CN102952312A - Special anti-bonding low-smoke halogen-free flame-retardant sheath material for GJFJZY type multi-core indoor optical cable - Google Patents

Abstract

The invention discloses a special anti-bonding low-smoke halogen-free flame-retardant sheath material for a GJFJZY type multi-core indoor optical cable. The sheath material comprises the following components in parts by weight: 5-15 parts of ethylene-vinyl acetate copolymer (EVA), 10-20 parts of polyethylene (PE), 5-10 parts of polypropylene (PP), 55-65 parts of flame retardant, 5-10 parts of compatilizer, 2-3 parts of ultra-high molecular weight silicone, 0.5-1.5 parts of high-melting-point polyethylene wax and 0.3-0.8 part of antioxidant. The PE and the PP having high melting points are used as base materials; a small amount of EVA is further used; the flame retardant is added to achieve the flame-retardant effect; meanwhile, the ultra-high molecular weight silicone is used as internal and external lubricant to improve the material flowability and the powder dispersion effect, the use amount is increased, and the ultra-high molecular weight ensures that no precipitation exists in resin; the high-melting-point polyethylene wax is further used as external lubricant, and the high melting point ensures that sufficient lubrication action exists at high temperature and no precipitation exists on the surface early at low temperature so as to further avoid inactivation, thus realizing that a thin wax layer is formed between a core wire and a sheath layer in the extruding process at about 160 DEG C and serves as an isolating layer; and the core wire and the sheath layer disclosed by the invention have great difference in material, thereby finally ensuring that the both can not be bonded together. Thus, the normal use of a GJFJZY type multi-core optical cable is ensured.

Description

The special-purpose antiblocking low-smoke halogen-free flame-retardant sheath of GJFJZY type Multi-core indoor optical cable material

technical field

the present invention relates to GJFJZY type Multi-core indoor optical cable special sheath material.

Background technology

what present GJFJZY type Multi-core indoor optical cable heart yearn was used is low-smoke halogen-free material; restrictive coating is also used same low-smoke halogen-free material; heart yearn is again without cabling process; unprotect layer between heart yearn and sheath; in the extrusion of 160 ℃ of left and right, heart yearn is easy to be bonded together with restrictive coating like this, and in cooling contraction or use procedure, heart yearn or restrictive coating separate like this; cause restrictive coating or heart yearn breakage, affect fiber-optic signal degree of decay or work-ing life.Heart yearn is easy to be bonded together with restrictive coating, this is mainly because restrictive coating is the same with the heart yearn material or too close, at high temperature consistency is fine causes for the two, the low smoke and zero halogen material of present restrictive coating or heart yearn is mainly used EVA, the PE resinoid of polyolefins, and EVA accounts for more than 60% (weight percent) of overall resin, if make the performance difference of restrictive coating or heart yearn very large, or not compatible under high temperature, can not cause that the situation of adhesion occurs.

Summary of the invention

the special-purpose low-smoke halogen-free flame-retardant sheath material of GJFJZY type Multi-core indoor optical cable that the purpose of this invention is to provide antiblocking.

for achieving the above object, the technical solution used in the present invention is: the special-purpose antiblocking low-smoke halogen-free flame-retardant sheath of GJFJZY type Multi-core indoor optical cable material, the component in this sheath material and content by weight are

ethylene-vinyl acetate copolymer 5-15

polyethylene 10-20

polypropylene 5-10

fire retardant 55-65

compatilizer 5-10

ultra-high molecular weight silicone 2-3

high melting point polyethylene wax 0.5-1.5

oxidation inhibitor 0.3-0.8;

described fire retardant is selected one or more the combination in aluminium hydroxide, magnesium hydroxide, zinc borate, ammonium polyphosphate, and the particle diameter of described aluminium hydroxide, described magnesium hydroxide is 1 ~ 3 μ m;

described compatilizer is selected a kind of in ethylene-vinyl acetate copolymer grafted maleic anhydride multipolymer, ethene grafted maleic anhydride multipolymer;

described ultra-high molecular weight silicone is for take the ultra-high molecular weight siloxanes that polyethylene is carrier, and the siloxane molecule amount is more than 2,000,000;

described high melting point polyethylene wax is that fusing point is at the polyethylene wax more than 105 ℃;

described oxidation inhibitor is selected four [3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, 4,4 '-thiobis (the 6-tertiary butyl-3-methylphenol), Tyox B, (2, the 4-di-tert-butyl-phenyl) tris phosphite, β, the combination of a kind of in β '-sulfuration dipropionic acid SUNSOFT Q-182S or two kinds.

