CN110578252A - water-blocking aramid yarn and preparation method thereof - Google Patents
water-blocking aramid yarn and preparation method thereof Download PDFInfo
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- CN110578252A CN110578252A CN201910888218.8A CN201910888218A CN110578252A CN 110578252 A CN110578252 A CN 110578252A CN 201910888218 A CN201910888218 A CN 201910888218A CN 110578252 A CN110578252 A CN 110578252A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/285—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acid amides or imides
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/34—Polyamides
- D06M2101/36—Aromatic polyamides
Abstract
the invention relates to a water-blocking aramid yarn and a preparation method thereof, belonging to the technical field of aramid yarn preparation processes for communication optical cables. A water-blocking aramid yarn is prepared by dipping or spraying aramid fibers in an organic polymerization solution, heating to perform polymerization reaction, and then applying oil and collecting filaments; wherein, the aramid yarn finished product index that blocks water includes: the linear density was 800D, the linear density was 1000D and the linear density was 1500D. The preparation method realizes the continuous production of the water-blocking aramid yarn on the aramid spinning production line and ensures that the water-blocking polymer is directly polymerized on the aramid fiber; meanwhile, compared with the water-blocking aramid yarn prepared by bonding water-blocking powder by a physical method, the water-blocking aramid yarn is not easy to fall off; the surface of the water-blocking aramid yarn is oiled, so that the processability of the fiber in later use is improved.
Description
Technical Field
The invention relates to a water-blocking aramid yarn and a preparation method thereof, belonging to the technical field of aramid yarn preparation processes for communication optical cables.
Background
in recent years, with the rapid development of the power communication industry, para-aramid fibers are widely applied to the field of optical cables due to the performance advantages of high strength, high modulus, light weight and the like. However, since the optical cable is susceptible to external environmental changes in applications, such as: moisture and humidity can be caused to penetrate into the core components of the cable, causing damage to the optical fibers and affecting the signal transmission of the cable. In order to ensure the longitudinal sealing of the optical cable and prevent water and moisture from entering the interior of the optical cable and the junction box to damage the metal and the optical fibers, it is desirable that the optical cable can absorb and rapidly expand water that may enter the optical cable, block the continued entry of water, and retain the water that has entered in the water blocking material without penetrating into the optical fibers in the event of a partial outer sheath breakage or an untight seal.
currently, in the process of manufacturing an optical cable, one method is to coat a dry expansion water-blocking material (water-absorbing expansion powder or water-blocking tape) on the surface layer of the core element of the optical cable, such as: the prior art discloses a preparation method of a high-expansion-rate water-absorbent resin for a cable water-blocking tape, CN106317280A and a water-blocking tape for cables and optical cables, CN2569294, but the technical problems are as follows: the overall flow of the optical cable manufacturing process is lengthened, the material consumption is large, the cost is high, the self weight of the optical cable is increased, and meanwhile, the powder falling of the cable is easy to occur in the using process, and finally the problem that the local water blocking effect is poor is caused.
In the process of manufacturing the optical cable, the other method is to bond the water-blocking powder on the surface of the optical cable reinforcing material by a physical method to form the reinforcing material with the water-blocking function, such as water-blocking aramid yarn, water-blocking glass yarn and the like. However, the fiber for reinforcing the optical cable (aramid fiber or glass fiber, etc.) still needs to be processed to prepare water-blocking yarn, and water-blocking powder is usually used for bonding the surface of the fiber, so that the problems of powder falling and the like still exist; meanwhile, the water-blocking aramid yarn prepared by the method is prepared by processing the aramid yarn finished product through a water-blocking process, and the aramid spinning production process and the water-blocking aramid yarn preparation process are not connected together, so that the continuous production of the water-blocking yarn on an aramid spinning production line cannot be realized.
the chinese intellectual property office disclosed a patent document with a publication number CN1737232, entitled "water-blocking aramid yarn and production method thereof", at 2006, month 02 and 22, wherein the patent document discloses: the composite material is prepared from ionized water, sodium hydroxide, acrylic acid, aramid yarn, acrylamide, potassium persulfate and ethanol according to a certain weight ratio by the following method: firstly, pouring a sodium hydroxide solution into a container, and doping ionized water into the container to prepare the sodium hydroxide solution; adding acrylic acid for neutralization; adding acrylamide and stirring; adding potassium persulfate and stirring; adding ethanol and stirring to generate a polymer organic solution; sixthly, putting the aramid yarn into the reactor for soaking and absorbing, and distilling and crystallizing the aramid yarn in a constant-temperature hot oven to generate film-shaped molecular crystals as finished products. The optical cable is applied to nonmetal ADSS optical cables and indoor soft optical cables, the manufacturing process of the optical cable is unchanged, the structure is better, the requirements of water resistance, moisture resistance and mechanical tension resistance of the whole section of the optical fiber cable can be met, and the quality is better.
