CN1259678A - Optical fiber secondary cocoon PBT special material - Google Patents
Optical fiber secondary cocoon PBT special material Download PDFInfo
- Publication number
- CN1259678A CN1259678A CN 00111650 CN00111650A CN1259678A CN 1259678 A CN1259678 A CN 1259678A CN 00111650 CN00111650 CN 00111650 CN 00111650 A CN00111650 A CN 00111650A CN 1259678 A CN1259678 A CN 1259678A
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- optical fiber
- pbt
- special material
- fiber secondary
- secondary cocoon
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- Polyesters Or Polycarbonates (AREA)
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Abstract
The present invention relates to the prodn. method of optical secondary coating PBT special material, its main characteristic is to add fluorescent whitener to general PBT resin, then proceed condensation polymerization to obtd. polybutylene terephthalate with good viscosity, low flow speed of baking body, high strength, narrow molecular weight distribution region that is optical fiber secondary coating PBT special material.
Description
The present invention is a kind of making optical fiber secondary cocoon PBT proprietary material.
Optical fiber secondary cocoon PBT special material has another name called the optical fiber loose tube engineering plastics.PBT (being Polybutylene terephthalate PBT or PBTP) formal name used at school is a polybutylene terephthalate.At present, the industrial method of this material has three kinds usually: i.e. ester-interchange method, esterification process and epoxyethane method, and commonly used be mainly preceding two kinds of methods, that is:
(1), ester-interchange method:
Utilize 1,4-butylene glycol and dimethyl terephthalate (DMT) (DMT) are carried out transesterification, generate the two hydroxy butyl esters of terephthalic acid (TPA), then at a certain temperature, carry out polycondensation reaction under the effect less than the vacuum tightness of 133 handkerchiefs and catalyzer, generate 1,4-butylene glycol and polybutylene terephthalate.Then, the polycondensation reaction product is carried out water-bath, cooling cast bar, pelletizing, dry, the polyester after drying is carried out drying and gets the PBT resin.The polymer stabilizing of producing in this way is relatively poor, and molecular weight is less, can not be directly used in the secondary coated of optical fiber.
(2), esterification process:
Utilize 1,4-butylene glycol and purified terephthalic are carried out the direct esterification reaction under the effect of normal pressure, high temperature (180 °-220 ℃) and catalyzer, generate the two hydroxy butyl esters of terephthalic acid (TPA) and accessory substance tetrahydrofuran and water, then in vacuum, under 240 °-250 ℃ temperature and catalyzer condition less than 133 handkerchiefs, carry out polycondensation reaction, generate polybutylene terephthalate and 1, the 4-butylene glycol carries out water-bath, cooling cast bar, pelletizing again, dry, final drying and the PBT resin.The PBT molecular resin amount of producing in this way is big, better heat stability, but its intensity is low, melt flow rate is high, limiting viscosity is low, can not be directly used in the secondary coated of optical fiber equally.
The technological process of above-mentioned two kinds of methods generally is divided into batch process and continuity method.Batch process is simple, can produce low, medium viscosity product, is applicable to small-scale production; Continuity method also can be produced and can produce low, medium viscosity product, is applicable to large-scale production.But the product that these two kinds of production methods are produced all can not directly use as cable material, can only be as some other purposes such as the remodeling of PBT resin or spinning.
In view of the above problems, the purpose of this invention is to provide a kind of new production method of optical fiber secondary cocoon PBT proprietary material of producing, the starting material in making it to produce are easy to get, and technological process is simple, easy to control, meet environmental protection requirement, product can satisfy the requirement of optical fiber secondary cocoon fully.
The objective of the invention is to be achieved through the following technical solutions:
(1), starting material adopt medium-sized PBT resin, its limiting viscosity is between 0.6-1.15di/g, roasting body flow rate was 15-75 gram/10 minutes; (2), production method: medium-sized PBT resin and fluorescent bleaches are added in the solid phase polycondensation still, under vacuum, decompression and hot conditions, carry out solid-phase polymerization; Under the high-temperature vacuum condition, moisture content, micromolecule and oligomer in the medium-sized PBT resin are extracted out through vacuum pump.Its solid state polycondensation temperature is 180 °-220 ℃, and vacuum tightness is-0.05--0.1Mpa, and the addition of fluorescent bleaches is 0.5-3.5/ ten thousand, and the time is 13-24 hour.After the reaction, qualified after testing, blowing naturally cools to 50 °-60 ℃, puts and get optical fiber secondary cocoon PBT special material in storage after screening is packed.
