CN113249808B - Winding forming method of polyacrylonitrile-based protofilament - Google Patents
Winding forming method of polyacrylonitrile-based protofilament Download PDFInfo
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- CN113249808B CN113249808B CN202110413025.4A CN202110413025A CN113249808B CN 113249808 B CN113249808 B CN 113249808B CN 202110413025 A CN202110413025 A CN 202110413025A CN 113249808 B CN113249808 B CN 113249808B
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Abstract
The invention relates to a winding and forming method of polyacrylonitrile-based protofilament, which mainly adopts the technical scheme that: a winding forming method of polyacrylonitrile-based protofilament comprises the steps of winding and forming the polyacrylonitrile-based protofilament through a filament receiving machine, wherein the initial tension applied to the polyacrylonitrile-based protofilament by the filament receiving machine is set to be 80-1500 cN; in the winding forming process: along with the increase of the winding diameter, the tension applied to the polyacrylonitrile-based precursor by the filament winding machine is reduced in a linear proportion; setting the initial contact pressure applied by the filament collecting machine to the polyacrylonitrile-based protofilament to be 50-200N; in the winding and forming process, along with the increase of the winding diameter, the contact pressure applied by the filament collecting machine to the polyacrylonitrile-based protofilament is reduced in a linear proportion; and setting the winding ratios to 1-15 groups, wherein each group of winding ratios corresponds to different ranges of winding diameters, and the value of the winding ratio of the next group is smaller than that of the previous group. The method is mainly used for improving the winding and forming effects of the polyacrylonitrile-based protofilament by controlling the parameters of the filament collecting machine in the protofilament winding process.
Description
Technical Field
The invention relates to the technical field of polyacrylonitrile-based carbon fibers, in particular to a winding and forming method of polyacrylonitrile-based protofilaments.
Background
The winding and forming process of polyacrylonitrile-based precursor (hereinafter referred to as precursor) is one of the important processes in the production and preparation process of polyacrylonitrile-based carbon fibers. The winding forming process mainly has the function of winding the precursor into a long cylindrical fiber shaft product with a certain length, and further carrying out subsequent carbon fiber preparation or packaging, storage, sale and the like. The requirements of the winding forming process are as follows: the raw silk can not be damaged in the winding and forming process, and the winding and forming are good, the side surface of the end face is smooth, and the tightness is moderate. If the winding forming is not good, the phenomenon of difficult unwinding can occur in the subsequent unwinding process, broken filaments and broken filaments are easily generated by forced unwinding, and the quality of the carbon fibers is influenced. Meanwhile, if the winding forming is not good, the packaging and storage of the protofilament are not facilitated.
At present, the winding forming effect of the protofilament is mainly realized by controlling the parameters of a filament receiving machine such as tension, clamping ring roller contact pressure (hereinafter, referred to as contact pressure) and winding ratio; while different specification strands need to be designed to match different parameters.
Aiming at different specifications of precursor fibers, how to set parameters of the fiber collecting machine enables the winding forming effect of the precursor fibers to be excellent, and the method has great significance for the production of carbon fibers, but no relevant research and report exists at present.
Disclosure of Invention
In view of the above, the invention provides a winding forming method of polyacrylonitrile-based precursor, and mainly aims to improve the winding forming effect of polyacrylonitrile-based precursor by controlling parameters of a filament receiving machine in the precursor winding process.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a winding forming method of polyacrylonitrile-based protofilament, which winds and forms the polyacrylonitrile-based protofilament by a filament receiving machine, wherein,
setting the initial tension applied to the polyacrylonitrile-based precursor by the filament receiving machine to be 80-1500 cN; in the winding and forming process, the tension applied to the polyacrylonitrile-based precursor by the filament winding machine is reduced in a linear proportion along with the increase of the roll diameter (the term "in a linear proportion" in the present application specifically means that the roll diameter is used as an abscissa and the tension is used as an ordinate, and the tension is reduced and linearly reduced along with the increase of the roll diameter);
setting the initial contact pressure applied to the polyacrylonitrile-based precursor by the filament collecting machine to be 50-200N; in the winding and forming process, along with the increase of the winding diameter, the contact pressure applied to the polyacrylonitrile-based precursor by the filament winding machine is reduced in a linear proportion (the linear proportion is explained above);
setting the winding ratio to 1-15 groups; when the winding ratios are set to be at least two groups, each group of winding ratios corresponds to the winding diameters in different ranges, and the value of the winding ratio of the next group is smaller than that of the previous group.