Disclosure of Invention
the invention aims to solve the problems in the prior art and provides a water-blocking aramid yarn and a preparation method thereof. According to the technical scheme, a specific procedure is added in the spinning production process, namely, in the production process of the aramid fiber, the dried aramid fiber yarn is dipped or sprayed to enable the surface of the fiber to be coated with a specific organic solution, the organic solution permeates into the fiber, then the organic solution is subjected to polymerization reaction (self-polymerization reaction) through heat treatment to form a water-blocking polymer on the fiber, and oiling treatment is carried out through a water-free oil agent to obtain the water-blocking aramid fiber yarn.
in order to achieve the technical purpose, the following technical scheme is proposed:
A water-blocking aramid yarn is prepared from aramid fibres through dry-spraying and wet-spinning, drying, immersing in organic polymerizing liquid or spraying, heating for polymerizing reaction, and winding.
Further, with reference to standard YD/T1115.2-2001, a second portion of water-blocking material for optical communication cables was used: yarn that blocks water ", aramid yarn finished product index that blocks water includes:
The linear density is 800D: the tensile strength is more than or equal to 275N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 47mL/min, the expansion rate is more than or equal to 53mL/g, and the water content (105 ℃/min) is more than or equal to 6 percent;
Linear density 1000D: the tensile strength is more than or equal to 260N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 55 mL/min, the expansion rate is more than or equal to 57 mL/g, and the water content (105 ℃/min) is more than or equal to 6 percent;
Linear density 1500D: the tensile strength is more than or equal to 215N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 53 mL/min, the expansion rate is more than or equal to 58 mL/g, and the water content (105 ℃/min) is more than or equal to 6 percent.
further, after drying treatment, the water content of the aramid fiber filaments is 8-14%.
Further, the organic polymerization liquid comprises the following components in parts by weight: 160-200 parts of deionized water, 35-50 parts of sodium hydroxide, 55-70 parts of acrylic acid, 35-50 parts of acrylamide, 1-10 parts of N, N-methylene bisacrylamide, 2-10 parts of potassium persulfate and 60-80 parts of ethanol.
further, the preparation method of the organic polymerization liquid comprises the following steps:
a. respectively weighing sodium hydroxide and deionized water according to the measurement, and preparing a sodium hydroxide solution with the concentration of 5.5-6.25 mol/L;
b. weighing acrylic acid (monomer) according to the measurement, adding the acrylic acid (monomer) into a sodium hydroxide solution at the speed of 3.4-5.0 mL/min, stirring for 0.25-0.5 h at the rotation speed of 20-50 r/d, controlling the temperature to be 15-35 ℃, and controlling the pH to be 5-7;
c. weighing acrylamide according to the measurement, adding the acrylamide into the solution obtained in the step b, stirring for 0.5-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6;
d. Weighing N.N-methylene bisacrylamide (cross-linking agent) according to the amount, adding the N.N-methylene bisacrylamide (cross-linking agent) into the solution obtained in the step c, stirring for 0.5-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6;
f. weighing potassium persulfate (initiator) according to the amount, adding the potassium persulfate (initiator) into the solution obtained in the step d, stirring for 0.5-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6;
e. And (f) weighing ethanol (active catalyst) according to the amount, adding the ethanol (active catalyst) into the solution obtained in the step f, stirring for 0.75-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6 to obtain the organic polymer solution.
a preparation method of water-blocking aramid yarn comprises the following steps:
A. Pretreatment: drying the aramid fiber yarn spun into yarn by adopting a conventional technology in a dry-jet wet mode at the temperature of 110-160 ℃ to obtain the aramid fiber yarn with the water content of 8-14%;
B. Polymerization reaction: firstly, dipping or spraying the aramid yarn treated in the step A for 0.5-1.5 s by using an organic polymerization solution; secondly, extruding by a compression roller device to remove redundant organic polymerization liquid (so that no obvious liquid drops exist on the surface of the aramid yarn); then, placing the aramid yarn in a heating device, carrying out polymerization reaction for 0.5-2.0 s (crystallizing a polymerization liquid to generate a film-shaped molecular crystal) at the temperature of 180-210 ℃, and controlling the polymer adhesion amount in the aramid yarn after the polymerization reaction to be 10-25% to obtain the aramid yarn with the film-shaped molecular crystal formed on the surface;
C. Oiling: oiling the aramid fiber yarn obtained in the step B;
D. Silk collection: and C, placing the aramid fiber yarn treated in the step C in a yarn collecting machine, and loading into a drum to collect the yarn to obtain the finished product of the water-blocking aramid fiber yarn.
further, the compression roller device is a five-roller device.
