CN1286882C - Method for preparing polybenzoxazole - Google Patents
Method for preparing polybenzoxazole Download PDFInfo
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- CN1286882C CN1286882C CN 200510026800 CN200510026800A CN1286882C CN 1286882 C CN1286882 C CN 1286882C CN 200510026800 CN200510026800 CN 200510026800 CN 200510026800 A CN200510026800 A CN 200510026800A CN 1286882 C CN1286882 C CN 1286882C
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- terephthalic acid
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Abstract
The present invention relates to a preparation method of polybenzoxazole, which belongs to the field of chemical industry. Terephthalic acid and 4, 6-diaminoresorcinol dihydrochloride are directly neutralized in acidity and basicity into 4, 6-diaminoresorcinol/terephthalic acid compound salt, and phosphorus pentoxide is directly added into the system to polymerize the 4, 6-diaminoresorcinol/terephthalic acid compound salt to obtain the polybenzoxazole. In the present invention, the 4, 6-diaminoresorcinol/terephthalic acid compound salt is used as a raw material through a polycondensation reaction. The method is characterized in that the solid 4, 6-diaminoresorcinol dihydrochloride is directly added into the reaction system to carry out a salt forming reaction, the polymerization reaction system is directly prepared without washing nor drying the compound salt obtained through acidity-basicity neutralization to greatly save the time, and hydrogen chloride elimination is also omitted in the polymerization process so that a plurality of disadvantages caused by the process of the degassing of the hydrogen chloride to the polycondensation reaction are overcome.
Description
Technical field
The present invention relates to a kind of preparation method of polymkeric substance of chemical field, specifically, is a kind of preparation method of polybenzoxazole.
Background technology
The abbreviation of pbo fiber-cis polyparaphenylene Ben Bing Er oxazole (Cis-Polyparaphenylene benzobi-soxazole, abbreviation PBO) fiber.The 575kg/cm that this fiber had
2Tensile strength and 28000kg/cm
2Initial modulus, 68 limiting oxygen index(LOI) LOI value and 650 ℃ main performance index such as decomposition temperature, all belong to organic at present and inorganic fibre, the 12-14 that its specific tenacity is about steel doubly, specific modulus is 1.4 times of steel, and proportion is 1.52-1.55g/cm
2Has only 1/5 of steel.Owing to its superior performance, promptly be regarded as the super fiber of new generation of advanced configuration matrix materials such as aerospace and military affairs from an appearance.PBO adopts 4, and 6-diamino resorcin hydrochlorate and terephthalic acid (TA) are with polyphosphoric acid (PPA) and Vanadium Pentoxide in FLAKES (P
2O
5) make for solvent carries out solution polycondensation.Wherein PPA is a solvent, also is polycondensation catalyst.Synthetic route:
Whole polymerization process is divided into two stages, at first is 4, and 6-diamino resorcin hydrochlorate monomer removes HCl, prepares the PBO slurries with certain viscosity with terephthalic acid by polycondensation then, by dry-jet wet-spinning, prepares pbo fiber then.Exist the deficiency of the following aspects in this method: the first: 4, the 6-diamino resorcin hydrochlorate removes in the process of hydrochloric acid will emit a large amount of hydrogen chloride gas, these gases can produce a large amount of foams in the heavy-gravity reaction solution, thereby have reduced the stirring efficiency of reaction system.Second: hydrogenchloride is severe corrosive gas, and this makes that reaction is very high for the requirement of equipment and materials, and degasification technique has taken a large amount of time.The 3rd: in the process of dehydrochlorination gas, a large amount of foams of generation make 4, and the 6-diamino resorcin hydrochlorate sticks on the reactor wall, have destroyed two kinds of mol ratios such as monomeric, have seriously influenced the final molecular weight of polymkeric substance.The 4th, it is very difficult removing hydrochloric acid in the prior art fully, so the common employing of Vanadium Pentoxide in FLAKES is the mode that distributes and add, in order to be easy to the degassing, the temperature of reaction system is raise, yet, under hot conditions, can cause side reaction to increase, be unfavorable for the increase of molecular weight.
Find through literature search prior art, U.S. Pat 5276128 has been reported a kind of way that overcomes the problems referred to above, be about to the aqueous solution that terephthalic acid is mixed with the terephthalic acid sodium salt, 4, the 6-diamino resorcin hydrochlorate is mixed with the aqueous solution, and by the acid-base neutralisation reaction, filtration, washing and drying prepare 4,6-diamino resorcin/terephthalate carries out polyreaction then.The shortcoming of this method is: the first, 4, and 6-diamino resorcin hydrochloric acid ratio is easier to oxidation, and therefore in obtained aqueous solution, water need and will be used nitrogen protection with oxygen-free water; The second, by after the acid-base neutralisation, need filtration washing, make preparedly 4 like this, 6-diamino resorcin/terephthalate is exposed in the air oxidized easily, and need be dry under vacuum condition, takes time and effort.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of preparation method of polybenzoxazole is provided, make it be modified into salt technology, directly with solid 4, the 6-diamino resorcin hydrochlorate joins and is carried out to reactant salt in the reaction system, and water need and will be used nitrogen protection with oxygen-free water when having avoided obtained aqueous solution; Need not and to wash and drying by the composite salt that acid-base neutralisation obtains, saved the time, also saved and removed hydrogenchloride, thereby overcome the problem that exists in the background technology.
