CN102605448A - Intermittent drafting process of melt spun polyvinyl alcohol fiber - Google Patents
Intermittent drafting process of melt spun polyvinyl alcohol fiber Download PDFInfo
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- CN102605448A CN102605448A CN201210078786XA CN201210078786A CN102605448A CN 102605448 A CN102605448 A CN 102605448A CN 201210078786X A CN201210078786X A CN 201210078786XA CN 201210078786 A CN201210078786 A CN 201210078786A CN 102605448 A CN102605448 A CN 102605448A
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Abstract
The invention relates to an intermittent drafting process of melt spun polyvinyl alcohol fiber, namely carrying out three-level drafting to the polyvinyl alcohol fiber whose water content is 5 to 10% obtained by drying in melt spun process. The total draft multiple is 5 to 25-fold. After the first-stage and the second-stage drafting process, the first-stage and second-stage drying hot boxes with certain temperature and moisture content are respectively accessed; the third-stage drafting is carried out in the dry hot air under certain temperature. The strength of polyvinyl alcohol fiber obtained by the third-stage drafting is not smaller than 8 cN/dtex and the modulus is not smaller than 25GPa. The method provided by the invention controls the drafting process of the polyvinyl alcohol fiber spinning by controlling the evaporation of water content in the polyvinyl alcohol fiber to obtain the high-performance polyvinyl alcohol fiber. The process technique of the method is simple and the additive is not added. The solvent does not need to be recycled and processed. The environment pollution is small and the production cost is low. The intermittent drafting process of melt spun polyvinyl alcohol fiber can be widely applied to the fields such as the civil engineering and armor protection material.
Description
Technical field
The present invention relates to a kind of draft process of vinal; Be particularly related to a kind of batch (-type) draft process of vinal of melt spinning, specifically a kind of evaporation of controlling water content in the vinal through access dried heat case apparatus is to produce the draft process of high performance polyvinyl alcohel fiber.
Background technology
Shortcomings such as concrete tensile property is poor in order to improve, performance of resisting cracking and ductility difference to improve the research of concrete performance, develop quite rapidly to admixture synthetic fiber in concrete.The polyvinyl alcohol high-performance fiber has intensity height, good in thermal property, the excellent and compatibility good of weather fastness with cement concrete, and reinforced effects is obvious.But the polyhydroxy strong hydrogen bonding characteristic of polyvinyl alcohol makes its fusing point and decomposition temperature approaching, is difficult to thermoplastic processing, and drafting multiple is difficult to improve, and performances such as the intensity of fiber and modulus are difficult to assurance.
In order to solve the variety of problems that the polyvinyl alcohol spinning occurs; Improve the intensity and the modulus of vinal; Made big quantity research both at home and abroad: like the aftertreatment technology of mentioning among the patent CN101314871A with entering level Four drawing-off behind the gel fiber process three-stage drying; But before this technology, need carry out the washing stage of preliminary draft and fiber, and need the negative-pressure vacuum extraction solvent; And for example patent CN1197858A adopts damp and hot and dry heat drafting, has the advantages that to adopt two coagulating baths to form the as-spun fibre of even structure, but is difficult to obtain the as-spun fibre of circular cross-section.So, there are shortcomings such as complex procedures and high energy consumption in the spinning drafting process of vinal in the prior art.
The research of a kind of melt-spun method high strength high modulus polyvinyl alcohol fiber structure and performance (Li Li Sichuan University doctorate paper) is though studied structure and the Effect on Performance of water content to vinal in the drafting process of vinal; But this paper can only be explained water content and drop to the orientation of 5% o'clock fiber and the variation of crystal property from 35%, and can not draw the conclusion that the more little polyvinyl alcohol oriented crystalline of water content structure is perfect more, mechanical property is high more.This paper is not considered the influence that the evaporation of water counter extensioin is brought in the vinal in addition, the evaporation of water problem is not regulated control yet.