Further, the heating device is a constant temperature resistance wire heater.
Further, the organic polymerization liquid storage tank is 3-5 m in length.
Further, in the step C, the oil content of the aramid fiber filaments is controlled to be 1.0-3.0%.
Further, in the yarn collecting machine in the step D, the spinning speed of the water-blocking aramid yarn is 100-500 m/min.
By adopting the technical scheme, the beneficial technical effects brought are as follows:
1) The preparation method realizes the continuous production of the water-blocking aramid yarn on the aramid spinning production line and ensures that the water-blocking polymer is directly polymerized on the aramid fiber; meanwhile, compared with the water-blocking aramid yarn prepared by bonding water-blocking powder by a physical method, the water-blocking aramid yarn is not easy to fall off; oiling treatment is carried out on the surface of the water-blocking aramid yarn, so that the processability of the fiber in later use is improved;
2) in the invention, the adhesion of the water-blocking polymer is completed before the aramid fiber is oiled, so that the phenomenon that an oiling agent forms an isolating layer on the surface of the fiber to prevent a solution from entering the interior of the fiber and form the water-blocking polymer in the fiber is completely avoided, and the formed water-blocking aramid yarn has better water absorption effect and higher water absorption rate;
3) In the invention, the continuous production of the water-blocking aramid yarn has simple production process and high production efficiency, and the water-blocking aramid yarn with the linear density of 800D, 1000D and 1500D is obtained;
4) In the invention, by adding a specific procedure, namely a water-blocking aramid yarn production procedure, in the spinning production process, the continuous production process of raw materials, spinning pulp, aramid yarn and water-blocking yarn is realized, the time cost is greatly shortened, and the production efficiency is improved; secondly, the specific organic polymer solution for producing the finished product is a non-toxic and pollution-free reagent, reduces the processes of environmental pollution, waste liquid recovery and treatment and the like, and saves the production cost; and moreover, the production raw material source of the aramid fiber yarn is stable, the raw material cost is low, the produced water-blocking aramid fiber yarn conforms to YD/T1115.2-2001, and the water-blocking material for the communication cable and the optical cable comprises a second part: the water-blocking yarn has the advantages of product standard, stable product performance and good water-blocking effect.
drawings
FIG. 1 is a flow chart of a production process of aramid filaments in the prior art;
FIG. 2 is a flow chart of a production process of water-blocking aramid yarn in the prior art;
FIG. 3 is a flow chart of a production process of water-blocking aramid yarn in the present invention;
fig. 4 is a schematic diagram of a production process of the water-blocking aramid yarn in the invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A water-blocking aramid yarn is prepared from aramid fibres through dry-spraying and wet-spinning, drying, immersing in organic polymerizing liquid or spraying, heating for polymerizing reaction, and winding.
Example 2
A preparation method of water-blocking aramid yarn comprises the following steps:
A. pretreatment: drying the aramid fiber yarn spun into yarn by adopting a conventional technology in a dry-jet wet mode at the temperature of 110 ℃ to obtain the aramid fiber yarn with the water content of 8%;
B. Polymerization reaction: firstly, dipping or spraying the aramid yarn treated in the step A for 0.5s by adopting an organic polymerization solution; secondly, extruding by a compression roller device to remove redundant organic polymerization liquid (so that no obvious liquid drops exist on the surface of the aramid yarn); then, placing the aramid yarn in a heating device, carrying out polymerization reaction for 2.0s (crystallizing a polymerization solution by distillation to generate film-shaped molecular crystals) at the temperature of 180 ℃, and controlling the polymer attachment amount in the aramid yarn after the polymerization reaction to be 10% to obtain the aramid yarn with the film-shaped molecular crystals formed on the surface;
C. oiling: oiling the aramid fiber yarn obtained in the step B;
D. silk collection: and C, placing the aramid fiber yarn treated in the step C in a yarn collecting machine, and loading into a drum to collect the yarn to obtain the finished product of the water-blocking aramid fiber yarn.