Adopt the optical fiber secondary cocoon PBT special material of said method and explained hereafter, its performance index have reached the level of similar imported product fully, some index, as: limiting viscosity, elastic modulus, flexural stress etc. are better than the import like product, cost is lower than imported product, is 25% of imported product.
Below in conjunction with embodiment, the production method of optical fiber secondary cocoon PBT special material of the present invention is further specified:
Embodiment 1:
When used raw materials for production are common PBT resin, limiting viscosity is chosen the reaction of homophase polycondensation vessel when 0.8-0.9di/g, and vacuum tightness is :-0.09--0.1Mpa, and temperature is 190 °-220 ℃, the time is to be advisable in 15-19 hour.Properties of product can satisfy the requirement of optical fiber secondary cocoon fully.
Embodiment 2:
When used raw materials for production are common PBT resin, limiting viscosity is chosen the reaction of homophase polycondensation vessel when 0.95-1.0di/g, and its vacuum tightness is :-0.085--0.095Mpa, and temperature is 190 °-215 ℃, the time is to be advisable in 14-18 hour.Properties of product reach the standard of use fully.
Embodiment 3:
When used raw materials for production are common PBT resin, limiting viscosity is chosen the reaction of homophase polycondensation vessel when 1.00-1.05di/g, and its vacuum tightness is :-0.07--0.08Mpa, and temperature is 190 °-210 ℃, the time is to be advisable in 13-15 hour.Properties of product can satisfy the requirement of optical fiber secondary cocoon fully.
Embodiment 4:
When used raw materials for production are common PBT resin, limiting viscosity is chosen the reaction of homophase polycondensation vessel when 1.05-1.15dl/g, and its vacuum tightness is :-0.05--0.06Mpa, and temperature is 180 °-200 ℃, the time is to be advisable in 13-14 hour.The properties of product of producing can reach the standard of use fully.
Claims (5)
1, a kind of optical fiber secondary cocoon PBT special material is characterized in that:
(1), starting material adopt: medium-sized PBT resin, its limiting viscosity are between 0.6-1.15di/g, and roasting body flow rate restrains/10 minutes at 15-75;
(2), production method is: medium-sized PBT resin and fluorescent bleaches are added in the solid phase polycondensation still, carry out solid-phase polymerization under vacuum, decompression and hot conditions; Under the high-temperature vacuum condition, moisture content, micromolecule and oligomer in the medium-sized PBT resin are extracted out through vacuum pump.
2, a kind of optical fiber secondary cocoon PBT special material according to claim 1, the temperature that it is characterized in that solid state polycondensation are 180 °-220 ℃.
3, a kind of optical fiber secondary cocoon PBT special material according to claim 1 is characterized in that the vacuum tightness of solid state polycondensation is-0.05-0.1Mpa.
4, a kind of optical fiber secondary cocoon PBT special material according to claim 1, the time that it is characterized in that solid state polycondensation is 13-24 hour.
5, a kind of optical fiber secondary cocoon PBT special material according to claim 1, the addition that it is characterized in that fluorescent bleaches is 0.5-3.5/ ten thousand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00111650 CN1259678A (en) | 2000-02-03 | 2000-02-03 | Optical fiber secondary cocoon PBT special material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00111650 CN1259678A (en) | 2000-02-03 | 2000-02-03 | Optical fiber secondary cocoon PBT special material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1259678A true CN1259678A (en) | 2000-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00111650 Pending CN1259678A (en) | 2000-02-03 | 2000-02-03 | Optical fiber secondary cocoon PBT special material |
Country Status (1)
| Country | Link |
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| CN (1) | CN1259678A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181135A (en) * | 2011-04-20 | 2011-09-14 | 江阴爱科森通信材料有限公司 | Polybutylene terephthalate (PBT) material special for optical cables and band cables and manufacturing method of PBT material |
| CN111440297A (en) * | 2020-05-25 | 2020-07-24 | 江苏和时利新材料股份有限公司 | Preparation method of modified polybutylene terephthalate with low precipitation and product thereof |
-
2000
- 2000-02-03 CN CN 00111650 patent/CN1259678A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181135A (en) * | 2011-04-20 | 2011-09-14 | 江阴爱科森通信材料有限公司 | Polybutylene terephthalate (PBT) material special for optical cables and band cables and manufacturing method of PBT material |
| CN102181135B (en) * | 2011-04-20 | 2012-06-27 | 江阴爱科森通信材料有限公司 | Polybutylene terephthalate (PBT) material special for optical cables and band cables and manufacturing method of PBT material |
| CN111440297A (en) * | 2020-05-25 | 2020-07-24 | 江苏和时利新材料股份有限公司 | Preparation method of modified polybutylene terephthalate with low precipitation and product thereof |
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