereupon, x-ray photoelectron spectroscopy analysis is adopted to find, potassium permanganate surface preparation makes aramid fiber surface oxygen content and hydroxyl group content significantly increase, and, aramid fiber is after potassium permanganate surface preparation, the fracture strength of its fiber self declines little, after single fiber pull-out test experiment shows surface treatment, the interlaminar shear strength of the matrices of composite material such as aramid fiber and resin is improved significantly, compared with existing technique, the surface-active method of raising aramid fiber that the invention provides, it not only can improve aramid fiber surface-activity significantly, and its technique is simple, treatment process is few, treatment conditions easily control, the equipment of reaction needed is few, low in investment cost, be suitable for suitability for industrialized production and application.
Fig. 1 adopts a kind of surface-active method of aramid fiber that improves provided by the invention to process the structure change before and after aramid fiber surface process, wherein a is aramid fiber before process, b is aramid fiber after process, according to infrared spectrum, after potassium permanganate surface preparation, the hydroxyl of fiber, carboxyl and amino group content obviously increase, and actively increase.For surface topography, the invention provides a kind of raising in the surface-active method of aramid fiber, potassium permanganate surface preparation makes aramid fiber surface roughness increase, and the adhesive property of the matrices of composite material such as fiber and resin increases thereupon.
Employing x-ray photoelectron spectroscopy is analyzed, and as shown in table 1, potassium permanganate surface preparation of the present invention makes aramid fiber surface oxygen content and hydroxyl group content significantly increase.
In addition, the mechanical property before and after aramid fiber surface process is compared, and aramid fiber is after potassium permanganate surface preparation, and the fracture strength of its fiber self declines little, sees Fig. 2; After single fiber pull-out test experiment shows surface treatment, the interlaminar shear strength of the matrices of composite material such as aramid fiber and resin is improved significantly, and sees Fig. 3.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (5)
1. improve the surface-active method of aramid fiber, it is characterized in that, it comprises the following steps:
(1) surface preparation of aramid fiber:
Aramid fiber is positioned over heating in acetone and boils certain hour, be then immersed in heating in absolute ethyl alcohol and boil certain hour; Then be positioned in deionized water by described aramid fiber and wash, the finishing agent on surface in removing fiber process, by aramid fiber dry certain hour in electric heating constant-temperature blowing drying box after being disposed.
(2) surface activation process of aramid fiber:
1. the liquor potassic permanganate of variable concentrations is prepared;
2. pretreated aramid fiber is cut into the sample of about 20cm, is placed in above-mentioned liquor potassic permanganate, processes a period of time at a certain temperature;
3. the fiber deionized water after above-mentioned activation is washed, until washing lotion pH value is 7;
4. the activated fiber after above-mentioned cleaning is carried out drying, i.e. obtained surface modification aramid fiber.
2. one according to claim 1 improves the surface-active method of aramid fiber, it is characterized in that, in described step (1), aramid fiber is positioned in acetone that to heat the set of time boiled be 1 hour, is then immersed in absolute ethyl alcohol that to heat the set of time boiled be 1 hour.
3. one according to claim 1 improves aramid fiber surface-active method, it is characterized in that, in described step (1), is 2 hours by the set of time that fiber is dry in electric heating constant-temperature blowing drying box after being disposed.
4. one according to claim 1 improves aramid fiber surface-active method, it is characterized in that, the step in described step (2) 1. in, when preparing potassium permanganate, the concentration controlling potassium permanganate is 10% ~ 30%.
5. one according to claim 1 improves the surface-active method of aramid fiber, it is characterized in that, the step in described step (2) 2. in, when being placed in liquor potassic permanganate, solution temperature controls at 50 DEG C ~ 80 DEG C, and the reaction time controls at 30min ~ 60min.
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| CN201410532037.9A CN104264451A (en) | 2014-10-10 | 2014-10-10 | Method for improving aramid surface activity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104711851A (en) * | 2015-04-03 | 2015-06-17 | 贾曌 | Method for improving surface activity of aramid fibers |
| CN106758150A (en) * | 2017-01-23 | 2017-05-31 | 西安工程大学 | A kind of method for improving kevlar fabric wetness guiding perspiration discharging performance |
| CN111118907A (en) * | 2019-12-28 | 2020-05-08 | 宜禾股份有限公司 | Preparation process of polyaniline aramid composite conductive fiber applied to protective clothing |
| CN117466569A (en) * | 2023-12-28 | 2024-01-30 | 北京玻钢院复合材料有限公司 | Honeycomb structure reinforced aerogel-phenolic resin matrix composite material and preparation method thereof |
-
2014
- 2014-10-10 CN CN201410532037.9A patent/CN104264451A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104711851A (en) * | 2015-04-03 | 2015-06-17 | 贾曌 | Method for improving surface activity of aramid fibers |
| CN106758150A (en) * | 2017-01-23 | 2017-05-31 | 西安工程大学 | A kind of method for improving kevlar fabric wetness guiding perspiration discharging performance |
| CN111118907A (en) * | 2019-12-28 | 2020-05-08 | 宜禾股份有限公司 | Preparation process of polyaniline aramid composite conductive fiber applied to protective clothing |
| CN117466569A (en) * | 2023-12-28 | 2024-01-30 | 北京玻钢院复合材料有限公司 | Honeycomb structure reinforced aerogel-phenolic resin matrix composite material and preparation method thereof |
| CN117466569B (en) * | 2023-12-28 | 2024-04-12 | 北京玻钢院复合材料有限公司 | Honeycomb structure reinforced aerogel-phenolic resin matrix composite material and preparation method thereof |
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Application publication date: 20150107 |