CN111675873A - Flame-retardant data connecting wire and preparation method thereof - Google Patents

Abstract

The invention discloses a flame-retardant data connecting wire which comprises a conductive core wire and a sheath layer coated on the surface of the conductive core wire, wherein the sheath layer is prepared from the following raw materials in parts by weight: 50-60 parts of polyvinyl chloride resin, 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant; the invention also discloses a preparation method of the data connecting line. The data connecting wire is formed by coating a specially-made sheath layer on the surface of a conductive core wire, the sheath layer adopts polyvinyl chloride as a base material and is added with a composite flame retardant, and the composite flame retardant not only can play a role in flame retardance and smoke suppression, but also can play a role in plasticization; the stabilizer is added into the sheath layer, the obtained sheath layer has high flame retardance and impact resistance, the core wire can be effectively protected, the data connecting wire can continuously work in a higher temperature environment, and the use safety of the data connecting wire is improved.

Description

Flame-retardant data connecting wire and preparation method thereof

Technical Field

The invention belongs to the field of data connecting lines, and particularly relates to a flame-retardant data connecting line and a preparation method thereof.

Background

The data line is used for connecting the mobile device and the computer or the mobile device and the mobile device to achieve the purpose of data transmission or communication, is usually used for connecting the computer and the mobile device or the mobile device and the mobile device to be used as a path tool for transmitting files such as videos, ringtones, pictures and the like, and becomes an indispensable part in our life along with the development of the electronic industry in a daily life; the data line often can produce the heat in the use, when reaching certain temperature, often arouses the conflagration easily, causes economic loss, and the security is not high, and data line length time also can accelerate the ageing of data line in being in higher temperature environment in addition, reduces the life of data line.

Chinese patent with the patent number of CN201510523582.6 discloses a novel halogen-free flame-retardant modified thermoplastic elastomer data line sheath material and a preparation method thereof, wherein the data line sheath material is prepared from the following raw materials in parts by weight: 100-104 parts of SEBS, 65-68 parts of paraffin oil, 29-31 parts of polypropylene, 21-23 parts of polypropylene grafted maleic anhydride, 2153-4 parts of antioxidant B, 81-83 parts of magnesium hydroxide, 10.5-12 parts of expanded graphite, 1.7 parts of silane coupling agent A-1711.6, 8-9 parts of absolute ethyl alcohol, 2-3 parts of stearic acid, 9-11 parts of calcium carbonate, 2-3 parts of silicone master batch, 1-1.5 parts of calcium oxide/zinc, 5-7 parts of maleic acid and 1.5-2 parts of polyvinyl alcohol. However, in the application, the magnesium hydroxide and the expanded graphite are used as effective components for improving flame retardance, are inorganic substances, are poor in compatibility with organic substrates SEBS, polypropylene and the like, and can influence the performance of flame retardance, so that the flame retardance of the protective sleeve material cannot meet the requirement.

Disclosure of Invention

The invention aims to provide a flame-retardant data connecting wire and a preparation method thereof, wherein the data connecting wire is formed by coating a specially-made sheath layer on the surface of a conductive core wire, the sheath layer adopts polyvinyl chloride as a base material and is added with a composite flame retardant, and the composite flame retardant can be uniformly dispersed in a matrix to play the functions of flame retardance and smoke suppression, can also increase the space among PVC molecular chains and play the role of plasticization; the stabilizer is added into the sheath layer, and can neutralize and absorb HCl, prevent the decomposition and self-catalysis of long chains, prolong the induction time and further improve the stability of PVC; the obtained sheath layer has flame-retardant and impact-resistant high performance, and can effectively protect the core wire when being used for coating the conductive core wire, so that the data connecting wire can continuously work in a higher temperature environment, and the use safety of the data connecting wire is improved.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a fire-retardant data connecting wire, includes electrically conductive heart yearn and cladding in the restrictive coating on electrically conductive heart yearn surface, the restrictive coating is made by following part by weight raw materials: 50-60 parts of polyvinyl chloride resin, 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant;

the data connecting line is manufactured by the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, taking out the premix, crushing the premix into particles, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours;

and thirdly, adding the dried material into a machine barrel of a double-screw extruder for plasticizing and melting, extruding the melted material into a machine head die through a screw in the machine barrel, drawing the conductive core wire, passing through the machine head die of the double-screw extruder, coating the conductive core wire by the material to form a sheath layer after passing through the machine head die, and then sequentially carrying out water cooling and drying to obtain the data connecting wire.

