CN104831397A - Preparation method of acrylon pulp - Google Patents
Preparation method of acrylon pulp Download PDFInfo
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- CN104831397A CN104831397A CN201510257572.2A CN201510257572A CN104831397A CN 104831397 A CN104831397 A CN 104831397A CN 201510257572 A CN201510257572 A CN 201510257572A CN 104831397 A CN104831397 A CN 104831397A
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Abstract
The invention relates to a preparation method of acrylon pulp. The preparation method comprises the steps of preparing an acrylon tow fiber by virtue of an electrospinning technique, and carrying out chopping, dispersing and grinding, so as to obtain an acrylon pulp fiber, wherein the grinding is carried out by virtue of a screw type pulping machine; the screw type pulping machine comprises a grinding channel and a screw rod; the screw rod is arranged in the grinding channel, and a screw thread crest on the screw rod is a rough surface. By virtue of the screw type pulping machine, the rough surface of the screw thread crest of the screw rod is matched with the inner wall of the grinding channel when an acrylon short fiber is conveyed so as to grind, so that the working efficiency is improved; secondly, the grinding of the screw type pulping machine is relatively adequate and uniform, so that a branch structure of the acrylon pulp fiber is relatively uniform, and the tensile strength of the material is improved; besides, compared with a disc type pulping machine, the screw type pulping machine has the advantages that the wear is little, the utilization ratio of raw materials is improved, and the cost is saved.
Description
Technical field
The present invention relates to the preparation method of acrylic fibers pulp.
Background technology
Acrylic fibers pulp except have the excellence that itself has environmental suitability, to except the insensitive and higher serviceability temperature of humidity, also have that high, in body the dispersive property of original fiber degree is good and dry, the feature of the good processability that wets.Can replace asbestos or Fanglun slurry cake in most cases for multiple fields such as rubbed sealing material, speciality paper, nonwoven fabric, cost performance is higher.The processing performance of compound can be improved in friction material, improve the intensity of goods and ABRASION RESISTANCE, reduce brake noise, also can and rockwool coating resin, other compound uses such as flax fibre, for without asbestos disc brake pad, drum-type brake pad and clutch disc.Namely tensile strength and sealing property can be improved for encapsulant.
In prior art, acrylic fibers preparation technology is roughly as follows, utilizes electrostatic spinning technique to obtain acrylic fibre tow fiber, obtains acrylic fibers dissolving pulp-like fibre through cutting, dispersion, grinding.Wherein detailed process is as follows: prescinded by the acrylic fibre tow fiber of formation, then the fiber dispersion of prescinding is formed suspension in water, recycling disc type (single-deck or double plate) fiberizer grinds, finally obtain pulp fibers, its structure is dendroid distribution, namely every root limb all has many fentos, surface hairiness is very abundant.But wherein in cutting process, normally being prescinded by acrylic fibre tow is the staple fibre of 5 ~ 8mm, the fiber of 1.5 ~ 2.5mm is obtained after grinding, visible staple fibre in process of lapping after cutting needs to be prescinded further, it is comparatively large to wear and tear, and final staple length wider distribution, grind uneven.
Summary of the invention
The technical problem to be solved in the present invention is: overcome in prior art and wear and tear comparatively large in acrylic fibers process of lapping, narrow and shallow distribution of lengths is wider, grind uneven deficiency, provides a kind of preparation method of acrylic fibers pulp.
The technical solution adopted for the present invention to solve the technical problems is: a kind of preparation method of acrylic fibers pulp, prepares acrylic fibre tow fiber by electrostatic spinning technique, through prescinding, disperseing, grind, obtains acrylic fibers pulp fibers; Wherein said grinding screw formula fiberizer grinding;
Described screw fiberizer comprises grinding passage and is arranged on the screw rod in grinding passage, and on described screw rod, thread crest is rough surface.
Further, for ease of the dispersiveness of acrylic staple fibre, described acrylic fibre tow fiber length after prescinding is 3mm.
As preferably, be improve grinding efficiency and grinding effect, described thread crest surface is provided with array of protrusions or groove array.