Preferably, if the polyacrylonitrile-based filament is any one of 1K polyacrylonitrile-based filament, 3K polyacrylonitrile-based filament and 6K polyacrylonitrile-based filament, the initial tension applied to the polyacrylonitrile-based filament by the filament winder is set to 80 to 500 cN; preferably, if the polyacrylonitrile-based precursor is 1K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament winder is set to be 80 to 180 cN; preferably, if the polyacrylonitrile-based precursor is 3K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament receiving machine is set to be 120-220 cN; preferably, if the polyacrylonitrile-based precursor is 6K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament winder is set to be 260-;
if the polyacrylonitrile-based precursor is 12K polyacrylonitrile-based precursor, setting the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine to be 400-700cN, preferably 500-600 cN;
if the polyacrylonitrile-based precursor is 24K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament winding machine is set to 600-900cN, preferably 700-800 cN.
Preferably, when the winding is finished, the tension F applied to the polyacrylonitrile-based precursor by the filament winding machine 11 (ii) a Wherein, F 11 ＝F 10 (1-. lamda.1); wherein, F 10 Is an initial tension; λ 1 is a tension reduction ratio, and λ 1 is 90% or less.
Preferably, when the polyacrylonitrile-based precursor is any one of 1K polyacrylonitrile-based precursor, 3K polyacrylonitrile-based precursor and 6K polyacrylonitrile-based precursor, λ 1 is 30 to 70%; if the polyacrylonitrile-based precursor is 12K polyacrylonitrile-based precursor or 24K polyacrylonitrile-based precursor, the lambda 1 is 70-90%.
Preferably, the initial contact pressure of the filament winder on the polyacrylonitrile-based filament is set to 70 to 130N.
Preferably, when the winding is finished, the yarn collecting machine collects the yarnContact pressure F exerted by acrylonitrile-based precursor 21 (ii) a Wherein, F 21 ＝F 20 (1-. lambda.2); wherein, F 20 Initial contact pressure; λ 2 is a contact pressure reduction ratio, and λ 2 is 90% or less.
Preferably, when the polyacrylonitrile-based precursor is any one of 1K, 3K and 6K, λ 2 is 40% or less; if the polyacrylonitrile-based filament is 12K or 24K, the lambda 2 is 50-90%.
Preferably, the winding ratio value is set within the range of 1.00-10.00; and/or
The difference value of the roll diameters corresponding to the two adjacent groups of winding ratios is roll diameter interval, wherein the roll diameter interval is 0-50mm, and preferably 0-30 mm; and/or
The winding ratio value difference of two adjacent groups is more than 0 and less than or equal to 2.00.
Preferably, when the polyacrylonitrile-based precursor is any one of 1K, 3K and 6K, the difference of the winding ratio values of two adjacent groups is 0.10-0.50, and the winding diameter interval is 20-30 mm; if the polyacrylonitrile-based precursor fiber is 12K or 24K, the difference between the winding ratio values of two adjacent groups is 0.30-0.80, and the winding diameter interval is 0-20 mm.
Preferably, the polyacrylonitrile-based raw silk roll obtained after winding and forming has a first end face and a second end face, and the distance between the first end face and the paper roll end and the distance between the second end face and the paper roll end are 10-50mm, preferably 15-30 mm; and/or the filament pitch of the polyacrylonitrile-based filament roll obtained after winding and forming is larger than the diameter of the polyacrylonitrile-based filament, and the difference is 0.1-10.0mm, preferably 0.5-1.0 mm.