In the aftertreatment technology of fiber, the content of water plays a part to closing the vinal Effect on Performance in the drafting process.When the content of water is too much in the polyvinyl alcohol as-spun fibre on the one hand; Then can make in the hot drafting process of fiber because of water evaporation causing component dynamic change; Produce bubble when violent; Cause the vinal surface hole to occur, make that fiber surface is inhomogeneous, rough, crack etc., and the drawing-off of fiber is exerted an influence.In drafting process, water can be used as a kind of plasticizer on the other hand, weakens the intermolecular and intramolecular hydrogen bond of polyvinyl alcohol, and lubricate makes macromolecular chain keep the higher state of unfolding, and promotes the drawing-off of fiber.The vinal moisture crosses when low then that fiber does not reach high drafting multiple, and corresponding strength and modulus neither be very high.Therefore the water content in the controlling fiber can prevent that not only fiber from producing bubble in drafting process, also can promote the drawing-off of fiber through the plasticization that remains in the water in the fiber, the fiber that obtained performance is excellent.
Yet above-mentioned prior art after the spinning of vinal in the processed not to fiber in the evaporation of water phenomenon take in and control.
Summary of the invention
The technical problem that the present invention will solve is that the evaporation of the moisture in the vinal is regulated and controlled to a kind of dried heat case of access in the drafting process of vinal, obtains the method for high performance vinal.The key of this method is to control the evaporation of moisture in the fiber in the drafting process through the water capacity in the control dried heat case, thereby improves the performance of vinal.The production technology of this method is simple, only just can improve the surface property and the mechanical property of vinal through simple operation, need not other solvent additive, need not the taking back and process of solvent, and environmental pollution is little, and production cost is low.Adopt the vinal of this method preparation to have advantages such as high strength, high-modulus, can be widely used in fields such as civil engineering, architectural engineering and armor facing material.
In order to solve the weak point that exists in the prior art, the present invention takes following technical scheme:
The invention provides a kind of draft process of melt-spun vinal, is to be 5～10% vinal with the moisture that obtains after the drying in the melt-spun process, carries out three grades of drawing-offs, and the total draft multiple is 5～25:
(1) first order drawing-off: the drawing temperature in the first road drafting heat box is controlled at 90～99 ℃, and drafting multiple is 3～5;
(2) first order dried heat case: the water capacity in the first road dried heat case also is the quality of institute's moisture vapor in the dry air of unit mass, is 2～4%, and temperature is controlled at 10～20 ℃, and the moisture of exit vinal is 3～6%;
(3) second level drawing-off: the drawing temperature in the second road drafting heat box is controlled at 120～140 ℃, and drafting multiple is 1.4～2.5;
(4) second level dried heat case: the water capacity in the second road dried heat case is 1～2%, and temperature is controlled at 20～30 ℃, and the moisture of exit vinal is 1～3%;
(5) third level drawing-off: in heated dry air, carry out drawing-off, the temperature of drawing-off is controlled at 200～220 ℃, and through third level drawing-off, drafting multiple is 1.2～2.
Through after three grades of drawing-offs, the total draft multiple of vinal is 5～25, the fracture strength >=8cN/dtex of the vinal that obtains, modulus >=25GPa as stated.
The batch (-type) draft process of aforesaid a kind of melt-spun vinal, described drawing-off are to adopt seven roller drawing machines.
Thereby in drafting process, can control the draft process of the evaporation control vinal of moisture in the vinal thus through inserting the dried heat case apparatus.
Beneficial effect:
The moisture that the present invention controls the evaporation of moisture in the vinal and then controls fiber in the drafting process through the device that inserts the dried heat case has the following advantages to prepare high performance vinal:
Come the moisture of controlling fiber just can carry out spinning and high drafting that plasticising realizes polyvinyl alcohol through the device that inserts the dried heat case, need not ultra-high molecular weight polyethylene alcohol, do not need coagulating bath; Need not to add other additives; Only need to control the evaporation of moisture in the vinal, make vinal after too much times of drawing-off and the nervous HEAT SETTING of high temperature, just can obtain high performance fiber through the water capacity in the regulation and control dried heat case; Remedy the defective of prior art and commercially available prod; Satisfy needs such as high-performance fiber field, and technology is simple, economy, environmental protection, is easy to realize suitability for industrialized production.
