CN104831397B - A kind of preparation method of acrylic fibers pulp - Google Patents

A kind of preparation method of acrylic fibers pulp Download PDF

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Publication number
CN104831397B
CN104831397B CN201510257572.2A CN201510257572A CN104831397B CN 104831397 B CN104831397 B CN 104831397B CN 201510257572 A CN201510257572 A CN 201510257572A CN 104831397 B CN104831397 B CN 104831397B
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China
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acrylic
grinding
screw
fiberizer
acrylic fibers
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CN201510257572.2A
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Chinese (zh)
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CN104831397A (en
Inventor
周惠昌
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常州市武进华东特种纤维制造有限公司
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Publication of CN104831397A publication Critical patent/CN104831397A/en
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Abstract

The present invention relates to the preparation method of acrylic fibers pulp.A kind of preparation method of acrylic fibers pulp, acrylic fibre tow fiber is prepared by electrostatic spinning technique, through prescinding, disperseing, grind, obtains acrylic fibers pulp fibers;Wherein described grinding screw formula fiberizer grinding;The screw rod that described screw fiberizer includes grinding passage and is arranged in grinding passage, thread crest is rough surface on the screw rod.Utilization screw fiberizer of the invention, is coordinated with grinding vias inner walls using the rough surface of screw flight crest and acrylic staples is ground simultaneously in acrylic staples transportation, improves operating efficiency;Secondly, more fully, uniformly, the acrylic fibers pulp fibers dendritic structure for being evenly, improves the tensile strength of material to the screw fiberizer grinding in the application;In addition, compared to disc type paste mill, the abrasion of screw fiberizer is few, improves the utilization rate of raw material, saves cost.

Description

A kind of preparation method of acrylic fibers pulp

Technical field

The present invention relates to the preparation method of acrylic fibers pulp.

Background technology

Acrylic fibers pulp is except with excellent environmental suitability, the use insensitive to humidity and higher itself having Outside temperature, also with original fiber degree it is high, dispersive property in body is good and dry, wet-milling product performance is good the characteristics of.Big absolutely Asbestos or Fanglun slurry cake can in most cases be replaced is used for the multiple fields, sexual valence such as rubbed sealing material, speciality paper, non-woven fabrics Compare high.The processing performance of compound can be improved in friction material, the intensity and wearability of product is improved, braking is reduced and made an uproar Other compound uses such as sound, it is also possible to and rockwool coating resin, flaxen fiber, for without asbestos disc brake pad, drum-type brake pad and from Clutch piece.Tensile strength and sealing property can be improved for encapsulant.

Acrylic fibers preparation technology using electrostatic spinning technique approximately as obtaining acrylic fibre tow fiber, through cutting in the prior art Cut, disperse, grinding and obtain acrylic fibers dissolving pulp-like fibre.Wherein detailed process is as follows:The acrylic fibre tow fiber of formation is prescinded, then The fiber that will be prescinded is dispersed in water to form suspension, recycles disc type (single-deck or double plate) fiberizer to be ground, finally Pulp fibers are obtained, its structure is distributed in dendroid, i.e., all have many fentos on every limb, surface hairiness is enriched very much. But wherein in cutting process, acrylic fibre tow is typically prescinded into the chopped fiber for 5~8mm, it is polished obtain 1.5~ The fiber of 2.5mm, it is seen that the chopped fiber after cleaved in the process of lapping needs further to be prescinded, weares and teares larger, and most Whole staple length wider distribution, grinding are uneven.

The content of the invention

The technical problem to be solved in the present invention is:Overcome and wear and tear larger in acrylic fibers process of lapping in the prior art, it is short and long A kind of uneven deficiency of degree wider distribution, grinding, there is provided 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, by quiet Electrospinning prepares acrylic fibre tow fiber, through prescinding, disperseing, grind, obtains acrylic fibers pulp fibers;Wherein described grinds The fiberizer grinding of mill screw;

The screw rod that described screw fiberizer includes grinding passage and is arranged in grinding passage, screw thread on the screw rod Crest is rough surface.

Further, for ease of the dispersiveness of acrylic staple fibre, the described acrylic fibre tow fiber length after prescinding is 3mm。

Preferably, for improve grinding efficiency and grinding effect, described thread crest surface be provided with array of protrusions or Groove array.

Further, it is further to improve grinding efficiency, described grinding vias inner walls are rough surface, logical using grinding Road inner wall coarse surface is engaged the grinding for carrying out acrylic staples with thread crest rough surface.