Compared with the prior art, the winding and forming method of the polyacrylonitrile-based protofilament at least has the following beneficial effects:
according to the winding forming method of the polyacrylonitrile-based precursor, the parameters of the filament winding machine, such as tension, contact pressure and winding ratio, are set during winding forming, and the parameters of the filament winding machine are matched with the winding diameter, preferably, the winding parameters matched with precursors of different specifications are also determined; under the combined action of the above setting, the polyacrylonitrile-based precursor is well formed by winding, the end surface and the side surface of the polyacrylonitrile-based precursor are flat, compact and smooth, no single filament is blown out, no stacked filament exists, the filament space is greater than the diameter of the precursor, the subsequent use or packaging, storage, sale and the like are facilitated, the problems of filament breakage and broken filament caused by difficult unwinding are avoided, and meanwhile, effective data support on site is provided for the design of a filament collecting machine.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a yarn receiving machine;
FIG. 2 is a schematic view of the fiber axis of a wound polyacrylonitrile precursor fiber;
FIG. 3 is a schematic illustration of the inter-filament spacing of polyacrylonitrile-based filaments;
FIG. 4A is a photograph of a roll of T300-1k polyacrylonitrile-based raw silk obtained after winding molding in example 1;
FIG. 4B is an enlarged view of FIG. 4A;
FIG. 5A is a photograph of a T800-12k polyacrylonitrile-based coil of filament obtained after winding formation of example 3;
FIG. 5B is an enlarged view of FIG. 5A;
FIG. 6 is a picture of a T300-1k polyacrylonitrile-based raw filament coil obtained after prior art winding formation;
FIG. 7 is a photograph of a prior art roll of T800-12k polyacrylonitrile-based raw silk after being wound and formed;
FIG. 8 is a photograph of a polyacrylonitrile-based raw silk roll with abnormal patterns obtained after winding and forming in the prior art;
FIG. 9 is a photograph of a polyacrylonitrile-based raw silk roll with uneven end surface obtained after winding and forming in the prior art;
FIG. 10 is a photograph of a saddle-shaped polyacrylonitrile-based raw filament roll obtained after winding molding in the prior art.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The term "polyacrylonitrile-based precursor" referred to in the present invention is simply referred to as "precursor", and refers to a polyacrylonitrile fiber used for producing polyacrylonitrile-based carbon fibers.
The term "contact pressure" as referred to in the present invention refers to the collar roller contact pressure, abbreviated as "contact pressure".
The winding and forming process of the polyacrylonitrile-based protofilament has the following requirements: the raw silk can not be damaged in the winding and forming process, and the winding and forming are good, the side surface of the end face is smooth, and the tightness is moderate. At present, the winding forming effect of the polyacrylonitrile-based protofilament is mainly realized by controlling the parameters of a filament receiving machine such as tension, contact pressure, winding ratio and the like, and different parameters need to be designed and matched for producing protofilaments with different specifications. But at present, no relevant report is found on the accurate design of the parameters of the filament collecting machine. Therefore, the invention designs a raw filament winding method to prepare the wound and formed raw filament (the end surface and the side surface of the raw filament are flat, compact and smooth, no monofilament floats out, no stacked filament exists, the filament spacing is larger than the diameter of the raw filament), the raw filament is convenient to withdraw and use, and meanwhile, effective data support is provided for the design of a filament collecting machine. The method is particularly important for setting the parameters of the filament collecting machine matched with different specifications of precursor filaments, and has great significance for carbon fiber production.
As shown in fig. 1, the yarn receiving machine mainly includes a tension arm 1, three godet rollers 2, and a pressing device (collar roller) 4. Wherein, the pressure equipment that connects 4 mainly applys contact pressure to coiling precursor 5, godet 2 carries out the seal wire to operation precursor 3, and tension arm 1 is connected (two godet are fixed in addition) with one godet 2 in three godet 2, and tension arm 1 swings in certain range, drives the godet swing rather than being connected, and then the control is to the tension that the operation precursor 3 applyed.