Example 3
A preparation method of water-blocking aramid yarn comprises the following steps:
A. Pretreatment: drying the aramid fiber yarn spun into yarn by adopting a conventional technology in a dry-jet wet mode at 160 ℃ to obtain the aramid fiber yarn with the water content of 14%;
B. Polymerization reaction: firstly, dipping or spraying the aramid yarn treated in the step A for 1.5s by adopting an organic polymerization solution; secondly, extruding by a compression roller device to remove redundant organic polymerization liquid (so that no obvious liquid drops exist on the surface of the aramid yarn); then, placing the aramid yarn in a heating device, carrying out polymerization reaction for 0.5s (crystallizing a polymerization solution by distillation to generate film-shaped molecular crystals) at the temperature of 210 ℃, and controlling the polymer attachment amount in the aramid yarn after the polymerization reaction to be 25% to obtain the aramid yarn with the film-shaped molecular crystals formed on the surface;
C. Oiling: oiling the aramid fiber yarn obtained in the step B;
D. Silk collection: and C, placing the aramid fiber yarn treated in the step C in a yarn collecting machine, and loading into a drum to collect the yarn to obtain the finished product of the water-blocking aramid fiber yarn.
example 4
A preparation method of water-blocking aramid yarn comprises the following steps:
A. Pretreatment: drying the aramid fiber yarn spun into yarn by adopting a conventional technology in a dry-jet wet mode at 140 ℃ to obtain the aramid fiber yarn with the water content of 11%;
B. Polymerization reaction: firstly, dipping or spraying the aramid yarn treated in the step A for 1.0 s by adopting an organic polymerization solution; secondly, extruding by a compression roller device to remove redundant organic polymerization liquid (so that no obvious liquid drops exist on the surface of the aramid yarn); then, placing the aramid yarn in a heating device, carrying out polymerization reaction for 1.4s (crystallizing a polymerization solution by distillation to generate film-shaped molecular crystals) at the temperature of 195 ℃, and controlling the polymer attachment amount in the aramid yarn after the polymerization reaction to be 16% to obtain the aramid yarn with the film-shaped molecular crystals formed on the surface;
C. oiling: oiling the aramid fiber yarn obtained in the step B;
D. Silk collection: and C, placing the aramid fiber yarn treated in the step C in a yarn collecting machine, and loading into a drum to collect the yarn to obtain the finished product of the water-blocking aramid fiber yarn.
example 5
On the basis of examples 2 to 4, further,
The organic polymerization liquid comprises the following components in parts by weight: 160 parts of deionized water, 35 parts of sodium hydroxide, 55 parts of acrylic acid, 35 parts of acrylamide, 1 part of N, N-methylene bisacrylamide, 2 parts of potassium persulfate and 60 parts of ethanol;
The preparation method of the organic polymerization liquid comprises the following steps:
a. respectively weighing sodium hydroxide and deionized water according to the measurement, and preparing a sodium hydroxide solution with the concentration of 5.5 mol/L;
b. Weighing acrylic acid according to the measurement, adding the acrylic acid into a sodium hydroxide solution at the speed of 3.4mL/min, stirring for 0.25 h at the rotation speed of 20r/d, controlling the temperature to be 15 ℃ and controlling the pH value to be 5;
c. Weighing acrylamide according to the weight, adding the acrylamide into the solution obtained in the step b, and stirring for 0.5h at the rotation speed of 20r/d, wherein the temperature is controlled to be 22 ℃, and the pH value is controlled to be 6;
d. weighing N.N-methylene bisacrylamide (cross-linking agent) according to the amount, adding the N.N-methylene bisacrylamide (cross-linking agent) into the solution obtained in the step c, stirring for 0.5h at the rotation speed of 20r/d, controlling the temperature to be 22 ℃ and controlling the pH to be 6;
f. weighing potassium persulfate (initiator) according to the amount, adding the potassium persulfate (initiator) into the solution obtained in the step d, stirring for 0.5h at the rotation speed of 20r/d, controlling the temperature to be 22 ℃ and controlling the pH value to be 6;
e. And (f) weighing ethanol (active catalyst) according to the amount, adding the ethanol (active catalyst) into the solution obtained in the step f, stirring for 0.75h at the rotation speed of 20r/d, controlling the temperature to be 22 ℃ and the pH to be 6, and obtaining the organic polymer solution.