Further, the composite flame retardant is prepared by the following method:

(1) washing chlorite with deionized water for 4-5 times, adding 1% titanate coupling agent and 5% stearic acid, stirring at 40 deg.C for 1h, taking out, washing with anhydrous alcohol repeatedly, and oven drying to obtain modified chlorite;

(2) mixing modified chlorite and molybdenum trioxide according to the mass ratio of 8-10:1, adding a certain amount of deionized water to form slurry, putting the slurry into a ball milling tank, adding zirconia balls for ball milling for 12 hours at the ball milling speed of 600r/min, carrying out vacuum filtration on the slurry, and drying to obtain composite powder;

(3) putting 35mL of ethyl acetate and 50mL of absolute ethyl alcohol into a round-bottom flask, adding 4mg of p-aminophenyltrimethoxysilane, uniformly mixing, then adding 1.5g of composite powder, then putting the round-bottom flask into a paraffin bath at 120 ℃, refluxing for 20h under the stirring condition of 400r/min, after the reaction is finished, centrifugally washing for 6 times by using 95% of ethanol, drying for 12-14h in an oven at 90 ℃, taking out and grinding to obtain the composite flame retardant.

Further, the stabilizer is prepared by the following method:

1) adding maleic anhydride and 2-phenyl-1, 3-propylene glycol in a molar ratio of 1:1 into a four-neck flask, introducing nitrogen for 15min in advance, putting the flask into an oil bath pot under the protection of the nitrogen, heating to 90 ℃ under the condition of mechanical stirring, and reacting for 110-120min under the condition of constant-temperature stirring at 90 ℃ to obtain an intermediate;

2) putting 10.5g of the intermediate into a four-neck flask, putting the flask into an oil bath kettle at 90 ℃, slowly adding 16.8g of a mixture of calcium acetate and zinc acetate, heating to 120 ℃ after all the mixture is added, continuing to react for 2 hours, and distilling under reduced pressure after the reaction is finished until no liquid is distilled out to obtain a product;

3) uniformly mixing the product obtained in the step 2) with beta-diketone according to the mass ratio of 9:1 to obtain the stabilizer.

Further, the mass ratio of calcium acetate to zinc acetate in the step 2) is 1.5: 1.

a preparation method of a flame-retardant data connecting line comprises the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, taking out the premix, crushing the premix into particles, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours;

and thirdly, adding the dried material into a machine barrel of a double-screw extruder for plasticizing and melting, extruding the melted material into a machine head die through a screw in the machine barrel, drawing the conductive core wire, passing through the machine head die of the double-screw extruder, coating the conductive core wire by the material to form a sheath layer after passing through the machine head die, and then sequentially carrying out water cooling and drying to obtain the data line.

The invention has the beneficial effects that:

the data connecting wire is formed by coating a specially-made sheath layer on the surface of a conductive core wire, wherein the sheath layer adopts polyvinyl chloride as a base material and is added with a composite flame retardant, molybdenum trioxide is hydrolyzed by ball milling in the preparation process of composite powder to generate molybdate ions, and part of the molybdate ions enter into the layers of chlorite to form eutectic crystals so as to form a perfect crystal structure and uniformly disperse the components; the chlorite can release a large amount of water vapor and CO₂The decomposition of PVC is delayed, HCl is absorbed by virtue of alkalinity, molybdenum trioxide in the PVC can promote HCl removal of the PVC, cis-polyene isomerization is converted into trans-polyene, the trans-polyene cannot be cyclized into an aromatic compound, the formation of benzene and aromatic compounds is inhibited, the smoke density is gradually reduced, the smoke suppression purpose is achieved, the molybdenum trioxide can carbonize the PVC after combustion, the contact between the inside unburned PVC and a heat source and air is isolated, the PVC is prevented from being continuously combusted, and the generation of hydrogen chloride is reducedThe amount of smoke; in addition, the-NH on the p-aminophenyl trimethoxy silane is modified₂The silane-modified PVC composite material has the advantages that the silane-modified PVC composite material reacts with-OH on the surface of the composite powder, so that silane chains are grafted on the surface of the composite powder, the compatibility of the composite powder and a PVC matrix can be improved, a silicon-containing compound can be pyrolyzed at high temperature to generate silicon dioxide, the chemical stability is higher, the mechanical strength of a carbon layer can be enhanced, and the silicon dioxide can form a Si-O-Si net structure in the carbon layer, so that a ceramic-like structure is formed to cover the surface of the carbon layer, and the flame retardance is further improved; in addition, benzene rings on the silane chains have an anchoring effect, so that the spacing between PVC molecular chains can be increased, a plasticizing effect is achieved, and the impact resistance of the material is improved;

