Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of polyphenyl bracing benzodiazole and its used stirer

A technology of benzobisoxazole and poly-p-phenylene, which is applied in the field of preparation of high-molecular-weight poly-p-phenylene benzobisoxazole, and can solve the problem of excessively fast removal of HCl gas, climbing poles, and generation of foamed terephthalene. Formic acid particle size and other problems, to achieve the effect of eliminating poor mixing, improving mixing conditions and increasing molecular weight

Inactive Publication Date: 2006-07-19
DONGHUA UNIV +1
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the above-mentioned three problems in the preparation poly-p-phenylene benzobisoxazole process, i.e. the climbing rod problem of the reaction material in the later stage of the reaction, the problem that the HCl gas is removed too fast in the initial stage of the reaction and the problem of producing foam and paraphenylene Diformic acid particle size is too large

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of polyphenyl bracing benzodiazole and its used stirer
  • Preparation method of polyphenyl bracing benzodiazole and its used stirer
  • Preparation method of polyphenyl bracing benzodiazole and its used stirer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation Frame Single Helix Ribbon Stirrer

[0051] The parts of the stirrer matched with the cylindrical reaction kettle with a volume of 2000mL and a diameter D=125mm were prepared by using sus 316 stainless steel. The preparation of the frame top beam is to cut the sus 316 stainless steel plate into a frame top beam blank with a width of 12 mm, a thickness of 12 mm, and a length of 117 mm with a CNC machine tool, polish it on a grinding machine to a level 5 finish, and drill holes at both ends with a drilling machine. The distance between each hole is 106.5mm. The manufacture of the frame is to polish the sus 316 stainless steel round steel with a diameter of 6mm on a grinding machine to a grade 5 finish, and then bend it into a U shape with a height of 170mm and a width of 112.5mm with a punching machine. The manufacture of the spiral belt is to use a CNC machine tool to cut a 1mm thick sus 316 stainless steel plate into a ring with an opening, the inner diamete...

Embodiment 2

[0065] Preparation Frame Double Helix Ribbon Stirrer

[0066] The parts of the stirrer of the present invention are prepared by using sus 316 stainless steel. The preparation of the frame top beam is to cut the sus 316 stainless steel plate into a frame top beam blank with a width of 12 mm, a thickness of 12 mm, and a length of 105 mm with a CNC machine tool, polish it on a grinding machine to a level 5 finish, and drill holes at both ends with a drilling machine. The distance between each hole is 92.75mm. The manufacture of the frame is to polish the sus 316 stainless steel round steel with a diameter of 6mm on a grinding machine to a grade 5 finish, and then bend it into a U shape with a height of 170mm and a width of 98.75mm with a punching machine. The manufacture of the spiral belt is to use a CNC machine tool to cut a 1mm thick sus 316 stainless steel plate into a ring with an opening, the inner diameter of the ring is 98.75mm, and the width of the ring is 12.5mm, and t...

Embodiment 3

[0080] Preparation Frame Double Helix Ribbon Stirrer

[0081] The parts of the stirrer of the present invention are prepared by using sus 316 stainless steel. The preparation of the frame top beam is to cut the sus 316 stainless steel plate into a frame top beam blank with a width of 12 mm, a thickness of 12 mm, and a length of 105 mm with a CNC machine tool, polish it on a grinding machine to a level 5 finish, and drill holes at both ends with a drilling machine. The distance between each hole is 87.75mm. The manufacture of the frame is to polish the sus 316 stainless steel round steel with a diameter of 6mm on a grinding machine to a grade 5 finish, and then bend it into a U shape with a height of 170mm and a width of 93.75mm with a punching machine. The manufacture of the spiral belt is to use a CNC machine tool to cut a 1mm thick sus 316 stainless steel plate into a ring with an opening, the inner diameter of the ring is 93.75mm, and the width of the ring is 10mm, and the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
tensile strengthaaaaaaaaaa
modulusaaaaaaaaaa
Login to View More

Abstract

A process for preparing poly-p-phenylene benzodioxazole (PBO) includes adding 4,6-diaminoresorcin hydrochloride, polyphosphoric acid and terephthalic acid to a cylindrical reactor with a special stirrer, stirring at 50-65 deg.C for 2 hr, reacting at 110-120 deg.C under 0.2-1.0 MPa of inertial gas for 5-7 hr, heating to 140-150 deg.C, reacting under vacuum for 6-7 hr, and reacting at 180-190 deg.C under orinary pressure for 12-15 hr. It features that in the whole reaction procedure, the stirring speed is gradually lowered. Said stirrer is composed of a U-shaped frame, a top beam and a spiral belt. Its advantages are high molecular weight and short reaction time.

Description

field of invention [0001] The invention relates to a method for preparing poly-p-phenylene benzobisoxazole (PBO), more specifically, the invention relates to a method for preparing high-molecular weight poly-p-phenylene benzobisoxazole. background of the invention [0002] Poly-p-phenylenebenzobisoxazole (PBO) is a raw material for preparing high-performance fibers. Its tensile strength can reach 5.8GPa, its modulus can reach 300GPa, its heat resistance and flame retardancy are also very good, and its thermal decomposition temperature can reach 650°C. , LOI up to 68. [0003] The polymerization of poly-p-phenylenebenzobisoxazole is carried out in polyphosphoric acid (PPA) medium with 4,6-diaminoresorcinol hydrochloride (DAR) and terephthalic acid (TPA) as raw materials realized by condensation. The reaction formula is as follows: [0004] [0005] The whole polymerization process is divided into two stages, firstly, 4,6-diaminoresorcinol hydrochloride monomer removes H...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/22B01F7/22B01F27/91
Inventor 李光江建明金俊弘杨胜林
Owner DONGHUA UNIV