example 6
on the basis of embodiment 5, the present embodiment is distinguished in that:
the organic polymerization liquid comprises the following components in parts by weight: 200 parts of deionized water, 50 parts of sodium hydroxide, 70 parts of acrylic acid, 50 parts of acrylamide, 10 parts of N, N-methylene-bisacrylamide, 10 parts of potassium persulfate and 80 parts of ethanol;
The preparation method of the organic polymerization liquid comprises the following steps:
a. respectively weighing sodium hydroxide and deionized water according to the measurement to prepare a sodium hydroxide solution with the concentration of 6.25 mol/L;
b. weighing acrylic acid according to the measurement, adding the acrylic acid into a sodium hydroxide solution at the speed of 5.0mL/min, stirring the acrylic acid at the speed of 50r/d for 0.5h h, controlling the temperature to be 35 ℃ and the pH to be 7;
c. Weighing acrylamide according to the weight, adding the acrylamide into the solution obtained in the step b, stirring for 1h at the rotation speed of 50r/d, controlling the temperature to be 30 ℃ and controlling the pH value to be 6;
d. weighing N.N-methylene bisacrylamide (cross-linking agent) according to the amount, adding the N.N-methylene bisacrylamide (cross-linking agent) into the solution obtained in the step c, stirring for 1 hour at the rotating speed of 50r/d, controlling the temperature to be 30 ℃ and controlling the pH to be 6;
f. Weighing potassium persulfate (initiator) according to the amount, adding the potassium persulfate (initiator) into the solution obtained in the step d, stirring for 1h at the rotating speed of 50r/d, controlling the temperature to be 30 ℃ and controlling the pH to be 6;
e. And f, weighing ethanol (active catalyst) according to the amount, adding the ethanol (active catalyst) into the solution obtained in the step f, stirring for 1h at the rotating speed of 50r/d, controlling the temperature to be 30 ℃ and the pH to be 6, and obtaining the organic polymerization solution.
Example 7
on the basis of examples 5 to 6, the present example differs in that:
the organic polymerization liquid comprises the following components in parts by weight: 180 parts of deionized water, 42 parts of sodium hydroxide, 61 parts of acrylic acid, 45 parts of acrylamide, 6 parts of N, N-methylene-bisacrylamide, 6 parts of potassium persulfate and 70 parts of ethanol.
The preparation method of the organic polymerization liquid comprises the following steps:
a. Respectively weighing sodium hydroxide and deionized water according to the measurement to prepare a sodium hydroxide solution with the concentration of 6.10 mol/L;
b. weighing acrylic acid according to the measurement, adding the acrylic acid into a sodium hydroxide solution at the speed of 4.9mL/min, stirring for 0.3h at the rotating speed of 35r/d, controlling the temperature to be 30 ℃ and the pH to be 6;
c. weighing acrylamide according to the weight, adding the acrylamide into the solution obtained in the step b, and stirring for 0.6h at the rotation speed of 50r/d, controlling the temperature to be 29 ℃ and the pH to be 6;
d. Weighing N.N-methylene bisacrylamide (cross-linking agent) according to the amount, adding the N.N-methylene bisacrylamide (cross-linking agent) into the solution obtained in the step c, stirring for 0.6h at the rotation speed of 50r/d, controlling the temperature to be 29 ℃ and the pH to be 6;
f. weighing potassium persulfate (initiator) according to the amount, adding the potassium persulfate (initiator) into the solution obtained in the step d, stirring for 0.8h at the rotating speed of 48r/d, controlling the temperature to be 25 ℃ and controlling the pH to be 6;
e. and f, weighing ethanol (active catalyst) according to the amount, adding the ethanol (active catalyst) into the solution obtained in the step f, stirring for 0.9h at the rotating speed of 48r/d, controlling the temperature to be 23 ℃ and the pH to be 6, and obtaining the organic polymer solution.
Example 8
On the basis of examples 5 to 7, further,
The compression roller device is a five-roller device.
The heating device is a constant temperature resistance wire heater.
The organic polymerization liquid storage tank has a length of 3 m.
example 9
On the basis of embodiment 8, the present embodiment is different in that:
the organic polymerization liquid storage tank has a length of 5 m.
Example 10
on the basis of examples 8 to 9, the present example differs in that:
the organic polymerization liquid storage tank has a length of 4 m.
Example 11
on the basis of examples 8 to 10, further,
In the step C, the oil content of the aramid fiber filaments is controlled to be 1.0%.
and D, in the yarn collecting machine in the step D, the spinning speed of the water-blocking aramid yarn is 100 m/min.
Example 12
on the basis of embodiment 11, the present embodiment is different in that:
in the step C, the oil content of the aramid fiber filaments is controlled to be 3.0%.