according to the invention, the stabilizer is added into the raw material of the sheath layer, and the C ═ C double bond structure in the maleic anhydride in the stabilizer can perform addition reaction with the conjugated polyene chain generated by heating the PVC long chain, so that the growth of the conjugated polyene chain is stopped to a certain extent, and the HCl release rate is delayed; secondly, hydroxyl which does not participate in the reaction in the 2-phenyl-1, 3-propylene glycol can generate a complex reaction with metal calcium/zinc ions, so that the autocatalysis effect of metal chloride on the PVC is inhibited; in addition, metal calcium/zinc ions in the stabilizer can absorb HCl to the maximum extent, and the stabilizer can absorb HCl in a neutralizing manner, prevent long-chain decomposition and self-catalysis, prolong induction time and further improve the stability of PVC; moreover, 2 carbonyl groups in the beta-diketone can form a stable chelate with metal chloride to replace allyl chloride, inhibit HCl removal, prevent initial coloring and prolong initial thermal stability, so that the stabilizer has good stability on PVC at different periods; benzene rings in the 2-phenyl-1, 3-propanediol in the stabilizer can also play a role in anchoring and improve the impact resistance of the material;

the data connecting wire is formed by coating a specially-made sheath layer on the surface of a conductive core wire, the sheath layer adopts polyvinyl chloride as a base material and is added with a composite flame retardant, and the composite flame retardant can be uniformly dispersed in a matrix to play the functions of flame retardance and smoke suppression, and can also increase the distance between PVC molecular chains to play the role of plasticization; the stabilizer is added into the sheath layer, and can neutralize and absorb HCl, prevent the decomposition and self-catalysis of long chains, prolong the induction time and further improve the stability of PVC; the obtained sheath layer has flame-retardant and impact-resistant high performance, and can effectively protect the core wire when being used for coating the conductive core wire, so that the data connecting wire can continuously work in a higher temperature environment, and the use safety of the data connecting wire is improved.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

The utility model provides a fire-retardant data connecting wire, includes electrically conductive heart yearn and cladding in the restrictive coating on electrically conductive heart yearn surface, and wherein, the restrictive coating plays the guard action to electrically conductive heart yearn, and the restrictive coating is made by following part by weight raw materials: 50-60 parts of polyvinyl chloride (PVC), 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant;

the plasticizer is dioctyl adipate, diisooctyl phthalate or dioctyl sebacate;

the antioxidant is antioxidant 1010, antioxidant 245 or antioxidant 2103;

the composite flame retardant is prepared by the following method:

(1) washing chlorite with deionized water for 4-5 times, adding 1% titanate coupling agent and 5% stearic acid, stirring at 40 deg.C for 1h, taking out, washing with anhydrous alcohol repeatedly, and oven drying to obtain modified chlorite;

(2) mixing modified chlorite and molybdenum trioxide according to the mass ratio of 8-10:1, adding a certain amount of deionized water to form slurry (the addition amount of the deionized water is 3-4 times of the mass of the modified chlorite), putting the slurry into a ball milling tank, adding zirconia balls for ball milling for 12 hours at the ball milling speed of 600r/min, carrying out vacuum filtration on the slurry, and drying to obtain composite powder;