The design idea of the invention is as follows: the polyacrylonitrile-based protofilament is formed by winding through a filament winding machine, and parameters of the filament winding machine are controlled: tension (initial tension, and as the roll diameter increases, the tension decreases in linear proportion), contact pressure (initial contact pressure, and as the roll diameter increases, the contact pressure decreases in linear proportion), and winding ratio (the number of winding ratio groups, as the roll diameter increases, the number of winding ratio values in each group decreases in sequence); furthermore, different filament collecting machine parameters need to be matched and set for producing polyacrylonitrile-based protofilaments with different K numbers.
The setting of the parameters of the take-up machine enables the tows to freely and stably run and take up the tows, the phenomena of tight and loose tows caused by unreasonable tension and compression setting are avoided, the phenomenon of hair losing caused by over-traction of the tows or drooping caused by over-small tension and the like is avoided, and the phenomena of abnormal patterns (see figure 8), collapsed edges, uneven end surface side surfaces (see figure 9), saddle-shaped shapes and the like (see figure 10) caused by unmatched parameters are avoided. Referring to fig. 2, the first end surface 6 (upper end surface), the second end surface 7 (lower end surface) and the side surface 8 of the raw silk roll collected by the method of the present invention are flat, compact and smooth, no monofilament floats out, no overlapping silk exists, and the silk spacing (referring to fig. 3, the silk spacing refers to the center distance between two adjacent silk bundles) is larger than the diameter of the raw silk, so that carbonization and unwinding are facilitated. Specifically, the scheme of the invention is as follows:
the invention provides a winding forming method of polyacrylonitrile-based protofilament, which is characterized in that the winding forming is carried out on the polyacrylonitrile-based protofilament by a filament winding machine, wherein in the whole winding forming process, the parameters of the filament winding machine are as follows: the tension, contact pressure, and winding ratio were set simultaneously as follows:
tension force: setting the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine to be 80-1500 cN; in the winding forming process: the tension applied to the polyacrylonitrile-based precursor decreases in a linear proportion as the winding diameter increases, and the tension decrease rate is set to 90% or less.
Wherein, the initial tension applied to 1K, 3K and 6K polyacrylonitrile-based protofilaments by the filament receiving machine is set to be 80-500 cN. And setting the initial tension applied to the 1K polyacrylonitrile-based precursor by the filament collecting machine to be 80-180 cN. And setting the initial tension applied to the 3K polyacrylonitrile-based protofilament by the filament receiving machine to be 120-220 cN. The initial tension applied to the polyacrylonitrile-based precursor fiber of 6K by the filament winding machine is set to be 260-360 cN. Wherein, the initial tension applied by the filament collecting machine to the 12K polyacrylonitrile-based protofilament is set to be 400-700cN, preferably 500-600 cN. Wherein, the initial tension applied by the filament collecting machine to the polyacrylonitrile-based precursor filament of 24K is set to be 600-900cN, preferably 700-800 cN.
Wherein, when the winding is finished, the tension F applied to the polyacrylonitrile-based protofilament by the filament winding machine 11 ＝F 10 (1-. lambda.1); wherein, F 10 Is an initial tension; λ 1 is a tension reduction ratio, and λ 1 is 90% or less. If the polyacrylonitrile-based precursor is any one of 1K, 3K and 6K, the lambda 1 is 30-70%; if the polyacrylonitrile-based filament is 12K or 24K, the lambda 1 is 70-90%.
Contact pressure (contact pressure): the initial contact pressure applied by the filament collecting machine to the polyacrylonitrile-based protofilament is 50-200N, preferably 70-130N; in the winding and forming process, along with the increase of the roll diameter, the contact pressure applied to the polyacrylonitrile-based protofilament is reduced in a linear proportion.
Wherein, when the winding is finished, the contact pressure F exerted by the polyacrylonitrile-based precursor of the filament receiving machine 21 ＝F 20 (1-. lamda.2); wherein, F 20 Initial contact pressure; λ 2 is a contact pressure reduction ratio, and λ 2 is 90% or less. If the polyacrylonitrile-based precursor is any one of 1K, 3K and 6K, the lambda 2 is less than or equal to 40 percent; if the polyacrylonitrile-based filament is 12K or 24K, the lambda 2 is 50-90%.