And D, in the yarn collecting machine in the step D, the spinning speed of the water-blocking aramid yarn is 500 m/min.
example 13
On the basis of examples 11 to 12, this example differs in that:
in the step C, the oil content of the aramid fiber filaments is controlled to be 2.0%.
and D, in the yarn collecting machine in the step D, the spinning speed of the water-blocking aramid yarn is 300 m/min.
example 14
drying 1000kg of aramid filaments in a dryer at the temperature of 120 ℃ to enable the water content of the aramid filaments to be 13%, then dipping the aramid filaments in an organic polymerization solution (wherein the concentration of NaOH is 6.0mol/L, the concentration of acrylic acid is 4.0 mol/L, the concentration of acrylamide is 3.3mol/L, the concentration of N, N-methylene bisacrylamide is 0.25mol/L, the concentration of potassium persulfate is 0.12mol/L, and the concentration of ethanol is 8.5 mol/L) for 1.5s, and then removing liquid drops attached to the surfaces of the aramid filaments; then carrying out polymerization reaction for 1.5s at the temperature of 190 ℃, forming film-shaped molecular crystals on the surface of the aramid yarn, and enabling the polymer attachment amount in the aramid yarn after the polymerization reaction to be 15%; and finally, obtaining 1204kg of finished waterproof aramid yarn after oiling and yarn winding treatment.
the organic polymerization liquid comprises the following components in parts by weight: 170 parts of deionized water, 36 parts of sodium hydroxide, 70 parts of monomer, 40 parts of acrylamide, 5 parts of cross-linking agent, 5 parts of initiator and 70 parts of active catalyst.
Reference standard YD/T1115.2-2001, a second part of water-blocking material for telecommunication cables and cables: water-blocking yarn ", the finished water-blocking aramid yarn products of examples 1-14 were tested, and the obtained indices included:
The linear density is 800D: the tensile strength is more than or equal to 275N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 47mL/min, the expansion rate is more than or equal to 53mL/g, and the water content (105 ℃/min) is more than or equal to 6 percent;
Linear density 1000D: the tensile strength is more than or equal to 260N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 55 mL/min, the expansion rate is more than or equal to 57 mL/g, and the water content (105 ℃/min) is more than or equal to 6 percent;
Linear density 1500D: the tensile strength is more than or equal to 215N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 53 mL/min, the expansion rate is more than or equal to 58 mL/g, and the water content (105 ℃/min) is more than or equal to 6 percent.
comparative example
Based on example 14, the production of 800D water-blocking aramid filaments is exemplified.
Firstly, researching the influence of heating temperature on the performance of the water-blocking aramid yarn in pretreatment
As shown in table 1 below, it follows: with the increase of the pretreatment temperature, the breaking elongation of the waterproof aramid yarn is increased, the moisture content is reduced, and the tensile strength, the expansion rate and the expansion rate are not changed greatly.
Secondly, the influence of the dipping time of the organic polymer solution on the performance of the water-blocking aramid yarn is researched
In the study, the pretreatment drying temperature of the aramid fiber yarn as the raw material is 130 ℃, then the dried aramid fiber yarn is impregnated by the organic polymerization solution, and the results of the influence on the performance of the water-blocking aramid fiber yarn under the limitation of different impregnation times are shown in the following table 2.
From table 2, it follows: with the increase of the dipping time, the expansion rate and the expansion rate of the water-blocking aramid yarn are increased and then reduced, and the tensile strength, the elongation at break and the water content are less influenced by the dipping time.
Influence of polymerization reaction temperature on performance of water-blocking aramid yarn
In the present study, the drying temperature of the pretreatment of the aramid fiber yarn as the raw material is 130 ℃, the organic polymer solution is dipped for 1.5s, and then the results of the influence on the performance of the water-blocking aramid fiber yarn under different temperature limits of the polymerization reaction are shown in the following table 3.
From table 3, it follows: along with the increase of the polymerization reaction temperature, the expansion rate and the expansion rate of the water-blocking aramid yarn are increased and then decreased, the elongation at break is in an increasing trend, the water content is in a decreasing trend, and the tensile strength is less influenced by the polymerization reaction temperature.
Fourth, the influence of polymerization reaction time on the performance of the water-blocking aramid yarn
in the present study, the pretreatment drying temperature of the raw material aramid fiber yarn is 130 ℃, the organic polymer solution is dipped for 1.5s, the polymerization reaction temperature is 200 ℃, and then the results of the influence on the performance of the water-blocking aramid fiber yarn under different time limits of the polymerization reaction are shown in table 4 below.