Further, for improving grinding efficiency further, described grinding vias inner walls is rough surface, utilizes grinding vias inner walls rough surface to match with thread crest rough surface and carries out the grinding of acrylic staples.
As preferably, described grinding vias inner walls is provided with array of protrusions or groove array.
As preferably, for ensureing grinding effect, acrylic staples both fully being ground, overmastication can not cause wearing and tearing again, the spacing of described thread crest and grinding vias inner walls is 10 ~ 30 μm.
As preferably, described dispersion refers to and the acrylic fiber after prescinding is scattered in the turbid liquid forming 0.5 ~ 4wt% in water, acrylic fibers are narrow and shallow be scattered in water after the too small meeting of concentration cause grinding efficiency low, grind insufficient phenomenon, if and excessive concentration, then can increase wearing and tearing, even cause the blocking of grinding passage.
The invention has the beneficial effects as follows, of the present inventionly utilize screw fiberizer, in acrylic staples transportation, utilize the rough surface of screw flight crest to coordinate with grinding vias inner walls simultaneously acrylic staples is ground, improve operating efficiency; Secondly, compared to ventional disc fiberizer, the screw fiberizer grinding in the application more fully, evenly, make acrylic fibers pulp fibers dendritic structure evenly, improve the tensile strength of material; In addition, compared to disc type paste mill, screw fiberizer wearing and tearing few (after grinding 3mm acrylic staples, acrylic fibers length is 2.7 ~ 3mm), improve the utilization rate of raw material, provide cost savings.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is screw fiberizer structural representation;
Fig. 2 is circle inner structure enlarged drawing in Fig. 1;
Fig. 3 is acrylic fibers dissolving pulp-like fibre 600 times of SEM figure prepared by embodiment 1
In figure: 1. grind passage, 2. screw rod, 21. thread crest, 22. array of protrusions.
Detailed description of the invention
The present invention is further detailed explanation in conjunction with the accompanying drawings and embodiments now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
As illustrated in fig. 1 and 2, the screw rod 2 that a kind of screw fiberizer comprises grinding passage 1 and is arranged in grinding passage 1, on described screw rod 2, thread crest 21 surface is provided with array of protrusions 22 or groove array, form rough surface, described grinding passage 1 inwall is also provided with the rough surface that to match with described thread crest 21 surface, described thread crest 21 is not less than 10 μm with the minimum place of spacing of grinding passage 1 inwall, and maximum is no more than 30 μm.Wherein grind passage 1 segment and be respectively charging aperture and discharging opening, by pump, acrylic staples dispersion liquid is pumped to charging aperture, utilize the transfer capability of screw rod 2 to be fed forward by dispersion liquid, to utilize on screw rod 2 thread crest 21 surface simultaneously and grind passage 1 inner wall surface and match acrylic staples ground.
Embodiment 1
Taking 10kg is dissolved in the sodium thiocyanate water solution of 44% of 670kg containing the fine condensate of polypropylene of 7.5% methyl acrylate, taking 90kg is again dissolved in above-mentioned solution containing the polyacrylonitrile condensate of 7.5% vinylacetate, form two component blend spinning solution, this solution adopts conventional polypropylene nitrile fiber wet spinning technology, comprise the processes such as spinning, stretching, washing, drying, obtain polyacrylonitrile blended fibre bundle.
The fibre bundle obtained is cut at fibre cutting machine the staple fibre that length is 3mm, taking 50kg is scattered in 10t water, screw fiberizer is pumped into the flow of 3t/h, slurries obtain acrylic fibers dissolving pulp-like fibre through centrifugal drying, distribution of lengths is 2.7 ~ 3mm, degree Schopper-Riegler is 46.2 ° of SR, and specific area is 31.4m
2/ g, tensile strength 485MPa.
Comparative example 1
Screw fiberizer in embodiment 1 is replaced with double disc refiner of the prior art, and other conditions are constant.The distribution of lengths finally obtaining acrylic fibers dissolving pulp-like fibre is 1.4 ± 0.5mm, and degree Schopper-Riegler is 40.3 ° of SR, and specific area is 14.2m
2/ g, tensile strength 430MPa.