(3) putting 35mL of ethyl acetate and 50mL of absolute ethyl alcohol into a round-bottom flask, adding 4mg of p-aminophenyltrimethoxysilane, uniformly mixing, then adding 1.5g of composite powder, then putting the round-bottom flask into a paraffin bath at 120 ℃, refluxing for 20h under the stirring condition of 400r/min, after the reaction is finished, centrifugally washing for 6 times by using 95% of ethanol, drying for 12-14h in an oven at 90 ℃, taking out and grinding to obtain the composite flame retardant;

in the preparation process of the composite powder, molybdenum trioxide is subjected to ball milling hydrolysis to generate molybdate ions, and part of the molybdate ions enter the interlayer of chlorite to form eutectic crystals so as to form a perfect crystal structure and uniformly disperse the components; the chlorite can release a large amount of water vapor and CO₂The decomposition of PVC is delayed, HCl is absorbed by virtue of alkalinity, molybdenum trioxide in the PVC can promote HCl removal of the PVC, cis-polyene is isomerized into trans-polyene, the trans-polyene cannot be cyclized into an aromatic compound, the formation of benzene and aromatic compounds is inhibited, the smoke density is gradually reduced, the smoke suppression purpose is achieved, and the molybdenum trioxide can carbonize the PVC after combustion, isolate the contact between the inside unburned PVC and a heat source and air, prevent the PVC from continuing to combust and reduce the smoke generation amount;

in addition, the-NH on the p-aminophenyl trimethoxy silane is modified₂The silane-modified PVC composite material has the advantages that the silane-modified PVC composite material reacts with-OH on the surface of the composite powder, so that silane chains are grafted on the surface of the composite powder, the compatibility of the composite powder and a PVC matrix can be improved, a silicon-containing compound can be pyrolyzed at high temperature to generate silicon dioxide, the chemical stability is higher, the mechanical strength of a carbon layer can be enhanced, and the silicon dioxide can form a Si-O-Si net structure in the carbon layer, so that a ceramic-like structure is formed to cover the surface of the carbon layer, and the flame retardance is further improved; in addition, benzene rings on the silane chains have an anchoring effect, so that the spacing between PVC molecular chains can be increased, a plasticizing effect is achieved, and the impact resistance of the material is improved;

the stabilizer is prepared by the following method:

1) adding maleic anhydride and 2-phenyl-1, 3-propylene glycol in a molar ratio of 1:1 into a four-neck flask, introducing nitrogen for 15min in advance, putting the flask into an oil bath pot under the protection of the nitrogen, heating to 90 ℃ under the condition of mechanical stirring, and reacting for 110-120min under the condition of constant-temperature stirring at 90 ℃ to obtain an intermediate;

2) 10.5g of the intermediate was put into a four-necked flask, placed in an oil bath at 90 ℃, and 16.8g of a mixture of calcium acetate and zinc acetate (the mass ratio of calcium acetate to zinc acetate was 1.5: 1) after all the components are added, heating to 120 ℃, continuing to react for 2 hours, and after the reaction is finished, carrying out reduced pressure distillation until no liquid is distilled out to obtain a product;

3) uniformly mixing the product obtained in the step 2) with beta-diketone according to the mass ratio of 9:1 to obtain a stabilizer;

the C-C double bond structure in the maleic anhydride in the stabilizer can perform addition reaction with the conjugated polyene chain generated by heating the PVC long chain, so that the growth of the conjugated polyene chain is stopped to a certain extent, and the HCl release rate is delayed; secondly, hydroxyl which does not participate in the reaction in the 2-phenyl-1, 3-propylene glycol can generate a complex reaction with metal calcium/zinc ions, so that the autocatalysis effect of metal chloride on the PVC is inhibited; in addition, metal calcium/zinc ions in the stabilizer can absorb HCl to the maximum extent, and the stabilizer can absorb HCl in a neutralizing manner, prevent long-chain decomposition and self-catalysis, prolong induction time and further improve the stability of PVC; moreover, 2 carbonyl groups in the beta-diketone can form a stable chelate with metal chloride to replace allyl chloride, inhibit HCl removal, prevent initial coloring and prolong initial thermal stability, so that the stabilizer has good stability on PVC at different periods; benzene rings in the 2-phenyl-1, 3-propanediol in the stabilizer can also play a role in anchoring and improve the impact resistance of the material;

a preparation method of a flame-retardant data connecting line comprises the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, taking out the premix, crushing the premix into particles, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours;

and thirdly, adding the dried material into a machine barrel of a double-screw extruder for plasticizing and melting, extruding the melted material into a machine head die through a screw in the machine barrel, drawing the conductive core wire, passing through the machine head die of the double-screw extruder, coating the conductive core wire by the material to form a sheath layer after passing through the machine head die, and then sequentially carrying out water cooling and drying to obtain the data line.

