CN105269881A - Preparation method of palm fibril nonwoven sound absorption material - Google Patents
Preparation method of palm fibril nonwoven sound absorption material Download PDFInfo
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- CN105269881A CN105269881A CN201510739741.6A CN201510739741A CN105269881A CN 105269881 A CN105269881 A CN 105269881A CN 201510739741 A CN201510739741 A CN 201510739741A CN 105269881 A CN105269881 A CN 105269881A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/20—All layers being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
- B32B2260/023—Two or more layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
- B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/72—Density
Landscapes
- Nonwoven Fabrics (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
Abstract
The invention relates to a preparation method of a palm fibril nonwoven sound absorption material. The palm fibril nonwoven sound absorption material comprises at least one palm fibril nonwoven material layer, wherein the palm fibril nonwoven material layer comprises palm hollow fibrils, and the hollowness of the palm hollow fibril is greater than or equal to 45 percent. By adopting the method, the problems of the prior art that the palm fibers are hardly used and the raw materials are wasted can be solved; moreover, the biological degradability problem of the sound absorption material is solved, and an excellent sound absorption effect also can be realized.
Description
Technical field
The present invention relates to the preparation method of the non-woven sound-absorbing material of a kind of palm fibril, belong to string and manufacture field.
Background technology
Nowadays, economic fast development result in a series of environmental problem, and urban construction, communications and transportation and modernization industry make noise pollution day by day serious, cause the common concern in the whole world.Increasing research shows, noise can have a strong impact on the physical and mental health of the mankind, the problem can bring out hypertension and heart disease etc. such as cause that Hearing, dizziness, insomnia, energy are not concentrated.The harm reducing noise is imperative.
The abundance of whole world monkey grass, only the annual production of jujube palm is just up to 4,000,000 tons, cheap.Palm is equally extensively distributed in south of the River each province of China, but less to the application of monkey grass, causes brown sheet to be abandoned arbitrarily or burn after annual pruning, causes the wasting of resources and environmental disruption.At present, the sound-absorbing material on market mainly contains melt-blown non-woven material and cotton two classes of composite sound-absorbing, and biodegradability is poor, causes a large amount of environmental pollutions.
Palm fibril can be extracted from monkey grass by simple chemical method, palm fibril is as a kind of novel natural green cellulose fibre, there is larger cavity in portion in the material, and chamber wall is thin, degree of hollowness can reach 47.1%, this special structure adds the friction between sound and fiber, has potential utilization in sound absorption field.Non-woven material is typical porous type sound-absorbing material, equally distributed hole is interconnected and extends to material surface, numerous branches adds air vibration resistance and the frictional force between air molecule and inner channel walls, effectively acoustic energy can be converted into heat energy and reduce noise.Utilize rational process technology to be prepared into non-woven material palm fibril, the advantage on fibrillar structure can be made full use of, prepare high performance sound-absorbing material.
The index of evaluating material sound absorbing capabilities is a lot, often adopts the mean value of the acoustic absorptivity of 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz six octaves to represent the average sound absorption coefficient of a certain material in engineering
, the sound absorbing capabilities of the larger expression material of its value is better.Also often think that the material that acoustic absorptivity is less than 0.2 is reflecting material, the material that acoustic absorptivity is more than or equal to 0.2 is sound-absorbing material.Palm fibril non-woven material has low-density, low energy consumption, biodegradable, renewable, the features such as good chemical stability, and has excellent sound absorbing capabilities.
Summary of the invention
The object of the invention is to provide the preparation method of the non-woven sound-absorbing material of a kind of palm fibril.
For achieving the above object, the technical solution used in the present invention is: the preparation method of the non-woven sound-absorbing material of a kind of palm fibril, the non-woven sound-absorbing material of described palm fibril comprises at least one deck palm fibril non-woven material layer, containing palm hollow fibril in described palm fibril non-woven material layer, the degree of hollowness of this palm hollow fibril is more than or equal to 45%.