The winding ratio is as follows: in the winding forming process, the winding ratios are set to be 1-15 groups, wherein when the winding ratios are set to be at least two groups, each group of winding ratios corresponds to different ranges of winding diameters, and the value of the winding ratio of the next group is smaller than that of the previous group. Wherein, the setting range of the winding ratio value is 1.00-10.00; the difference value of the roll diameters corresponding to the two adjacent groups of winding ratios is roll diameter interval, wherein the roll diameter interval is 0-50mm, and preferably 0-30 mm; the winding ratio value difference of two adjacent groups is more than 0 and less than or equal to 2.00. Wherein, if the polyacrylonitrile-based precursor is any one of 1K, 3K and 6K, the difference of the winding ratio values of two adjacent groups is 0.10-0.50, and the winding diameter interval is 20-30 mm; if the polyacrylonitrile-based precursor is 12K or 24K, the difference between the winding ratio values of two adjacent groups is 0.30-0.80, and the winding diameter interval is 0-20 mm.
Specifically, the winding ratios may be divided into 1-15 groups, including winding ratios of 1-15. The linear density of polyacrylonitrile-based precursor fibers with different specifications is different, and the winding length (namely, the fixed length) of the precursor fibers is different according to the production requirement of carbon fibers, so that the winding diameter of the fixed-length precursor fibers is different. Different winding ratio groups can be selected according to the winding diameter of the fixed-length protofilament. Each group of winding ratio corresponds to different winding diameters, and the value of each group of winding ratio is gradually decreased along with the increasing of the winding diameter. When the coil diameter is 0-d 1 When the winding diameter is d, the winding ratio is 1 1 -d 2 When the diameter of the coil is d, corresponding to the winding ratio of 2, and so on 14 -d 15 This corresponds to a winding ratio of 15. The winding ratio value range is 1.00-10.00. Wherein d is 1 ＝d 0 +N，d 0 Denotes the initial diameter of the coil, i.e., the diameter of the coil in mm when the strand is not wound, and N denotes the interval between the diameters of the coils, and is generally 0 to 50 mm. d 10 The diameter of the fixed-length precursor is more than or equal to mm. Preferably, the difference between the winding ratios of two adjacent stages is 0 to 2.00. The coil diameter interval is 0-30 mm. More preferably, the winding ratio difference of two adjacent stages of 1k, 3k and 6k protofilaments is 0.10-0.50, the winding diameter interval is 20-30mm, the winding ratio difference of two adjacent stages of 12k and 24k protofilaments is 0.30-0.80, and the winding diameter interval is 0-20 mm.
The polyacrylonitrile-based raw silk roll obtained by winding and forming by the method has flat first end face (upper end face), second end face (lower end face) and side face. The first end surface, the second end surface and the paper roll end are at a distance of 10-50mm (see fig. 2, the first end surface 7 and the paper roll end 9 are at a distance of 10-50mm), preferably 15-30 mm; the filament pitch of the polyacrylonitrile-based raw filament roll obtained after winding and forming is larger than the diameter of the polyacrylonitrile-based raw filament, and the difference value is 0.1-10.0mm, preferably 0.5-1.0 mm.
In conclusion, the invention provides a winding forming method of polyacrylonitrile-based precursor, which enables tows to freely and stably run and receive yarns under the synergistic action of the initial tension, the tension reduction proportion, the contact pressure reduction proportion and the winding ratio of a yarn receiving machine, avoids the phenomena of tight and loose tows caused by unreasonable tension and pressure receiving setting, and avoids the phenomenon of hair losing caused by over-traction of the tows or the phenomenon of tension and the like caused by over-small tension.
