CN102731933B - Low shrinkage flame retardation PVC protective layer material used for indoor optical cable and its preparation method - Google Patents
Low shrinkage flame retardation PVC protective layer material used for indoor optical cable and its preparation method Download PDFInfo
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- CN102731933B CN102731933B CN201210211807.0A CN201210211807A CN102731933B CN 102731933 B CN102731933 B CN 102731933B CN 201210211807 A CN201210211807 A CN 201210211807A CN 102731933 B CN102731933 B CN 102731933B
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- pvc sheath
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
- B29C48/385—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in separate barrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Abstract
The invention relates to a low shrinkage flame retardation PVC protective layer material used for indoor optical cable, which is characterized in that a raw material formula is composed of PVC resin, a plasticizer a, a plasticizer b, a fire retardant a, fire retardant b, a filling material, a powerful powder, a heat stabilizer, an lubricant and a processing modifier. A preparation method comprises the following steps: 1) weighing materials according to weight part; 2) using a high speed kneader for heating the materials under high speed friction to the temperature of 140 DEG C, fully and uniformly mixing and preplasticizing; 3) extruding, mixing and plasticizing by using a double screw extruder set, wherein the set temperature range of the double screw extruder set is between 130-170 DEG C; 4) granulating by a single screw granulator, wherein the set temperature range of the single screw granulator is 100-130 DEG C; 5) cooling and sieving; and 6) packaging. The shrinkage of the PVC protective layer material can reach as low as 3%.
Description
Technical field
The present invention relates to a kind of inside cable low-shrinkage flame-proof PVC sheath material and preparation method thereof, belong to CABLE MATERIALS technical field.
Background technology
The flame-proof PVC sheath (sheath is also sheath, is coated on outer fiber) of inside cable in communication field (or claiming indoor flexible optical cable) plays the effect of protection optical fiber.For flame-proof PVC sheath, shrinking percentage (with 110 ℃, the radial shrinkage ratio detecting after 2h heating represents) is an important parameter weighing PVC sheath quality.Low-shrinkage is necessary, because if the shrinking percentage of optical cable PVC sheath is excessive, inner protected optical fiber will cause bending because of the contraction of outside PVC sheath, can make signal attenuation increase, and affects speed and the communication quality of communication.For shrinking percentage, the requirement at the commercial family of initial communication is to be not more than 5%, but has improved again standard afterwards, requires to be not more than 3%.
Flame-proof PVC sheath material at present common indoor flexible optical cable, what in formulating of recipe, mainly consider is that processing characteristics will be got well, when high speed thin-walled is extruded, guarantee extruded velocity and smooth surface, but the shrinking percentage of material is larger, and through thin-walled, extrude to add and be subject to again certain stretching man-hour, extruding stretches after cooling also there is string stress, and comprehensive action just makes the shrinking percentage of the flame-proof PVC sheath material of general room optical cable reach 8% left and right.On making, the formula of common flame-proof PVC sheath material is mainly: 100 parts of polyvinyl chloride resins, 38～50 parts, softening agent, 2～10 parts of stablizers, 3～9 parts of fire retardants, 25～35 parts, weighting material, 0.5～1 part of lubricating auxiliary agent.Adopting the performance such as mechanical property, flame retardant properties, low temperature of this type of flame-proof PVC sheath material of producing of formula is to meet the standard-required of indoor flexible optical cable to flame-proof PVC sheath material completely, but shrinking percentage cannot meet service requirements.This material is being carried out after optical cable as sheath material, when PVC sheath longitudinal contraction is larger, is coated on the optical fiber meeting flexural deformation in sheath, has a strong impact on communication quality.Some producer is for improving this kind of situation, when making, can suitably reduce the wherein amount of softening agent, to increase hardness, also have producer can increase filling proportion, for example the ratio of weighting material is increased to 60～70 parts, so that material contracts rate reduces, but the shrinking percentage of two kinds of way materials still can be in 4.5% left and right, still can not meet the shrinking percentage that user (communication business) proposes and be not more than 3% requirement.
Summary of the invention
The object of the invention is to provide a kind of inside cable low-shrinkage flame-proof PVC sheath material and preparation method thereof, and this flame-proof PVC sheath material radial shrinkage ratio is low to moderate 3%.