Preferred technical scheme is: described palm fibril non-woven material layer is also the monkey grass through modification of 20 ~ 60% containing mass percentage.
Preferred technical scheme is: described modification refers to that partial lignin and hemicellulose are sloughed in the surface of monkey grass.
Preferred technical scheme is: the non-woven sound-absorbing material layer of described palm fibril is applied in 60 ~ 600N/m in preparation process
2pressure.
Preferred technical scheme is: containing polyacrylic acid in described palm fibril non-woven material layer.
Preferred technical scheme is: the non-woven sound-absorbing material of described palm fibril is also containing aluminium foil and meldable fibre layer.
Preferred technical scheme is: the non-woven sound-absorbing material of described palm fibril comprises some layers of palm fibril non-woven material layer, and the bulk density difference between each palm fibril non-woven material layer.
Because technique scheme is used, the present invention compared with prior art has following advantages and effect:
1, the present invention is with palm hollow fibril for raw material, prepares the non-woven sound-absorbing material of palm fibril with different reinforcement means.The control bulk density of non-woven material and the concentration of adhesive obtain optimum acoustically effective.It is low that the advantage of the non-woven sound-absorbing material of palm fibril is to produce simple cost; Can be environmental to the use of trees because of minimizing; The light fragrance of monkey grass itself and have certain biocidal property; The application of palm raw material is less, and low price, can make resource be fully used.
2, monkey grass biodegradable of the present invention, environmental protection; The density of fibrous material is low, lightweight; Good sound absorbing capabilities is all had to the sound wave of different frequency range.The present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
Embodiment one: the preparation method of the non-woven sound-absorbing material of a kind of palm fibril
The first step, by mass fraction be 2.4% NaOH and mass fraction be 3.1% hydrogen peroxide be dissolved in water, monkey grass is dropped into by bath raio 1:30, about 5h is processed under the condition of 70 DEG C, swim on solution until fiber becomes white, washing is to neutral, dry in 60 DEG C of baking ovens, obtained palm hollow fibril.
Second step, by mass fraction be 2.4% NaOH and mass fraction be 3.1% hydrogen peroxide be dissolved in water, the monkey grass cutting into about 1 ㎝ length is dropped into by bath raio 1:75, about 1h is processed under the condition of 90 DEG C, be washed to neutral post-drying, obtain modification monkey grass, slough by the monkey grass most lignin in surface and hemicellulose, obtain through modification more soft so, more very thin monkey grass.
3rd step, gets the palm hollow fibril 24g that the first step obtains and mixes through the monkey grass of modification with the 16g that second step obtains, add the 500ml aqueous solution, stirs to allow palm hollow fibril and suspending uniformly in the solution through the monkey grass of modification.
4th step, solution being poured into diameter is filter in the 120 order screening sieves of 20 ㎝, obtains uniform fleece, at the surface uniform pressurization 60N/m of screening sieve
2, dry at 80 DEG C in an oven.When material is close to constant weight, obtain palm fibril non-woven material layer, the non-woven sound-absorbing material of palm fibril of the present embodiment is made up of one deck palm fibril non-woven material layer.
The non-woven sound-absorbing material of palm fibril adopting above method to make, the applying of pressure in drying course, not only reduce size and the volume in cavity, the path of air is also made to become narrower and distortion, longer path is had to pass through when causing sound wave to pass in the material, allow more acoustic energy be converted into heat energy dissipation, with the addition of the medium and low frequency acoustically effective of the raising of the monkey grass through the modification material of 40%, average sound absorption coefficient is 0.43.All be greater than 0.2 at the acoustic absorptivity of more than 500Hz, start to have sound absorbing capabilities, at the high-frequency region of more than 4000HZ, the acoustic absorptivity of material can remain on more than 0.9, ranges up to 0.93.
Embodiment two: the preparation method of the non-woven sound-absorbing material of a kind of palm fibril
The first step, by mass fraction be 2.4% NaOH and mass fraction be 3.1% hydrogen peroxide be dissolved in water, monkey grass is dropped into by bath raio 1:30, about 5h is processed under the condition of 70 DEG C, swim on solution until fiber becomes white, washing is to neutral, and drying in 60 DEG C of baking ovens, produces palm hollow fibril.