utilization due to technique scheme, the present invention compared with prior art has following advantages: in restrictive coating material of the present invention, adopt the higher polyethylene of fusing point, polypropylene is as base-material, match a small amount of ethylene-vinyl acetate copolymer, and the interpolation fire retardant reaches flame retardant effect, adopt the ultra-high molecular weight silicone to improve material flowability and powder dispersion effect as inside and outside lubricant agent simultaneously, and component is used in increase, ultra-high molecular weight guarantees that it does not separate out in resin, match high melting point polyethylene wax as outer lubricated, high-melting-point guarantees that it at high temperature can play enough lubrications, cause inefficacy and be unlikely at low temperatures the too early surface that precipitate into, just have like this wax that one deck is very thin between heart yearn and restrictive coating as sealing coat in the extrusion of 160 ℃ of left and right, again due to heart yearn and restrictive coating materials variances of the present invention larger, finally cause the two can not be sticked together, thereby guaranteed the normal use of GJFJZY type multifiber cable.

Embodiment

below further set forth the present invention.

the present invention, by changing the material component of restrictive coating, makes heart yearn and restrictive coating performance difference large, incompatible, thereby solves the problem of heart yearn and restrictive coating bonding.Superincumbent " background technology " part is mentioned, and at present the low smoke and zero halogen material of heart yearn is mainly used EVA, the PE resinoid of polyolefins, and EVA accounts for more than 60% (weight percent) of overall resin, and EVA is ethylene-vinyl acetate copolymer, and PE is polyethylene.It is base-material that restrictive coating material of the present invention mainly be take PE, PP mixture, be aided with EVA, PP is polypropylene, PE, PP resinoid account for overall resin than about 65%-75%(weight percent), and be used in conjunction with ultra-high molecular weight silicone and high melting point polyethylene wax, from resin and lubricated two aspects improved restrictive coating and heart yearn low-smoke halogen-free material extrude with use procedure adhesion phenomenon.

specifically, component in restrictive coating material of the present invention and content by weight are ethylene-vinyl acetate copolymer (EVA) 5-15, polyethylene (PE) 10-20, polypropylene (PP) 5-10, fire retardant 55-65, compatilizer 5-10, ultra-high molecular weight silicone 2-3, high melting point polyethylene wax 0.5-1.5, oxidation inhibitor 0.3-0.8, fire retardant is selected aluminium hydroxide, magnesium hydroxide, zinc borate, the combination of one or more in ammonium polyphosphate, and aluminium hydroxide, the particle diameter of magnesium hydroxide is 1 ~ 3 μ m, guaranteed so the good flame retardant properties of restrictive coating material, because the consistency of EVA and PE, PP, fire retardant is bad, therefore adopt compatilizer to improve the consistency of resin, inorganic combustion inhibitor, compatilizer is selected a kind of in ethylene-vinyl acetate copolymer grafted maleic anhydride multipolymer, ethene grafted maleic anhydride multipolymer, the ultra-high molecular weight silicone is for take the ultra-high molecular weight siloxanes that polyethylene is carrier, and the siloxane molecule amount is more than 2,000,000, high melting point polyethylene wax be fusing point at the polyethylene wax more than 105 ℃, ultra-high molecular weight silicone and high melting point polyethylene wax all play a part lubricated, oxidation inhibitor is selected four [3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, 4,4 '-thiobis (the 6-tertiary butyl-3-methylphenol), Tyox B, (2, the 4-di-tert-butyl-phenyl) tris phosphite, β, the combination of a kind of in β '-sulfuration dipropionic acid SUNSOFT Q-182S or two kinds, the antioxygenation of oxidation inhibitor can reduce the aging speed of restrictive coating material.