For achieving the above object, the technical solution used in the present invention is: low-shrinkage flame-proof PVC sheath material for a kind of inside cable, and composition of raw materials is mainly comprised of the material of following weight part:
100 parts of polyvinyl chloride resins;
4～15 parts of softening agent a;
35～45 parts of softening agent b;
3～6 parts of fire retardant a;
Fire retardant b 4～10;
10～40 parts of fillers;
20～30 parts, strong prestige powder;
4～8 parts of thermo-stabilizers;
0.5～1 part of lubricant;
2～4 parts of modifiers;
Wherein, described polyvinyl chloride resin is selected from the one in the polymerization degree 1000 type polyvinyl chloride resins, the polymerization degree 1300 type polyvinyl chloride resins, SG3 type polyvinyl chloride resin and SG4 type polyvinyl chloride resin;
Described softening agent a is epoxy soybean oil;
Described softening agent b is a kind of or at least two kinds of mixtures that mix with arbitrary proportion in dioctyl phthalate (DOP), dioctyl terephthalate, phthalic acid two (2-propyl group heptan) ester, trioctyl trimellitate;
Described fire retardant a is antimonous oxide;
Described fire retardant b is zinc borate or silicon magnesium fire retarding synergist;
Described filler is a kind of or at least two kinds of mixtures that mix with arbitrary proportion in calcium carbonate, talcum powder, aluminium hydroxide, magnesium hydroxide;
The lamella mean thickness of described strong prestige powder is 30～70nm;
Described thermo-stabilizer is calcium-zinc composite stabilizing agent;
Described lubricant is selected from a kind of or at least two kinds of mixtures that mix with arbitrary proportion in stearic acid, polyethylene wax, calcium stearate, Zinic stearas;
Described modifier is a kind of in acrylic polymer and alpha-methyl styrene or mixture that both mix with arbitrary proportion.
For achieving the above object, the second technical scheme that the present invention adopts is: a kind of method of preparing inside cable low-shrinkage flame-proof PVC sheath material, comprises the following steps:
1. weigh by weight each material;
2. use high-speed kneading machine each material to be warming up under high-speed friction to 140 degree, fully mix and preplasticizing;
3. use twin-screw extrusion unit to extrude mixing plasticizing, twin-screw extrusion unit design temperature scope is 130～170 ℃;
4. use single screw pelletizer granulation, single screw pelletizer design temperature scope is 100～130 ℃;
5. cooling sieving;
6. packing.
Related content in technique scheme is explained as follows:
1,, in such scheme, described " weight part " refers to take any weight as 1 part of content unit representing.
2,, in such scheme, described dioctyl phthalate (DOP) is called for short DOP.
3,, in such scheme, described dioctyl terephthalate is called for short DOTP.
4,, in such scheme, described phthalic acid two (2-propyl group heptan) ester is called for short DPHP.
5,, in such scheme, described trioctyl trimellitate is called for short TOTM.
6,, in such scheme, described acrylic polymer is called for short ACR.
7,, in such scheme, use the linear polymer ATL-95 of alpha-methyl styrene.
8, in such scheme, described strong prestige powder is surface treated nanoclay class silicate filler, can select the StronWi of CheeShine Chemicals (production firm)
tMthe strong prestige powder of TNK770.
9, in such scheme, described thermo-stabilizer calcium-zinc composite stabilizing agent can be selected German bear board BAEROPAN MC 9700 KA/1, the main component of calcium-zinc composite stabilizing agent is calcium stearate and Zinic stearas, not leaded or other heavy metal element, can prevent polyvinyl chloride decomposition at high temperature, there is superior patience.
10, in such scheme, described silicon magnesium fire retarding synergist is that Shanghai Liang Gao company produces the fire-retardant inorganic powder of nano level that the trade mark is T-409, main component is silicon, magnesium mixture, can significantly reduce the consumption of fire retardant a antimonous oxide, strengthen with consistency and the bonding force of plastics, viscosity reducing effect is large, can increase fill-up, improves reinforcement.
Because technique scheme is used, the present invention compared with prior art has following advantages and effect:
The present invention adds the strong prestige powder with nano material characteristic in flame-proof PVC sheath material, the nano-sheet structure that strong prestige powder is dispersed in mixture makes sheath material have excellent dimensional stability and ultralow shrinking percentage, after extrusion becomes inside cable sheath, the shrinking percentage that detects PVC sheath material is less than 2.5%; And complete processing is fine, smooth surface; In addition, nano material also can increase flame retardant effect, therefore also can obviously increase oxygen index and the flame retardant resistance of flame-proof PVC sheath material.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment: low-shrinkage flame-proof PVC sheath material and preparation method thereof for a kind of inside cable
One, composition of raw materials
The weight usage quantity umber of each component is in Table 1:
Table 1
Table 2 is concrete feed composition titles of using in embodiment:
Table 2
Two, preparation method
Comprise the following steps:
1. weigh by weight each material;
2. use high-speed kneading machine each material to be warming up under high-speed friction to 140 degree, fully mix and preplasticizing;
3. use twin-screw extrusion unit to extrude mixing plasticizing, twin-screw extrusion unit design temperature scope is 130～170 ℃;
4. use single screw pelletizer granulation, single screw pelletizer design temperature scope is 100～130 ℃;
5. cooling sieving;
6. packing.