The present invention is achieved by the following technical solutions, the present invention is with terephthalic acid and 4, the 6-diamino resorcin hydrochlorate directly becomes 4 by acid-base neutralisation, 6 diamino resorcins/terephthalic acid composite salt, in this system, directly add Vanadium Pentoxide in FLAKES and carry out 4, the polymerization of 6 diamino resorcins/terephthalic acid composite salt prepares polybenzoxazole.
Described with terephthalic acid and 4, the 6-diamino resorcin hydrochlorate directly becomes 4,6 diamino resorcins/terephthalic acid composite salt by acid-base neutralisation, and is specific as follows:
Terephthalic acid is mixed with the aqueous solution of terephthalic acid sodium salt; under nitrogen protection; with solid 4; the 6-diamino resorcin hydrochlorate directly adds in the aqueous solution of disodium terephthalate; go out 4 by the acid-base neutralisation prepared in reaction; 6 diamino resorcins/terephthalate promptly obtain 4,6 diamino resorcins/terephthalate after filtering, washing.
Described 4, the 6-diamino resorcin hydrochlorate is to add with solid, rather than 4, the aqueous solution of 6-diamino resorcin hydrochlorate.
4,6 diamino resorcins/terephthalate need not by filtration, washing back, polycondensation forms in the solution of polyphosphoric acid, be mixed with polyphosphoric acid and carry out polymerization but in system, directly add Vanadium Pentoxide in FLAKES, saved a large amount of aftertreatment time, simplified preparation technology.
The present invention is a raw material with 4,6 diamino resorcins/terephthalic acid composite salt, by polycondensation, prepares polybenzoxazole.Its characteristics: (1) need not 4, and the 6-diamino resorcin hydrochlorate is mixed with the aqueous solution, but directly with solid 4, the 6-diamino resorcin hydrochlorate joins in the reaction system, is carried out to reactant salt.(2) need not the composite salt that obtains by acid-base neutralisation washed and dry but directly be mixed with polymerization reaction system, save time greatly, in polymerization process, also saved and removed hydrogenchloride, thereby overcome many defectives that the hydrogenchloride degasification process causes polycondensation.
The present invention has replaced 4 with 4,6 diamino resorcins/terephthalic acid composite salt, and 6-diamino resorcin hydrochlorate and terephthalic acid carry out polyreaction, realize that salify-polymerization is integrated, simplify reaction process, saved the loaded down with trivial details aftertreatment technology of composite salt, improved efficient.
Embodiment
Below in conjunction with embodiment the present invention is further set forth
Terephthalic acid 32.55 grams and sodium hydroxide 15.68 grams are dissolved in the water of 160ml, prepare the terephthalic acid sodium water solution.Under nitrogen atmosphere and 80 ℃, with 41.76 grams 4, the 6-diamino resorcin hydrochlorate joined in the terephthalic acid sodium water solution in 15 minutes, had a large amount of white precipitates to occur.Then in this system, add 235.63 gram Vanadium Pentoxide in FLAKESs, reacted 2 hours down at 100 ℃, reacted 10 hours down at 120 ℃, in 3 hours, temperature is elevated to 150 ℃, under this temperature, react after 5 hours, reacted 3 hours down at 180 ℃, obtained having the yellow-green colour PBO slurries that stir fluorescence, this polymkeric substance that takes a morsel is dissolved in methylsulphonic acid, and to be mixed with concentration be the solution of 0.02-0.05g/dl and to measure its limiting viscosity under 30 ℃ be 41.2dL/g.
The PBO slurries that polymerization is obtained are as spinning solution (concentration of polymkeric substance is 14.0%), by twin screw extruder the PBO slurries are mediated and the degassing after, under 170 ℃, with toothed gear pump it is sent in the spinning top, be about 20 millimeters particles filled layer back at the spinning top place by the bed thickness of forming by inorganic substance and arrive spinning jet (60 holes, the aperture is 0.23 millimeter) in, after with 80 meters/minute speed spun PBO strand being stretched, introduce in the precipitation bath, flush away polyphosphoric acid in precipitation bath, by up-coiler, the PBO strand is reeled, and further wash and drying.Its fibre number is 4.66dtex, and intensity is 32.69CN/dtex, and modulus is 821.4CN/dtex.