The specific embodiment
Below in conjunction with the specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
With moisture is 5% vinal, carries out three grades of drawing-offs.In the first road drafting heat box, carry out first order drawing-off, temperature is controlled at 90 ℃, and drafting multiple is 3.Water capacity in the first order dried heat case is 2%, and temperature is controlled at 10 ℃, and the moisture of dried heat case exit vinal is 3%.In the second road drafting heat box, carry out second level drawing-off, temperature is controlled at 120 ℃, and drafting multiple is 1.4.Water capacity in the dried heat case of the second level is 1%, and temperature is controlled at 20 ℃, and the moisture of dried heat case exit vinal is 1%.In heated dry air, carry out third level drawing-off, temperature is controlled at 200 ℃, and after third level drawing-off, drafting multiple is 1.2.
Through after three grades of drawing-offs, the fracture strength of the vinal that obtains is 8cN/dtex as stated, and modulus is 25GPa.
Embodiment 2
With moisture is 7.5% vinal, carries out three grades of drawing-offs.In the first road drafting heat box, carry out first order drawing-off, temperature is controlled at 94.5 ℃, and drafting multiple is 4.Water capacity in the first order dried heat case is 3%, and temperature is controlled at 15 ℃, and the moisture of dried heat case exit vinal is 4.5%.In the second road drafting heat box, carry out second level drawing-off, temperature is controlled at 130 ℃, and drafting multiple is 1.95.Water capacity in the dried heat case of the second level is 1.5%, and temperature is controlled at 25 ℃, and the moisture of dried heat case exit vinal is 2%.In heated dry air, carry out third level drawing-off, temperature is controlled at 210 ℃, and after third level drawing-off, drafting multiple is 1.6.
Through after three grades of drawing-offs, the fracture strength of the vinal that obtains is 11cN/dtex as stated, and modulus is 28GPa.
Described drawing-off is to adopt seven roller drawing machines.
Embodiment 3
With moisture is 10% vinal, carries out three grades of drawing-offs.In the first road drafting heat box, carry out first order drawing-off, temperature is controlled at 99 ℃, and drafting multiple is 5.Water capacity in the first order dried heat case is 4%, and temperature is controlled at 20 ℃, and the moisture of dried heat case exit vinal is 6%.In the second road drafting heat box, carry out second level drawing-off, temperature is controlled at 140 ℃, and drafting multiple is 2.5.Water capacity in the dried heat case of the second level is 2%, and temperature is controlled at 30 ℃, and the moisture of dried heat case exit vinal is 3%.In heated dry air, carry out third level drawing-off, temperature is controlled at 220 ℃, and after third level drawing-off, drafting multiple is 2.
Through after three grades of drawing-offs, the fracture strength of the vinal that obtains is 14cN/dtex as stated, and modulus is 31GPa.
Described drawing-off is to adopt seven roller drawing machines.
Embodiment 4
With moisture is 6.25% vinal, carries out three grades of drawing-offs.In the first road drafting heat box, carry out first order drawing-off, temperature is controlled at 92.25 ℃, and drafting multiple is 3.5.Water capacity in the first order dried heat case is 2.5%, and temperature is controlled at 12.5 ℃, and the moisture of dried heat case exit vinal is 3.75%.In the second road drafting heat box, carry out second level drawing-off, temperature is controlled at 125 ℃, and drafting multiple is 1.675.Water capacity in the dried heat case of the second level is 1.25%, and temperature is controlled at 22.5 ℃, and the moisture of dried heat case exit vinal is 1.5%.In heated dry air, carry out third level drawing-off, temperature is controlled at 205 ℃, and after third level drawing-off, drafting multiple is 1.4.
Through after three grades of drawing-offs, the fracture strength of the vinal that obtains is 9.5cN/dtex as stated, and modulus is 26.5GPa.