Second step, gets 10g polyacrylic acid, is dissolved in 990ml water at 90 DEG C, makes the solution that mass fraction is 1%.
3rd step, takes the palm hollow fibril that the 40g first step is obtained, adds the polyacrylic acid solution that 500ml mass fraction is 1%, stirs and allows palm hollow fibril suspend uniformly in the solution.
4th step, solution being poured into diameter is filter in the 120 order screening sieves of 20 ㎝, obtains uniform fleece, puts drying at 80 DEG C in an oven.When material is close to constant weight, taken out by non-woven material from screening sieve, obtain palm fibril non-woven material layer, the non-woven sound-absorbing material of palm fibril of the present embodiment is made up of one deck palm fibril non-woven material layer.
The non-woven sound-absorbing material of palm fibril adopting above method to make, palm hollow fibril has the degree of hollowness of more than 45%, polyacrylic acid has good film forming, a large amount of abundant foam is produced in the process stirred, in drying process, the loose structure part of these formation of foams is retained, define the structure more optimized, improve sound absorbing capabilities, average sound absorption coefficient is 0.45.All be greater than 0.2 at the acoustic absorptivity of more than 500Hz, start that there is sound absorbing capabilities.When sound frequency is 1000Hz, the acoustic absorptivity of material reaches 0.6, and at the high-frequency region of more than 4000HZ, the acoustic absorptivity of material can remain on more than 0.9, ranges up to 0.93.
Embodiment three: the preparation method of the non-woven sound-absorbing material of a kind of palm fibril
The first step, by mass fraction be 2.4% NaOH and mass fraction be 3.1% hydrogen peroxide be dissolved in water, monkey grass is dropped into by bath raio 1:30, about 5h is processed under the condition of 70 DEG C, swim on solution until fiber becomes white, washing is to neutral, and drying in 60 DEG C of baking ovens, produces palm hollow fibril.
Second step, gets 4 parts of 6g palm hollow fibrils, adds the 200ml aqueous solution respectively, stirs and allows palm fibril suspend uniformly in the solution.
3rd step, is filter in the 120 order screening sieves of 20cm by wherein 2 parts of solution pour diameter into, obtains uniform fleece, in an oven drying at 80 DEG C.When material is close to constant weight, non-woven material is taken out from screening sieve, obtain the first palm fibril non-woven material layer.
4th step, is filter in the 120 order screening sieves of 20 ㎝ by wherein 2 parts of solution pour diameter into, obtains uniform fleece, at the surface uniform pressurization 100N/m of screening sieve
2, drying at 80 DEG C in an oven.When material is close to constant weight, non-woven material is taken out from screening sieve, obtain the second palm fibril non-woven material layer.
5th step, folds to obtain the non-woven sound-absorbing material of palm fibril according to the sequential layer of the second palm fibril non-woven material layer, the first palm fibril non-woven material layer, aluminium foil, the first palm fibril non-woven material layer and the second palm fibril non-woven material layer.Be glued together with meldable fibre between layers.
The average sound absorption coefficient of the non-woven sound-absorbing material of palm fibril reaches more than 0.5.All be greater than 0.2 at the acoustic absorptivity of more than 100Hz material, start that there is sound absorbing capabilities.Can reach 0.3 at the acoustic absorptivity of 500Hz, when sound frequency is 800Hz, the acoustic absorptivity of material reaches 0.7, after this along with the acoustic absorptivity of the elevated material of frequency has the fluctuation of numerical values recited to change, but maintains more than 0.7 always.At the high-frequency region of more than 2500HZ, the acoustic absorptivity of material reaches maximum more than 0.95.
Embodiment four: the preparation method of the non-woven sound-absorbing material of a kind of palm fibril
The non-woven sound-absorbing material of palm fibril is made up of the first palm fibril non-woven material layer of embodiment three, and the degree of hollowness of this palm hollow fibril is 46%.