Below be the comparative example: two-step approach prepares polybenzoxazole
With 34 grams 4, the 6-diamino resorcin hydrochlorate is dissolved in the water about 120ml, prepares 4, the aqueous solution of 6-diamino resorcin hydrochlorate.Terephthalic acid 27.12 grams and sodium hydroxide 17.32 grams are dissolved in the water of 150ml, prepare the terephthalic acid sodium water solution.Under nitrogen atmosphere, aqueous terephthalic acid solution is heated to 80 degree, under this temperature, will contain 34 grams 4, the aqueous solution of 6-diamino resorcin hydrochlorate was added dropwise in the aqueous solution of para-phthalic sodium in 10 minutes, had a large amount of white precipitates to occur.White precipitate is filtered, washing, drying obtains 46 gram white powders, and productive rate is 92.0%.
With 40 gram synthetic TA salt, 133.77 gram polyphosphoric acid (phosphorus pentoxide content 84%) and 44 gram Vanadium Pentoxide in FLAKESs are put into polymerization reaction kettle, violent stirring, reacted 2 hours down at 100 ℃, reacted 10 hours down at 120 ℃, in 3 hours, temperature is elevated to 150 ℃, under this temperature, react after 5 hours, reacted 3 hours down at 180 ℃, obtained having the yellow-green colour PBO slurries that stir fluorescence, this polymkeric substance that takes a morsel is dissolved in methylsulphonic acid, and to be mixed with concentration be the solution of 0.02-0.05g/dl and to measure its limiting viscosity under 30 ℃ be 32.5dL/g.
By above contrast as can be seen: the present invention is directly with solid 4, and the 6-diamino resorcin hydrochlorate joins in the reaction system, is carried out to reactant salt, has avoided the time water of obtained aqueous solution and will use nitrogen protection with oxygen-free water; Need not and will wash and dry but directly be mixed with polymerization reaction system, in polymerization process, also saved and removed hydrogenchloride by the composite salt that acid-base neutralisation obtains, time saving and energy saving.
Claims (3)
1, a kind of preparation method of polybenzoxazole, it is characterized in that, with terephthalic acid and 4, the 6-diamino resorcin hydrochlorate directly becomes 4 by acid-base neutralisation, 6 diamino resorcins/terephthalic acid composite salt, in this system, directly add Vanadium Pentoxide in FLAKES and carry out the polymerization of 4,6 diamino resorcins/terephthalic acid composite salt, prepare polybenzoxazole.
2, the preparation method of polybenzoxazole according to claim 1 is characterized in that, and is described with terephthalic acid and 4, and the 6-diamino resorcin hydrochlorate directly becomes 4,6 diamino resorcins/terephthalic acid composite salt by acid-base neutralisation, and is specific as follows:
Terephthalic acid is mixed with the aqueous solution of terephthalic acid sodium salt; under nitrogen protection; with solid 4; the 6-diamino resorcin hydrochlorate directly adds in the aqueous solution of disodium terephthalate; go out 4 by the acid-base neutralisation prepared in reaction; 6 diamino resorcins/terephthalate promptly obtain 4,6 diamino resorcins/terephthalate after filtering, washing.
3, according to the preparation method of claim 1 or 2 described polybenzoxazoles, it is characterized in that, in system, directly add Vanadium Pentoxide in FLAKES and be mixed with polyphosphoric acid and carry out polymerization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510026800 CN1286882C (en) | 2005-06-16 | 2005-06-16 | Method for preparing polybenzoxazole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510026800 CN1286882C (en) | 2005-06-16 | 2005-06-16 | Method for preparing polybenzoxazole |
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| CN1709942A CN1709942A (en) | 2005-12-21 |
| CN1286882C true CN1286882C (en) | 2006-11-29 |
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| CN 200510026800 Expired - Fee Related CN1286882C (en) | 2005-06-16 | 2005-06-16 | Method for preparing polybenzoxazole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423986B (en) * | 2008-12-12 | 2010-12-22 | 北京特斯顿新材料技术发展有限公司 | Method for preparing polybenzazole fiber |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441615C (en) * | 2006-09-05 | 2008-12-10 | 东华大学 | Preparation method of polybenzoxazole thin film |
| CN101914204B (en) * | 2010-06-17 | 2012-09-12 | 大连理工大学 | Polybenzoxazole based on dihydroxy diamine containing phthalazinone structure and preparation method thereof |
| CN102260932A (en) * | 2011-07-05 | 2011-11-30 | 深圳市中晟创新科技股份有限公司 | Preparation method of polyparaphenylene benzobisoxazole (PBO) fiber |
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2005
- 2005-06-16 CN CN 200510026800 patent/CN1286882C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423986B (en) * | 2008-12-12 | 2010-12-22 | 北京特斯顿新材料技术发展有限公司 | Method for preparing polybenzazole fiber |
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| CN1709942A (en) | 2005-12-21 |
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