Three, material behavior detects
By the embodiment of the present invention 1, 2, 3, 4 gained PVC sheath material products are produced as inside cable again, be specially: embodiment 1, 2, 3, 4 gained PVC sheath material products at screw diameter 45mm(as the case may be, also optional 30mm, 50mm, 70mm etc.) forcing machine inside cable production line on, temperature arranges 140～175 ℃, 80～120 ms/min of extruded velocities, produce inside cable, then detect, intercept the optical cable of 1m length, be positioned over the baking oven of 110 ℃ after 2 hours, taking-up is cooled to room temperature, detect the length of PVC flame-retardant sheath material, shrinkage from mold dimensions, the correlation data of acquired results compared with common flame-proof PVC sheath material in prior art is in Table 3:
Table 3
| Test subject | Unit | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | The common flame-proof PVC sheath of prior art material |
| Tensile strength | MPa | 20.4 | 23.1 | 21.8 | 20.6 | 22.0 |
| Elongation at break | % | 310 | 290 | 260 | 300 | 290 |
| Oxygen index | -- | 32.2 | 34.8 | 35.6 | 32.4 | 30.2 |
| Sheath material shrinking percentage | % | 2.5 | 2.2 | 2.0 | 2.3 | 8.1 |
As can be seen from Table 3, the inside cable of the embodiment of the present invention 1,2,3,4 gained PVC sheath material products productions, its tensile strength, the represented mechanical property of elongation at break change not quite compared with the common flame-proof PVC sheath of prior art material, the represented flame retardant resistance variation compared with the common flame-proof PVC sheath of prior art material of its oxygen index is also little, but shrinking percentage reduces greatly, reach below 2.5%, be better than the shrinking percentage of the common flame-proof PVC sheath of prior art material 8.1% far away.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that spirit is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. a low-shrinkage flame-proof PVC sheath material for inside cable, is characterized in that: composition of raw materials is mainly comprised of the material of following weight part:
Wherein, described polyvinyl chloride resin is selected from the one in the polymerization degree 1000 type polyvinyl chloride resins, the polymerization degree 1300 type polyvinyl chloride resins, SG3 type polyvinyl chloride resin and SG4 type polyvinyl chloride resin;
Described softening agent a is epoxy soybean oil;
Described softening agent b is a kind of or at least two kinds of mixtures that mix with arbitrary proportion in dioctyl phthalate (DOP), dioctyl terephthalate, phthalic acid two (2-propyl group heptan) ester;
Described fire retardant a is antimonous oxide;
Described fire retardant b is silicon magnesium fire retarding synergist;
Described filler is one or both mixtures that mix with arbitrary proportion in calcium carbonate, talcum powder;
The lamella mean thickness of described strong prestige powder is 30～70nm;
Described thermo-stabilizer is calcium-zinc composite stabilizing agent;
Described lubricant is selected from a kind of or at least two kinds of mixtures that mix with arbitrary proportion in stearic acid, polyethylene wax, calcium stearate, Zinic stearas;
Described modifier is a kind of in acrylic polymer and alpha-methyl styrene or mixture that both mix with arbitrary proportion.
2. a method of preparing the inside cable low-shrinkage flame-proof PVC sheath material of claim 1, is characterized in that: comprise the following steps:
1. weigh by weight each material;
2. use high-speed kneading machine each material to be warming up under high-speed friction to 140 degree, fully mix and preplasticizing;
3. use twin-screw extrusion unit to extrude mixing plasticizing, twin-screw extrusion unit design temperature scope is 130～170 ℃;
4. use single screw pelletizer granulation, single screw pelletizer design temperature scope is 100～130 ℃;
5. cooling sieving;
6. packing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210211807.0A CN102731933B (en) | 2012-06-26 | 2012-06-26 | Low shrinkage flame retardation PVC protective layer material used for indoor optical cable and its preparation method |
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| CN201210211807.0A CN102731933B (en) | 2012-06-26 | 2012-06-26 | Low shrinkage flame retardation PVC protective layer material used for indoor optical cable and its preparation method |
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| CN102731933A CN102731933A (en) | 2012-10-17 |
| CN102731933B true CN102731933B (en) | 2014-04-23 |
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| CN103073814B (en) * | 2012-12-13 | 2015-04-29 | 苏州亨利通信材料有限公司 | 105DEG C polyvinyl chloride insulation material for automotive wires |
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| CN105504594A (en) * | 2016-01-18 | 2016-04-20 | 重庆春光高分子材料有限公司 | Polyvinyl chloride plastic and preparation method thereof |
| CN106098216B (en) * | 2016-08-24 | 2017-08-29 | 嘉兴多角电线电缆有限公司 | A kind of digital communication and transmission cable |
| CN108072946A (en) * | 2017-11-21 | 2018-05-25 | 深圳市腾天昊宇光通信有限公司 | A kind of 8 shaped leather covered optical cable of self-bearing type and its processing method |
| CN108623948A (en) * | 2018-05-19 | 2018-10-09 | 曹小明 | Flame retardant type composite board |
| CN111944255A (en) * | 2020-07-29 | 2020-11-17 | 宜兴市鸿韵塑料有限公司 | High-resistance flame-retardant PVC cable sheath material |
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