Embodiment five: the preparation method of the non-woven sound-absorbing material of a kind of palm fibril
The palm fibril non-woven material layer that the palm fibril non-woven material layer that the non-woven sound-absorbing material of palm fibril is obtained by embodiment one, embodiment two obtain, aluminium foil, the second palm fibril non-woven material layer of embodiment three, the first palm fibril non-woven material layer stack gradually and form, and are glued together between layers with meldable fibre.
The present invention adopts palm hollow fibril to utilize different reinforcing modes to prepare non-woven material, has good sound-absorbing effect.Palm hollow fibril has the degree of hollowness of more than 45%, and diameter is about 10 μm.The raw material preparing non-woven material can be 100% palm fibril, also can mix with the monkey grass after modification.Palm hollow fibril non-woven material can control its surface density, long fiber content and bulk density and obtain the good material of sound-absorbing effect.Fibril can suspend in aqueous, and the mode through wet-laying is processed into non-woven material, the mode also can reinforced with bonding, or mixes with the monkey grass after chemical treatment and adopt pinprick reinforcement.Monkey grass after modification refers to slough the monkey grass most lignin in surface and hemicellulose, obtain more soft so, more very thin monkey grass.
The non-woven sound-absorbing material of palm fibril that the present invention obtains, sound frequency is when more than 100Hz, and the acoustic absorptivity of material is all greater than 0.2, has sound absorbing capabilities.Can reach 0.3 at the acoustic absorptivity of 500Hz, when sound frequency is 800Hz, the acoustic absorptivity of material reaches 0.7, after this along with the acoustic absorptivity of the elevated material of frequency has the fluctuation of numerical values recited to change, but maintains more than 0.7 always.At the high-frequency region of more than 2500HZ, the acoustic absorptivity of material reaches maximum 0.95.Represent the average sound absorption coefficient of a certain material with the mean value of the acoustic absorptivity of 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz six octaves, its numerical value can reach about 0.5.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. the preparation method of the non-woven sound-absorbing material of palm fibril, it is characterized in that: the non-woven sound-absorbing material of described palm fibril comprises at least one deck palm fibril non-woven material layer, containing palm hollow fibril in described palm fibril non-woven material layer, the degree of hollowness of this palm hollow fibril is more than or equal to 45%.
2. preparation method according to claim 1, is characterized in that: described palm fibril non-woven material layer is also the monkey grass through modification of 20 ~ 60% containing mass percentage.
3. preparation method according to claim 2, is characterized in that: described modification refers to that partial lignin and hemicellulose are sloughed in the surface of monkey grass.
4. preparation method according to claim 1, is characterized in that: the non-woven sound-absorbing material layer of described palm fibril is applied in 60 ~ 600N/m in preparation process
2pressure.
5. preparation method according to claim 1, is characterized in that: containing polyacrylic acid in described palm fibril non-woven material layer.
6. preparation method according to claim 1, is characterized in that: the non-woven sound-absorbing material of described palm fibril is also containing aluminium foil and meldable fibre layer.
7. preparation method according to claim 1, is characterized in that: the non-woven sound-absorbing material of described palm fibril comprises some layers of palm fibril non-woven material layer, and the bulk density difference between each palm fibril non-woven material layer.
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Cited By (3)
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| CN109629112A (en) * | 2018-12-14 | 2019-04-16 | 广东职业技术学院 | A kind of collagen/monkey grass composite nonwoven material and preparation method thereof |
| CN111923560A (en) * | 2020-07-29 | 2020-11-13 | 浙江工业职业技术学院 | Preparation process of sound absorption composite material |
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| CN109629112B (en) * | 2018-12-14 | 2022-03-25 | 广东职业技术学院 | Collagen/palm fiber composite non-woven material and preparation method thereof |
| CN111923560A (en) * | 2020-07-29 | 2020-11-13 | 浙江工业职业技术学院 | Preparation process of sound absorption composite material |
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