The invention is further illustrated below by means of specific experimental examples:
example 1
Referring to fig. 1-3, in the embodiment, a filament winding machine is used for winding and forming T300-1k polyacrylonitrile-based precursor filaments, and the fixed-length precursor filaments are 100 km; wherein, receive silk machine parameter setting as follows: an initial tension was set to 150cN, a tension reduction ratio λ 1 was set to 40%, an initial contact pressure was set to 100N, and a contact pressure reduction ratio λ 2 was set to 30%; the winding ratio is set to 6 groups, the values of the winding ratio groups 1-6 are respectively set to 5.20, 5.00, 4.80, 4.60, 4.40 and 4.20, and the winding diameters of the corresponding protofilaments are respectively 0-170mm, 190mm of 170-.
After the specific implementation, the polyacrylonitrile-based raw filament coil obtained after the winding and forming in this embodiment is shown in fig. 4A and 4B; the filament pitch of the polyacrylonitrile-based raw filament roll obtained after winding and forming is larger than 0.5mm of the diameter of the raw filament, and the distance between the upper end face and the lower end face of the polyacrylonitrile-based raw filament roll is 15mm from the end of a paper roll. As is apparent from fig. 4A and 4B: the polyacrylonitrile-based raw silk roll has the advantages of flat, compact and smooth upper end surface, lower end surface and side surface, no single silk floating, no silk overlapping, convenient packaging and storage, convenient backing-off by carbonization, and no broken silk or broken silk in the backing-off process.
FIG. 6 is a picture of a T300-1k polyacrylonitrile-based raw filament coil obtained after winding and forming in the prior art, and it is obvious that the filament spacing is extremely small and the yarn overlapping is serious, so that the filament bundle is easy to fluff during carbonization and unwinding.
Example 2
Referring to fig. 1-3, in the embodiment, a filament collecting machine is used for winding and forming T800-6k polyacrylonitrile-based precursor filaments, and the precursor filaments are fixed for 50 km; the parameters of the filament collecting machine are set as follows: the initial tension was set to 260cN, and the tension reduction ratio λ 1 was set to 60%; the initial contact pressure was set to 110N, and the contact pressure decrease ratio λ 2 was set to 30%; the winding ratio is set as 10 groups, the values of the winding ratio are respectively set as 5.40, 5.30, 5.20, 5.10, 5.00, 4.90, 4.80, 4.70, 4.60 and 4.50, the diameters of the corresponding strands are respectively 0-180mm, 180-200mm, 200-220mm, 220-240mm, 240-260mm, 260-280mm, 280-300mm, 300-320mm, 320-340mm and 340-360 mm.
After the specific implementation, the filament pitch of the polyacrylonitrile-based raw filament roll obtained after the winding and forming in the embodiment is larger than 1.0mm of the diameter of the raw filament, and the distance between the upper end surface and the lower end surface of the polyacrylonitrile-based raw filament roll and the end of the paper roll is 20 mm; the polyacrylonitrile-based raw silk roll has the advantages of flat, compact and smooth upper end surface, lower end surface and side surface, no single silk floating, no silk overlapping, convenient packaging and storage, convenient backing-off due to carbonization, and no broken silk or broken silk in the backing-off process.
Example 3
Referring to fig. 1 to 3, in this embodiment, a filament winding machine is used to wind and form T800-12k polyacrylonitrile-based precursor, and during winding and forming, the parameters of the filament winding machine are set as follows: the initial tension was set to 500cN and the tension reduction ratio λ 1 was set to 90%; the initial contact pressure was set to 120N, and the contact pressure reduction ratio was set to 40%; the winding ratio is set to 13 groups, the values of the winding ratio groups 1-13 are respectively set to 8.60, 8.20, 7.80, 7.40, 7.00, 6.60, 6.20, 5.80, 5.40, 5.00, 4.60, 4.20 and 3.80, the corresponding filament winding diameters are respectively 0-180mm, 180-200mm, 200-220mm, 220-240mm, 240-260mm, 260-280mm, 280-300mm, 300-320mm, 320-340mm, 340-360mm, 360-380mm, 380-400mm and 400-420 mm.