Preferably, described grinding vias inner walls are provided with array of protrusions or groove array.

Preferably, for ensure grinding effect so that acrylic staples were both fully ground, again will not overmastication cause Abrasion, distance is 10~30 μm between described thread crest and grinding vias inner walls.

Preferably, described dispersion refers to acrylic fiber after prescinding to be dispersed in water to form the outstanding of 0.5~4wt% Turbid liquid, acrylic fibers are short and are scattered in after water that concentration is too small to cause grinding efficiency low, insufficient phenomenon ground, and if concentration mistake Height, then can increase abrasion, or even cause to grind the blocking of passage.

The beneficial effects of the invention are as follows, utilization screw fiberizer of the invention, in acrylic staples transportation simultaneously Coordinated with grinding vias inner walls using the rough surface of screw flight crest and acrylic staples are ground, improve work effect Rate;Secondly, compared to ventional disc fiberizer, the screw fiberizer grinding in the application is more fully, uniformly so that acrylic fibers are starched Dregs of rice fiber dendritic structure evenly, improves the tensile strength of material;In addition, compared to disc type paste mill, screw defibrination Machine abrasion is few (after being ground to 3mm acrylic staples, acrylic fibers length is 2.7~3mm), improves the utilization rate of raw material, saves Cost.

Brief description of the drawings

The present invention is further described with reference to the accompanying drawings and examples.

Fig. 1 is screw fiberizer structural representation;

Fig. 2 is circle inner structure enlarged drawing in Fig. 1;

Fig. 3 is 600 times of SEM figures of acrylic fibers dissolving pulp-like fibre prepared by embodiment 1,

In figure:1. passage is ground, 2. screw rod, 21. thread crests, 22. array of protrusions.

Specific embodiment

Presently in connection with drawings and Examples, the present invention is further detailed explanation.These accompanying drawings are simplified signal Figure, only illustrates basic structure of the invention in a schematic way, therefore it only shows the composition relevant with the present invention.

As illustrated in fig. 1 and 2, the screw rod 2 that a kind of screw fiberizer includes grinding passage 1 and is arranged in grinding passage 1, The surface of thread crest 21 is provided with array of protrusions 22 or groove array on the screw rod 2, forms rough surface, the grinding passage 1 inwall is also equipped with being engaged rough surface with the surface of the thread crest 21, the thread crest 21 with grinding the inwall of passage 1 Between be not less than 10 μm at distance minimum, maximum is no more than 30 μm.The wherein grinding segment of passage 1 is respectively charging aperture and discharging Mouthful, acrylic staples dispersion liquid is pumped to charging aperture by pump, dispersion liquid is fed forward using the transfer capability of screw rod 2, together The surface of thread crest 21 is engaged with the grinding inner wall surface of passage 1 and acrylic staples is ground on Shi Liyong screw rods 2.

Embodiment 1

Weigh the sodium sulfocyanate that polypropylene fine condensates of the 10kg containing 7.5% methyl acrylate is dissolved in the 44% of 670kg In the aqueous solution, then weigh 90kg and be dissolved in above-mentioned solution containing the polyacrylonitrile condensate of 7.5% vinylacetate, form double groups Part co-blended spinning stoste, the solution obtains polyacrylonitrile blended fibre bundle by electrostatic spinning technique.

The fibre bundle that will be obtained is cut into the chopped fiber that length is 3mm in fibre cutting machine, weighs 50kg and is scattered in 10t water In, screw fiberizer is pumped into the flow of 3t/h, slurries obtain acrylic fibers dissolving pulp-like fibre, distribution of lengths through centrifugal drying It is 2.7~3mm, degree Schopper-Riegler is 46.2 ° of SR, and specific surface area is 31.4m2/ g, tensile strength 485MPa.

Comparative example 1

Screw fiberizer in embodiment 1 is replaced with into double disc refiner of the prior art, other conditions are constant.Finally The distribution of lengths of acrylic fibers dissolving pulp-like fibre is obtained for 1.4 ± 0.5mm, degree Schopper-Riegler is 40.3 ° of SR, specific surface area is 14.2m2/ g, tensile strength 430MPa.