Embodiment 2
Polyacrylonitrile blended fibre bundle obtained in embodiment 1 is cut into through cutting machine the staple fibre that length is 3mm, taking 50kg is scattered in 5t water, screw fiberizer is pumped into the flow of 3t/h, slurries obtain acrylic fibers dissolving pulp-like fibre through centrifugal drying, distribution of lengths is 2.8 ~ 3mm, degree Schopper-Riegler is 46.5 ° of SR, specific area 30.2m
2/ g, tensile strength 480MPa.
Comparative example 2
Screw fiberizer in embodiment 1 is replaced with single-plate paste mill of the prior art, and other conditions are constant.The distribution of lengths finally obtaining acrylic fibers dissolving pulp-like fibre is 1.6 ± 0.4mm, and degree Schopper-Riegler is 41.3 ° of SR, and specific area is 13.5m
2/ g, tensile strength 420MPa.
Embodiment 3
Polyacrylonitrile blended fibre bundle obtained in embodiment 1 is cut into through cutting machine the staple fibre that length is 3mm, taking 50kg is scattered in 1.25t water, screw fiberizer is pumped into the flow of 3t/h, slurries obtain acrylic fibers dissolving pulp-like fibre through centrifugal drying, distribution of lengths is 2.7 ~ 3mm, degree Schopper-Riegler is 46.0 ° of SR, specific area 30.8m
2/ g, tensile strength 483MPa.
Comparative example 3
Screw fiberizer in embodiment 1 is replaced with single-plate paste mill of the prior art, and other conditions are constant.The distribution of lengths finally obtaining acrylic fibers dissolving pulp-like fibre is 1.2 ± 0.6mm, and degree Schopper-Riegler is 43.3 ° of SR, specific area 14.2m
2/ g, tensile strength 425MPa.
From above-mentioned comparative example and embodiment contrast, although be only the difference of milling apparatus, the acrylic fibers dissolving pulp-like fibre length obtained after the grinding of ventional disc fiberizer greatly reduces compared to before grinding, causes and weares and teares significantly, and distribution of lengths is wider, grind uneven; In addition, acrylic fibers pulp fibers specific area after the grinding of ventional disc fiberizer is less, the half of the acrylic fibers pulp fibers specific area only having the application to prepare, illustrate the acrylic fibers dissolving pulp-like fibre dendritic structure prepared in the application more evenly, surface hairiness abundanter (as shown in Figure 3), improve the tensile strength of acrylic fibers dissolving pulp-like fibres simultaneously.
Claims (7)
1. a preparation method for acrylic fibers pulp, is characterized in that: prepare acrylic fibre tow fiber by electrostatic spinning technique, through prescinding, disperseing, grind, obtains acrylic fibers pulp fibers; Wherein said grinding is ground through screw fiberizer;
The screw rod (2) that described screw fiberizer comprises grinding passage (1) and is arranged in grinding passage (1), the upper thread crest (21) of described screw rod (2) is rough surface.
2. the preparation method of acrylic fibers pulp according to claim 1, is characterized in that: described acrylic fibre tow fiber length after prescinding is 3mm.
3. the preparation method of acrylic fibers pulp according to claim 1, is characterized in that: described thread crest (21) surface is provided with array of protrusions (22) or groove array.
4. the preparation method of acrylic fibers pulp according to claim 1, is characterized in that: described grinding passage (1) inwall is rough surface.
5. the preparation method of acrylic fibers pulp according to claim 4, is characterized in that: described grinding passage (1) inwall is provided with array of protrusions (22) or groove array.
6. the preparation method of acrylic fibers pulp according to claim 1, is characterized in that: described thread crest (21) is 10 ~ 30 μm with the spacing of grinding passage (1) inwall.