After the specific implementation, the polyacrylonitrile-based raw silk roll obtained after the winding and forming in this embodiment is shown in fig. 5A and 5B. The filament spacing of the winding-molded polyacrylonitrile-based raw filament roll is larger than 1.0mm of the diameter of the raw filament, and the distance between the upper end surface and the lower end surface of the winding-molded polyacrylonitrile-based raw filament roll and the paper roll end is 25 mm; as can be seen from fig. 5A and 5B: the upper end face, the lower end face and the side faces of the polyacrylonitrile-based protofilament are flat, compact and smooth, no monofilament floats out, no overlapped filament exists, the packaging and the storage are convenient, the carbonization is convenient for unwinding, and no broken filament or broken filament exists in the unwinding process.
FIG. 7 is a picture of a T800-12k polyacrylonitrile-based raw filament coil obtained after winding and forming in the prior art, and it is obvious that the filament spacing is extremely small and the yarn overlapping is serious, so that the filament bundle is easy to fluff during carbonization and unwinding.
In summary, the embodiment of the invention provides a winding forming method of polyacrylonitrile-based precursor, which enables tows to freely and stably run and receive yarns through setting the initial tension, the tension reduction ratio, the contact pressure reduction ratio and the winding ratio of a yarn receiving machine, avoids the phenomena of tight and loose tows caused by unreasonable tension and pressure setting, avoids the phenomena of hair caused by excessive traction of the tows or drooping caused by too small tension and the like, and avoids the phenomena of abnormal patterns, collapsed edges, uneven end surface side surfaces, saddle shape and the like caused by unmatched parameters.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (19)
1. A winding forming method of polyacrylonitrile-based protofilament is characterized in that the polyacrylonitrile-based protofilament is wound and formed by a filament winding machine, wherein,
setting the initial tension applied to the polyacrylonitrile-based precursor by the filament receiving machine to be 80-1500 cN; in the winding and forming process, along with the increase of the winding diameter, the tension applied to the polyacrylonitrile-based precursor by the filament winding machine is reduced in a linear proportion;
setting the initial contact pressure applied by the filament receiving machine to the polyacrylonitrile-based precursor to be 50-200N; in the winding and forming process, along with the increase of the winding diameter, the contact pressure applied by the filament winding machine to the polyacrylonitrile-based protofilament is reduced in a linear proportion;
setting the winding ratio to 1-15 groups; when the winding ratios are set to be at least two groups, each group of winding ratios corresponds to the roll diameters in different ranges, and the value of the winding ratio of the next group is smaller than that of the previous group;
wherein, when the winding is finished, the tension F applied to the polyacrylonitrile-based protofilament by the filament winding machine 11 (ii) a It is composed ofIn (F) 11 ＝F 10 (1-. lamda.1); wherein, F 10 Is an initial tension; λ 1 is a tension reduction ratio, and λ 1 is 90% or less.
2. The method for winding polyacrylonitrile-based filament according to claim 1,
if the polyacrylonitrile-based precursor is any one of 1K polyacrylonitrile-based precursor, 3K polyacrylonitrile-based precursor and 6K polyacrylonitrile-based precursor, setting the initial tension applied to the polyacrylonitrile-based precursor by the filament receiving machine to be 80-500 cN;
if the polyacrylonitrile-based precursor is 12K polyacrylonitrile-based precursor, setting the initial tension applied to the polyacrylonitrile-based precursor by the filament receiving machine to be 400-700 cN;
if the polyacrylonitrile-based precursor is 24K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine is set as 600-900 cN.
3. The winding method of polyacrylonitrile-based filament according to claim 2,
and if the polyacrylonitrile-based precursor is 1K polyacrylonitrile-based precursor, setting the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine to be 80-180 cN.
4. The winding method of polyacrylonitrile-based filament according to claim 2,
if the polyacrylonitrile-based precursor is 3K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament winding machine is set to be 120-220 cN.
5. The winding method of polyacrylonitrile-based filament according to claim 2,
if the polyacrylonitrile-based precursor is 6K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine is set to be 260-360 cN.
6. The winding method of polyacrylonitrile-based filament according to claim 2,
if the polyacrylonitrile-based precursor is 12K polyacrylonitrile-based precursor, the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine is set to be 500-600 cN.