Example 1

The utility model provides a fire-retardant data connecting wire, includes electrically conductive heart yearn and cladding in the restrictive coating on electrically conductive heart yearn surface, and wherein, the restrictive coating plays the guard action to electrically conductive heart yearn, and the restrictive coating is made by following part by weight raw materials: 50-60 parts of polyvinyl chloride (PVC), 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant;

the sheath layer material is prepared by the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

and secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, crushing into particles after sheet discharge, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours.

Example 2

The utility model provides a fire-retardant data connecting wire, includes electrically conductive heart yearn and cladding in the restrictive coating on electrically conductive heart yearn surface, and wherein, the restrictive coating plays the guard action to electrically conductive heart yearn, and the restrictive coating is made by following part by weight raw materials: 50-60 parts of polyvinyl chloride (PVC), 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant;

the sheath layer material is prepared by the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

and secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, crushing into particles after sheet discharge, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours.

Example 3

The utility model provides a fire-retardant data connecting wire, includes electrically conductive heart yearn and cladding in the restrictive coating on electrically conductive heart yearn surface, and wherein, the restrictive coating plays the guard action to electrically conductive heart yearn, and the restrictive coating is made by following part by weight raw materials: 50-60 parts of polyvinyl chloride (PVC), 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant;

the sheath layer material is prepared by the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

and secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, crushing into particles after sheet discharge, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours.

Comparative example 1

The composite flame retardant in example 1 was replaced with chlorite and molybdenum trioxide, and these two raw materials were directly added without any treatment, and the remaining raw materials and the preparation process were unchanged.

Comparative example 2

The stabilizer in the example 1 is replaced by a common Ca/Zn stabilizer, and the rest raw materials and the preparation process are not changed.

Comparative example 3

Pure PVC material.

The materials obtained in examples 1 to 3 and comparative examples 1 to 3 were processed into test specimens and subjected to the following performance tests:

testing the tensile property according to GB/T1040.2-2006; testing the impact performance according to GB/T1043.1-2008; the flame retardant performance is tested according to GB/T10707-2008; the smoke suppression performance is tested according to GB/T8323.1-2008;

as can be seen from the above table, the sheath materials obtained in examples 1 to 3 had tensile strengths of 56.6 to 57.8 and impact strengths of 60.2 to 61.2 kJ. m at 23 ℃ at room temperature^-2The impact strength at minus 25 ℃ is 6.1-6.3 kJ.m^-2The sheath layer prepared by the method has good mechanical property and can meet the use requirement of the data connecting line; the LOI value of the sheath layer material is 29.6-31.7%, the maximum smoke density is 215-220%, which shows that the sheath layer material prepared by the invention has good flame retardant and smoke suppression performances; by combining the comparative example 1, the added composite flame retardant is illustrated, and through the compounding and modification operation of chlorite and molybdenum trioxide, the flame retardant can be uniformly dispersed in a matrix, has the flame retardant and smoke suppression performance, can play a role in plasticization, and improves the impact resistance; compared with comparative example 2, the addition of the stabilizer of the invention not only can play a role in stabilizing, but also can plasticize PVC and improve the impact resistance; the sheath layer prepared by the invention has high flame-retardant and impact-resistant performance, and can effectively protect the core wire when being used for coating the conductive core wire, so that the data connecting wire can continuously work in a higher temperature environment, and the use safety of the data connecting wire is improved.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (5)