From table 4, it follows: along with the increase of the polymerization reaction time, the expansion rate and the expansion rate of the water-blocking aramid yarn are increased firstly, and are kept unchanged after being increased to a certain degree, and the tensile strength, the elongation at break and the water content are slightly influenced by the polymerization reaction time.
Fifthly, influence of the dosage of the initiator in the organic polymerization liquid on the water absorption performance of the water-blocking aramid yarn
In the study, potassium persulfate is used as an initiator, the pretreatment drying temperature of the aramid fiber yarn is 130 ℃, the organic polymerization solution is soaked for 2.0s, the polymerization reaction temperature is 200 ℃, the neutralization degree is 80%, and then the final result of the influence on the water absorption performance of the water-blocking aramid fiber yarn is shown in the following table 5 under the limit of different dosage (in percentage by mass of acrylic acid monomers) of the initiator.
from table 5, it follows: the dosage of the initiator has great influence on the water absorption performance of the water-blocking aramid yarn. When the initiator is 0.01-0.14 wt%, the water absorption performance of the water-blocking aramid yarn is increased along with the increase of the using amount of the initiator; when the amount of the initiator is more than 0.14wt%, the water absorption performance of the water-blocking aramid yarn is reduced along with the increase of the amount of the initiator (because the amount of the initiator directly influences the crosslinking degree and the molecular weight of the polymer in the resin synthesis process), so that the water-blocking aramid yarn meets the standard YD/T1115.2-2001, and the water-blocking material for communication cables and optical cables is the second part: and (4) water-blocking yarn, wherein the optimal dosage of the initiator is 0.01-0.14 wt%.
Sixth, the influence of monomer concentration in organic polymerization liquid on the water absorption performance of the water-blocking aramid yarn
In the present study, the monomer concentration refers to the mass concentration of acrylic acid monomer and its sodium salt dissolved in deionized water, the pretreatment drying temperature of the raw material aramid fiber filament is 130 ℃, the organic polymer solution is dipped for 2.0s, the polymerization reaction temperature is 200 ℃, the neutralization degree is 80%, the amount of the initiator potassium persulfate is 0.14wt%, and then the final result on the water absorption performance of the water-blocking aramid fiber is shown in table 6 below under the limitation of different concentrations of the monomers.
From table 6, it follows: the water absorption performance of the water-blocking aramid yarn is firstly increased and then reduced along with the increase of the monomer concentration, and when the monomer concentration is 34-35 wt%, the water absorption performance of the water-blocking aramid yarn is the best (the water absorption performance of the water-blocking aramid yarn is influenced because the change of the monomer concentration causes the change of a resin network structure). Thus, by experimental study comparison, and in compliance with Standard YD/T1115.2-2001, a second part of water-blocking material for optical communication cables was: the optimal monomer concentration of the water-blocking yarn is 34-35 wt%.
seventh, the influence of the dosage of the cross-linking agent in the organic polymerization liquid on the water absorption performance of the water-blocking aramid yarn
In the present study, n.n-methylenebisacrylamide is used as a crosslinking agent, a raw material aramid fiber yarn is selected to be pretreated and dried at 130 ℃, an organic polymer solution is soaked for 2.0 seconds, a polymerization reaction temperature is 200 ℃, a neutralization degree is 80%, an initiator potassium persulfate is used at 0.14wt%, an acrylic acid monomer concentration is 35%, and then, under the limit of different amounts (in percentage by mass of the acrylic acid monomer) of the crosslinking agent, the result of the influence on the water absorption performance of the water-blocking aramid fiber is finally shown in the following table 7.
From table 7, it follows: the water absorption performance of the water-blocking aramid yarn is firstly increased and then reduced along with the increase of the dosage of the cross-linking agent, and when the mass fraction of the cross-linking agent is 0.08-0.14 wt%, the water absorption performance of the water-blocking aramid yarn is the best (because the dosage of the cross-linking agent directly influences the distance between cross-linking points of polymers, the water absorption performance of the water-blocking aramid yarn is influenced). Thus, by experimental study comparison, and in compliance with Standard YD/T1115.2-2001, a second part of water-blocking material for optical communication cables was: the cross-linking agent of the water-blocking yarn is 0.08-0.14 wt% in the best quality fraction.