Embodiment 2

Obtained polyacrylonitrile blended fibre bundle in embodiment 1 is cut into the chopped fiber that length is 3mm through cutting machine, is claimed Take 50kg to be scattered in 5t water, screw fiberizer is pumped into the flow of 3t/h, slurries obtain acrylic fibers and starch through centrifugal drying Dregs of rice shape fiber, distribution of lengths is 2.8~3mm, and degree Schopper-Riegler is 46.5 ° of SR, specific surface area 30.2m2/ g, tensile strength 480MPa。

Comparative example 2

Screw fiberizer in embodiment 1 is replaced with into single-plate paste mill of the prior art, other conditions are constant.Finally The distribution of lengths of acrylic fibers dissolving pulp-like fibre is obtained for 1.6 ± 0.4mm, degree Schopper-Riegler is 41.3 ° of SR, specific surface area is 13.5m2/ g, tensile strength 420MPa.

Embodiment 3

Obtained polyacrylonitrile blended fibre bundle in embodiment 1 is cut into the chopped fiber that length is 3mm through cutting machine, is claimed Take 50kg to be scattered in 1.25t water, screw fiberizer is pumped into the flow of 3t/h, slurries obtain acrylic fibers through centrifugal drying Dissolving pulp-like fibre, distribution of lengths is 2.7~3mm, and degree Schopper-Riegler is 46.0 ° of SR, specific surface area 30.8m2/ g, tensile strength 483MPa。

Comparative example 3

Screw fiberizer in embodiment 1 is replaced with into single-plate paste mill of the prior art, other conditions are constant.Finally The distribution of lengths of acrylic fibers dissolving pulp-like fibre is obtained for 1.2 ± 0.6mm, degree Schopper-Riegler is 43.3 ° of SR, specific surface area 14.2m2/ G, tensile strength 425MPa.

From above-mentioned comparative example and embodiment contrast it is recognized that while being only the difference of milling apparatus, but ground through ventional disc The acrylic fibers dissolving pulp-like fibre length obtained after pulp grinder grinding is caused and significantly ground compared to greatly reducing before grinding Damage, and distribution of lengths is wider, grinds uneven;In addition, the acrylic fibers pulp fibers after being ground through ventional disc fiberizer compare table Area is smaller, only the half of acrylic fibers pulp fibers specific surface area prepared by the application, illustrates the acrylic fibers slurry prepared in the application Dregs of rice shape fiber dendritic structure is more, evenly, surface hairiness it is more rich (as shown in Figure 3), while it is fine to improve acrylic fibers pulp shape The tensile strength of dimension.

Claims (3)

1. a kind of preparation method of acrylic fibers pulp, it is characterised in that:Acrylic fibre tow fiber is prepared by electrostatic spinning technique, Through prescinding, disperseing, grind, acrylic fibers pulp fibers are obtained;Wherein described grinding is ground through screw fiberizer;
Described screw fiberizer includes grinding passage (1) and the screw rod (2) being arranged in grinding passage (1), the screw rod (2) thread crest (21) is rough surface on, and described thread crest (21) surface is provided with array of protrusions (22) or groove battle array Row;Described grinding passage (1) inwall be rough surface, described grinding passage (1) inwall be provided with array of protrusions (22) or Groove array;
Distance is 10~30 μm between described thread crest (21) and grinding passage (1) inwall.
2. the preparation method of acrylic fibers pulp according to claim 1, it is characterised in that:Described acrylic fibre tow fiber is through cutting Short rear length is 3mm.
3. the preparation method of acrylic fibers pulp according to claim 1, it is characterised in that:Described dispersion refers to after prescinding Acrylic fiber be dispersed in water the suspension to form 0.5~4wt%.
CN201510257572.2A 2015-05-19 2015-05-19 A kind of preparation method of acrylic fibers pulp CN104831397B (en)

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Application Number Priority Date Filing Date Title
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CN104831397B true CN104831397B (en) 2017-06-06

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE408920B (en) * 1977-12-06 1979-07-16 Mo Och Domsjoe Ab Apparatus for defibrating and conditioning cellulosic materials
JPS6257491B2 (en) * 1983-03-14 1987-12-01 Chisso Corp
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
CN1091820C (en) * 1999-09-24 2002-10-02 刘长恩 Chemical mechanical pump-making method and equipment
CN101280470B (en) * 2007-04-02 2012-04-25 上海兰邦工业纤维有限公司 Method for continuously producing polyacryl-nitrile 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
CN103437233B (en) * 2013-09-11 2016-10-05 顾德芹 A kind of polyacryl-nitrile dissolving pulp-like fibre and preparation method thereof

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