1. The utility model provides a fire-retardant data connecting wire, includes electrically conductive heart yearn and cladding in the restrictive coating on electrically conductive heart yearn surface, its characterized in that, the restrictive coating is made by following part by weight raw materials: 50-60 parts of polyvinyl chloride resin, 3-5 parts of composite flame retardant, 0.8-1 part of stabilizer, 4-6 parts of calcium carbonate, 8-10 parts of calcium stearate, 4-5 parts of plasticizer and 0.3-0.5 part of antioxidant;

the data connecting line is manufactured by the following steps:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, taking out the premix, crushing the premix into particles, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours;

and thirdly, adding the dried material into a machine barrel of a double-screw extruder for plasticizing and melting, extruding the melted material into a machine head die through a screw in the machine barrel, drawing the conductive core wire, passing through the machine head die of the double-screw extruder, coating the conductive core wire by the material to form a sheath layer after passing through the machine head die, and then sequentially carrying out water cooling and drying to obtain the data connecting wire.

2. The flame-retardant data link of claim 1, wherein the composite flame retardant is prepared by the following method:

(1) washing chlorite with deionized water for 4-5 times, adding 1% titanate coupling agent and 5% stearic acid, stirring at 40 deg.C for 1h, taking out, washing with anhydrous alcohol repeatedly, and oven drying to obtain modified chlorite;

(2) mixing modified chlorite and molybdenum trioxide according to the mass ratio of 8-10:1, adding a certain amount of deionized water to form slurry, putting the slurry into a ball milling tank, adding zirconia balls for ball milling for 12 hours at the ball milling speed of 600r/min, carrying out vacuum filtration on the slurry, and drying to obtain composite powder;

(3) putting 35mL of ethyl acetate and 50mL of absolute ethyl alcohol into a round-bottom flask, adding 4mg of p-aminophenyltrimethoxysilane, uniformly mixing, then adding 1.5g of composite powder, then putting the round-bottom flask into a paraffin bath at 120 ℃, refluxing for 20h under the stirring condition of 400r/min, after the reaction is finished, centrifugally washing for 6 times by using 95% of ethanol, drying for 12-14h in an oven at 90 ℃, taking out and grinding to obtain the composite flame retardant.

3. The flame retardant data link of claim 1 wherein said stabilizer is prepared by the process of:

1) adding maleic anhydride and 2-phenyl-1, 3-propylene glycol in a molar ratio of 1:1 into a four-neck flask, introducing nitrogen for 15min in advance, putting the flask into an oil bath pot under the protection of the nitrogen, heating to 90 ℃ under the condition of mechanical stirring, and reacting for 110-120min under the condition of constant-temperature stirring at 90 ℃ to obtain an intermediate;

2) putting 10.5g of the intermediate into a four-neck flask, putting the flask into an oil bath kettle at 90 ℃, slowly adding 16.8g of a mixture of calcium acetate and zinc acetate, heating to 120 ℃ after all the mixture is added, continuing to react for 2 hours, and distilling under reduced pressure after the reaction is finished until no liquid is distilled out to obtain a product;

3) uniformly mixing the product obtained in the step 2) with beta-diketone according to the mass ratio of 9:1 to obtain the stabilizer.

4. The flame retardant data link of claim 3 wherein the mass ratio of calcium acetate to zinc acetate in step 2) is 1.5: 1.

5. the preparation method of the flame-retardant data connecting line is characterized by comprising the following steps of:

firstly, putting calcium carbonate and calcium stearate into a ball mill for ball milling for 60-70min, putting the ball milled mixture, polyvinyl chloride resin, composite flame retardant, stabilizer, plasticizer and antioxidant into a high-speed mixer, and mixing for 20-30min at the temperature of 170 ℃ and at the speed of 500r/min to obtain a premix;

secondly, feeding the premix into a flat vulcanizing machine, carrying out hot pressing at the temperature of 180 ℃, then carrying out cold pressing at room temperature, taking out the premix, crushing the premix into particles, feeding the particles into a double-screw extruder, carrying out extrusion granulation, and drying at the temperature of 85 ℃ for 3-4 hours;

and thirdly, adding the dried material into a machine barrel of a double-screw extruder for plasticizing and melting, extruding the melted material into a machine head die through a screw in the machine barrel, drawing the conductive core wire, passing through the machine head die of the double-screw extruder, coating the conductive core wire by the material to form a sheath layer after passing through the machine head die, and then sequentially carrying out water cooling and drying to obtain the data line.