7. The winding method of polyacrylonitrile-based filament according to claim 2,
if the polyacrylonitrile-based precursor is 24K polyacrylonitrile-based precursor, setting the initial tension applied to the polyacrylonitrile-based precursor by the filament collecting machine to be 700-800 cN.
8. The polyacrylonitrile-based filament winding method according to any one of claims 1 to 7, characterized in that,
if the polyacrylonitrile-based precursor is any one of 1K polyacrylonitrile-based precursor, 3K polyacrylonitrile-based precursor and 6K polyacrylonitrile-based precursor, the lambda 1 is 30-70%;
if the polyacrylonitrile-based precursor is 12K polyacrylonitrile-based precursor or 24K polyacrylonitrile-based precursor, the lambda 1 is 70-90%.
9. The winding method of polyacrylonitrile-based filaments according to claim 1, characterized in that,
the initial contact pressure of the filament receiving machine on the polyacrylonitrile-based filaments is set to be 70-130N.
10. The winding method of polyacrylonitrile-based filament according to claim 1 or 9, characterized in that, when the winding is finished, the filament receiving machine applies a contact pressure F to the polyacrylonitrile-based filament 21 (ii) a Wherein, F 21 ＝F 20 (1-. lamda.2); wherein, F 20 Initial contact pressure; λ 2 is a contact pressure reduction ratio, and λ 2 is 90% or less.
11. The method for winding polyacrylonitrile-based filament according to claim 10,
if the polyacrylonitrile-based precursor is any one of 1K, 3K and 6K, the lambda 2 is less than or equal to 40 percent;
if the polyacrylonitrile-based strand is 12K or 24K, λ 2 is 50 to 90%.
12. The method for winding polyacrylonitrile-based filament according to claim 1,
the setting range of the winding ratio value is 1.00-10.00; and/or
The difference between the winding ratio values of two adjacent groups is greater than 0 and less than or equal to 2.00.
13. The method for winding and forming polyacrylonitrile-based filament, according to claim 1, wherein the difference of the roll diameters corresponding to the two adjacent winding ratios is roll diameter interval, wherein the maximum value of the roll diameter interval is 50 mm.
14. The polyacrylonitrile-based filament winding method according to claim 13, wherein the difference between the roll diameters corresponding to two adjacent winding ratios is roll diameter interval, wherein the maximum value of the roll diameter interval is 30 mm.
15. The method for winding polyacrylonitrile-based filament according to any one of claims 1 to 7, 9 and 12 to 14, wherein if the polyacrylonitrile-based filament is any one of 1K, 3K and 6K, the difference between the winding ratio values of two adjacent groups is 0.10 to 0.50, and the winding diameter interval is 20 to 30 mm;
if the polyacrylonitrile-based precursor is 12K or 24K, the difference between the winding ratio values of two adjacent groups is 0.30-0.80, and the maximum value of the winding diameter interval is 20 mm.
16. The winding method of polyacrylonitrile-based protofilament according to any one of claims 1 to 7, 9 and 12 to 14, characterized in that the polyacrylonitrile-based protofilament roll obtained after winding has a first end face and a second end face, and the distance between the first end face and the paper roll end and the distance between the second end face and the paper roll end are 10 to 50 mm.
17. The winding method of polyacrylonitrile-based protofilament according to claim 16, wherein the distance between the first end face and the paper roll end and the distance between the second end face and the paper roll end are 15-30 mm.
18. The method for winding polyacrylonitrile-based filament according to any one of claims 1 to 7, 9 and 12 to 14, wherein the pitch of the filament of the roll of polyacrylonitrile-based filament obtained after winding is greater than the diameter of the polyacrylonitrile-based filament by 0.1 to 10.0 mm.
19. The method for winding polyacrylonitrile-based filament according to claim 18, wherein the filament pitch of the roll of polyacrylonitrile-based filament obtained after winding is greater than the diameter of the polyacrylonitrile-based filament, and the difference is 0.5-1.0 mm.
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