Embodiment 5
With moisture is 8.75% vinal, carries out three grades of drawing-offs.In the first road drafting heat box, carry out first order drawing-off, temperature is controlled at 96.75 ℃, and drafting multiple is 4.5.Water capacity in the first order dried heat case is 3.5%, and temperature is controlled at 17.5 ℃, and the moisture of dried heat case exit vinal is 5.25%.In the second road drafting heat box, carry out second level drawing-off, temperature is controlled at 135 ℃, and drafting multiple is 2.225.Water capacity in the dried heat case of the second level is 1.75%, and temperature is controlled at 27.5 ℃, and the moisture of dried heat case exit vinal is 2.5%.In heated dry air, carry out third level drawing-off, temperature is controlled at 215 ℃, and after third level drawing-off, drafting multiple is 1.8.
Through after three grades of drawing-offs, the fracture strength of the vinal that obtains is 12.5cN/dtex as stated, and modulus is 29.5GPa.
Described drawing-off is to adopt seven roller drawing machines.
Claims (2)
1. the batch (-type) draft process of a melt-spun vinal is characterized in that:
With the moisture that obtains after the drying in the melt-spun process is 5～10% vinal, carries out three grades of drawing-offs, and it is dry between three grades of drawing-offs, to insert two-stage, and the total draft multiple is 5～25:
(1) first order drawing-off: drawing temperature is controlled at 90～99 ℃, and drafting multiple is 3～5;
(2) first order dried heat case: the water capacity in the first road dried heat case is 2～4%, and temperature is controlled at 10～20 ℃, and the moisture of exit vinal is 3～6%;
(3) second level drawing-off: drawing temperature is controlled at 120～140 ℃, and drafting multiple is 1.4～2.5;
(4) second level dried heat case: the water capacity in the second road dried heat case is 1～2%, and temperature is controlled at 20～30 ℃, and the moisture of exit vinal is 1～3%;
(5) third level drawing-off: in heated dry air, carry out drawing-off, drawing temperature is controlled at 200～220 ℃, and drafting multiple is 1.2～2.Fracture strength >=the 8cN/dtex of the vinal that obtains after the drawing-off of the process third level, modulus >=25GPa.
2. the batch (-type) draft process of a kind of melt-spun vinal according to claim 1 is characterized in that, described drawing-off is to adopt seven roller drawing machines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210078786.XA CN102605448B (en) | 2012-03-22 | 2012-03-22 | Intermittent drafting process of melt spun polyvinyl alcohol fiber |
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| CN201210078786.XA CN102605448B (en) | 2012-03-22 | 2012-03-22 | Intermittent drafting process of melt spun polyvinyl alcohol fiber |
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| CN102605448A true CN102605448A (en) | 2012-07-25 |
| CN102605448B CN102605448B (en) | 2015-04-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680349A (en) * | 2018-12-25 | 2019-04-26 | 南通新帝克单丝科技股份有限公司 | Composite spinning squeezes out unit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786302A (en) * | 2005-12-13 | 2006-06-14 | 中国石化集团四川维尼纶厂 | Method of preparing high performance polyvinyl alcohel fiber |
| CN1804156A (en) * | 2006-01-17 | 2006-07-19 | 中国石化集团四川维尼纶厂 | Process and apparatus for manufacturing vinylon filament |
| CN101899722A (en) * | 2009-05-25 | 2010-12-01 | 上海启鹏化工有限公司 | Preparation method for polyvinyl alcohol coarse denier monofilaments |
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2012
- 2012-03-22 CN CN201210078786.XA patent/CN102605448B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786302A (en) * | 2005-12-13 | 2006-06-14 | 中国石化集团四川维尼纶厂 | Method of preparing high performance polyvinyl alcohel fiber |
| CN1804156A (en) * | 2006-01-17 | 2006-07-19 | 中国石化集团四川维尼纶厂 | Process and apparatus for manufacturing vinylon filament |
| CN101899722A (en) * | 2009-05-25 | 2010-12-01 | 上海启鹏化工有限公司 | Preparation method for polyvinyl alcohol coarse denier monofilaments |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680349A (en) * | 2018-12-25 | 2019-04-26 | 南通新帝克单丝科技股份有限公司 | Composite spinning squeezes out unit |
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