in restrictive coating material of the present invention, adopt the higher PE of fusing point, PP, match a small amount of EVA, and the interpolation fire retardant reaches flame retardant effect, adopt the ultra-high molecular weight silicone of external import to improve material flowability and powder dispersion effect as inside and outside lubricant agent simultaneously, and component is used in increase, ultra-high molecular weight guarantees that it does not separate out in resin, match the high melting point polyethylene wax of external import as outer lubricated, high-melting-point guarantees that it at high temperature can play enough lubrications, cause inefficacy and be unlikely at low temperatures the too early surface that precipitate into, just have like this wax that one deck is very thin between heart yearn and restrictive coating as sealing coat in the extrusion of 160 ℃ of left and right, again due to heart yearn and restrictive coating materials variances of the present invention larger, finally cause the two can not be sticked together.Optical cable in use, under 80 ℃ of temperature ratings, use, due to the fusing point of polyethylene, polypropylene base-material in restrictive coating far above this temperature, and between restrictive coating and heart yearn, polyethylene wax not yet melts, so even melting of EVA also is unlikely to restrictive coating and heart yearn is bonded together, thereby guaranteed the phenomenon that GJFJZY type multifiber cable not there will be heart yearn and restrictive coating to be bonded together in normal use procedure yet, guaranteed the normal use of optical cable.

when preparation restrictive coating material of the present invention, the material component of restrictive coating is pressed to corresponding proportioning: ethylene-vinyl acetate copolymer 5-15, polyethylene 10-20, polypropylene 5-10, fire retardant 55-65, compatilizer 5-10, ultra-high molecular weight silicone 2-3, high melting point polyethylene wax 0.5-1.5, oxidation inhibitor 0.3-0.8, add in milling machine, carry out mixing, about 8-12min of time, during melting temperature to 135 ℃-150 ℃, Bitruder is sent in discharging, through twin screw, plastify, again through single screw rod granulation, the screw zones temperature is as follows: feeding section 90-110 degree centigrade, transportation section 120-130 degree centigrade, fluxing zone 130-140 degree centigrade, head temperature 135-145 degree centigrade, granulation adopts air-cooled fervent technique, be drying to obtain again finished product after making particle.The restrictive coating material made like this is as a kind of novel material, large with the performance difference of heart yearn material, and by the ultra-high molecular weight silicone in the restrictive coating material and the lubrication of high melting point polyethylene wax, make restrictive coating and heart yearn adhesion, guarantee the quality of GJFJZY type Multi-core indoor optical cable.

Claims (1)

1.GJFJZY the special-purpose antiblocking low-smoke halogen-free flame-retardant sheath of type Multi-core indoor optical cable material is characterized in that: the component in this sheath material and content by weight are

Ethylene-vinyl acetate copolymer 5-15

Polyethylene 10-20

Polypropylene 5-10

Fire retardant 55-65

Compatilizer 5-10

Ultra-high molecular weight silicone 2-3

High melting point polyethylene wax 0.5-1.5

Oxidation inhibitor 0.3-0.8;

Described fire retardant is selected one or more the combination in aluminium hydroxide, magnesium hydroxide, zinc borate, ammonium polyphosphate, and the particle diameter of described aluminium hydroxide, described magnesium hydroxide is 1 ~ 3 μ m;

Described compatilizer is selected a kind of in ethylene-vinyl acetate copolymer grafted maleic anhydride multipolymer, ethene grafted maleic anhydride multipolymer;

Described ultra-high molecular weight silicone is for take the ultra-high molecular weight siloxanes that polyethylene is carrier, and the siloxane molecule amount is more than 2,000,000;

Described high melting point polyethylene wax is that fusing point is at the polyethylene wax more than 105 ℃;

Described oxidation inhibitor is selected four [3-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, 4,4 '-thiobis (the 6-tertiary butyl-3-methylphenol), Tyox B, (2, the 4-di-tert-butyl-phenyl) tris phosphite, β, the combination of a kind of in β '-sulfuration dipropionic acid SUNSOFT Q-182S or two kinds.