7. the preparation method of acrylic fibers pulp according to claim 1, is characterized in that: described dispersion refers to and the acrylic fiber after prescinding is scattered in the turbid liquid forming 0.5 ~ 4wt% in water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510257572.2A CN104831397B (en) | 2015-05-19 | 2015-05-19 | A kind of preparation method of acrylic fibers pulp |
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| CN201510257572.2A CN104831397B (en) | 2015-05-19 | 2015-05-19 | A kind of preparation method of acrylic fibers pulp |
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| CN104831397A true CN104831397A (en) | 2015-08-12 |
| CN104831397B CN104831397B (en) | 2017-06-06 |
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| CN201510257572.2A Expired - Fee Related CN104831397B (en) | 2015-05-19 | 2015-05-19 | A kind of preparation method of acrylic fibers pulp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113502685A (en) * | 2021-06-23 | 2021-10-15 | 华南理工大学 | Polyacrylonitrile pulp, preparation method thereof and application thereof in preparation of carbon rod filter element |
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| US4284247A (en) * | 1977-12-06 | 1981-08-18 | Eriksson Erik F | Apparatus for defibrating and conditioning nonflowable cellulosic material |
| US4708623A (en) * | 1983-03-14 | 1987-11-24 | Chisso Corporation | Apparatus for producing organic filler-blended resin compositions |
| CN2291435Y (en) * | 1997-04-20 | 1998-09-16 | 刘长恩 | Double-screw beating mill |
| JP2001062316A (en) * | 1999-08-26 | 2001-03-13 | Yamamoto Co Ltd | Single-screw grinding and polishing grain-milling machine |
| CN1292445A (en) * | 1999-09-24 | 2001-04-25 | 刘长恩 | Chemical mechanical pulp-making method and equipment |
| CN101280470A (en) * | 2007-04-02 | 2008-10-08 | 上海兰邦工业纤维有限公司 | Method for consciously producing polyacryl-nitrile dissolving pulp-like fibre |
| CN103437233A (en) * | 2013-09-11 | 2013-12-11 | 顾德芹 | Polyacrylonitrile pulp type fibers as well as preparation method thereof |
| CN203345647U (en) * | 2013-07-15 | 2013-12-18 | 福建省轻工机械设备有限公司 | Twin-wire pulp crushing and loosening screw conveyor |
-
2015
- 2015-05-19 CN CN201510257572.2A patent/CN104831397B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284247A (en) * | 1977-12-06 | 1981-08-18 | Eriksson Erik F | Apparatus for defibrating and conditioning nonflowable cellulosic material |
| US4708623A (en) * | 1983-03-14 | 1987-11-24 | Chisso Corporation | Apparatus for producing organic filler-blended resin compositions |
| CN2291435Y (en) * | 1997-04-20 | 1998-09-16 | 刘长恩 | Double-screw beating mill |
| JP2001062316A (en) * | 1999-08-26 | 2001-03-13 | Yamamoto Co Ltd | Single-screw grinding and polishing grain-milling machine |
| CN1292445A (en) * | 1999-09-24 | 2001-04-25 | 刘长恩 | Chemical mechanical pulp-making method and equipment |
| CN101280470A (en) * | 2007-04-02 | 2008-10-08 | 上海兰邦工业纤维有限公司 | Method for consciously producing polyacryl-nitrile dissolving pulp-like fibre |
| CN203345647U (en) * | 2013-07-15 | 2013-12-18 | 福建省轻工机械设备有限公司 | Twin-wire pulp crushing and loosening screw conveyor |
| CN103437233A (en) * | 2013-09-11 | 2013-12-11 | 顾德芹 | Polyacrylonitrile pulp type fibers as well as preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113502685A (en) * | 2021-06-23 | 2021-10-15 | 华南理工大学 | Polyacrylonitrile pulp, preparation method thereof and application thereof in preparation of carbon rod filter element |
| CN113502685B (en) * | 2021-06-23 | 2022-08-16 | 华南理工大学 | Polyacrylonitrile pulp, preparation method thereof and application thereof in preparation of carbon rod filter element |
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| CN104831397B (en) | 2017-06-06 |
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