Claims (10)
1. The water-blocking aramid yarn is characterized by being prepared by carrying out dry-jet wet spinning on aramid filaments, drying the aramid filaments, then dipping or spraying organic polymer solution, heating the aramid filaments to carry out polymerization reaction, and then oiling and collecting the aramid filaments;
the finished water-blocking aramid yarn product indexes comprise:
the linear density is 800D, the tensile strength is more than or equal to 275N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 47mL/min, the expansion rate is more than or equal to 53mL/g, and the water content is more than or equal to 6 percent;
the linear density is 1000D, the tensile strength is more than or equal to 260N, the breaking elongation is more than or equal to 18 percent, the expansion rate is more than or equal to 55 mL/min, the expansion rate is more than or equal to 57 mL/g, and the water content is more than or equal to 6 percent;
linear density 1500D: the tensile strength is more than or equal to 215N, the elongation at break is more than or equal to 18 percent, the expansion rate is more than or equal to 53 mL/min, the expansion rate is more than or equal to 58 mL/g, and the water content is more than or equal to 6 percent.
2. A method for preparing a water-blocking aramid yarn as claimed in claim 1, comprising the steps of:
A. pretreatment: drying the aramid fiber yarn spun into yarn in a dry-jet wet mode at the temperature of 110-160 ℃ to obtain dry aramid fiber yarn;
B. Polymerization reaction: b, dipping or spraying the aramid yarn treated in the step A for 0.5-1.5 s by using an organic polymerization solution; then, extruding by a compression roller device until no liquid drops exist on the surface of the aramid yarn; then placing the aramid yarn in a heating device, carrying out polymerization reaction for 0.5-2.0 s at the temperature of 180-210 ℃, and controlling the polymer attachment amount in the aramid yarn after polymerization reaction to be 10-25%, thus obtaining the aramid yarn with film-shaped molecular crystals formed on the surface;
C. Oiling: oiling the aramid fiber yarn obtained in the step B;
D. silk collection: and C, placing the aramid fiber yarn treated in the step C in a yarn collecting machine, and loading into a drum to collect the yarn to obtain the finished product of the water-blocking aramid fiber yarn.
3. the preparation method of the water-blocking aramid yarn according to claim 2, wherein in the step A, the moisture content of the dry aramid yarn is 8-14%.
4. the preparation method of the water-blocking aramid yarn as claimed in claim 2, wherein in the step B, the organic polymer solution comprises the following components in parts by weight: 160-200 parts of deionized water, 35-50 parts of sodium hydroxide, 55-70 parts of monomer, 35-50 parts of acrylamide, 1-10 parts of cross-linking agent, 2-10 parts of initiator and 60-80 parts of active catalyst.
5. the method of preparing water-blocking aramid yarn of claim 4, wherein the method of preparing the organic polymer solution comprises:
a. respectively weighing sodium hydroxide and deionized water according to the measurement, and preparing a sodium hydroxide solution with the concentration of 5.5-6.25 mol/L;
b. weighing monomers according to the measurement, adding the monomers into a sodium hydroxide solution at the speed of 3.4-5.0 mL/min, stirring for 0.25-0.5 h at the rotation speed of 20-50 r/d, controlling the temperature to be 15-35 ℃, and controlling the pH to be 5-7;
c. Weighing acrylamide according to the measurement, adding the acrylamide into the solution obtained in the step b, stirring for 0.5-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6;
d. Weighing the cross-linking agent according to the amount, adding the cross-linking agent into the solution obtained in the step c, stirring for 0.5-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6;
f. weighing an initiator according to the measurement, adding the initiator into the solution obtained in the step d, stirring for 0.5-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6;
e. and f, weighing the active catalyst according to the amount, adding the active catalyst into the solution obtained in the step f, stirring for 0.75-1 h at the rotating speed of 20-50 r/d, controlling the temperature to be 22-30 ℃, and controlling the pH to be 6 to obtain the organic polymerization solution.
6. A method of producing water-blocking aramid yarn as claimed in claim 4 or claim 5 wherein the monomer is acrylic acid, the cross-linking agent is N.N-methylenebisacrylamide, the initiator is potassium persulfate, and the active catalyst is ethanol.
7. the method for preparing a water-blocking aramid yarn as claimed in claim 2, wherein in step B, the press roll device is a five roll device.
8. the method for preparing water-blocking aramid yarn as claimed in claim 2, wherein in step B, the heating device is a constant temperature resistance wire heater.
9. the preparation method of the water-blocking aramid yarn as claimed in claim 2, wherein in the step C, the oil content of the aramid yarn is controlled to be 1.0-3.0%.
10. the preparation method of the water-blocking aramid yarn according to claim 2, wherein in the yarn collecting machine of step D, the spinning speed of the water-blocking aramid yarn is 100 to 500 m/min.
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Application publication date: 20191217 |