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A kind of ternary light-resistant liquid crystal copolymer containing imidoxazole structure and its preparation and application

A technology containing imoxazole and copolymers, applied in the direction of conjugated synthetic polymer rayon, liquid crystal materials, single-component synthetic polymer rayon, etc., can solve the problems of slow development, low heat resistance temperature PBO, and low strength and other problems, to achieve the effect of short polymerization time, high heat resistance and low density

Active Publication Date: 2022-05-13
宁夏瑞鼎科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the quality of its key monomer TABP, especially the high price, and the heat resistance temperature is 100 ° C lower than that of PBO and the strength is low, the development is very slow.

Method used

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  • A kind of ternary light-resistant liquid crystal copolymer containing imidoxazole structure and its preparation and application
  • A kind of ternary light-resistant liquid crystal copolymer containing imidoxazole structure and its preparation and application
  • A kind of ternary light-resistant liquid crystal copolymer containing imidoxazole structure and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 O 4 -PBO-ABPBI (poly-2,5-benzoxazole-p-phenylenebenzobisoxazole-benzimidazole) and its monofilament fibers

[0075]

[0076] Sequentially add P into the glass polymerization reaction column 2 o 5 Mass concentration is 20.0g of polyphosphoric acid (PPA) of 85.65%, turn on spiral stirring, and heat up 150 ℃ and control the rotating speed stirring of 350r / min, pass N 2 Slowly add 5.0266g of a mixture of three AB-type monomers (AHBA 0.860g, ABAA 1.613g, DABA 2.563g, (mol ratio 1:1:3, mass ratio 0.17:0.32:0.51) under protection for 3min, and add for 1h Stir and heat up to 168°C to show fluorescence (liquid crystal state after 20 minutes), finally control the temperature between 170-180°C, and then polymerize for 1 hour to form filaments, until the speed drops significantly to 200r / min or below, the polymerization reaction is over, stop stirring .O 4 -PBO-ABPBI ternary liquid crystal copolymer (O 4 PBO-co-PBO-co-ABPBI, modified chain link n / (n+m+k)=20%, k / (n...

Embodiment 2

[0088] Example 2 O 4 -HPBO-ABPBI (poly-2,5-benzoxazole-hydroxyp-phenylenebenzobisoxazole-benzimidazole) and its monofilament fibers

[0089]

[0090] A) 10% monooxazole-26% HPBO modified ABPBI

[0091] Sequentially add P into the glass polymerization reaction column 2 o 5 Mass concentration is 88.43% polyphosphoric acid (PPA) 23.5g (18.5g85.3%PPA, 5.0gP 2 o 5 ), turn on the spiral stirring, and raise the temperature to 120°C to control the stirring at a speed of 350r / min, pass N 2 Slowly add 5.615g of a mixture of a compound salt and two AB-type monomers (AHBA 0.459g, HD2.417g, DABA 2.739g, mol ratio 0.5:1.25:3, mass ratio 0.08:0.43:0.49) under protection, and add Stir for 30 minutes and heat up to 150°C to appear yellow-green fluorescence (liquid crystal state after 20 minutes). Finally, control the temperature between 150-180°C and polymerize for another 30 minutes to form a filament until the speed drops significantly to 200r / min or below. When finished, stop stirr...

Embodiment 3

[0094] Example 3 O 4 -PBI-ABPBI (poly-2,5-benzoxazole-p-phenylenebenzodiimidazole-benzimidazole) and its monofilament fibers

[0095]

[0096] Sequentially add P into the glass polymerization reaction column 2 o 5 Mass concentration is 85.3% polyphosphoric acid (PPA) 18.0g, P 2 o 5 3.4g, turn on the spiral stirring, and raise the temperature to 120°C and control the stirring speed of 350r / min, pass N 2 Slowly add 4.866g of a mixture of two AB-type monomers and a compound salt monomer (AHBA 1.633g, TATAB 1.613g, DABA1.62g, mol ratio 1:0.5:1, mass ratio 0.336:0.331:0.333) under protection for 3 minutes After adding, stir for 1 hour and heat up to 164°C to appear gray brown fluorescence (liquid crystal state after 15 minutes), and finally control the temperature between 165-170°C and polymerize for another 20 minutes until the speed drops significantly to 200r / min or below. For the end of the polymerization reaction, stop stirring. Get O 4 -PBI-ABPBI ternary liquid crys...

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Abstract

The invention discloses a ternary light-resistant liquid crystal copolymer containing an imidoxazole structure and its preparation and application. The structure of the ternary liquid crystal copolymer containing the imidoxazole structure is as shown in formula I, and the intrinsic viscosity is 4-16dL / g; in formula I: n, m, and k are the numbers of three kinds of molecular chains respectively, wherein n, m, and k are all natural numbers, the range of k / (n+m+k) is 10-40%, and the range of n / (n+m+k) is 10-30%; X represents O atom or functional group NH; Y and Y 1 each independently selected from H or OH; Ar 0 Indicates one of the following 4-valent organic skeleton structures: the ternary liquid crystal copolymer containing an imidoxazole structure has the characteristics of high heat resistance, high light resistance, good spinnability, low density and low cost. The present invention discloses Its application in the preparation of fibers, the prepared multifilament fibers have the characteristics of high heat resistance temperature, excellent light resistance and high tensile strength.

Description

technical field [0001] The invention relates to a kind of ternary liquid crystal copolymer containing imidoxazole structure and its preparation and application. Background technique [0002] At present, the performance indicators of various high-performance fibers are listed in the following table [0003] Table 1 [0004] [0005] *China Blue morning light data [0006] Among the high-performance fibers listed in Table 1, carbon fiber has the best compressive properties, followed by M5; PBO has the best breaking strength and limiting oxygen index (LOI), but the compressive strength is the lowest; M5 has the highest tensile modulus, But the density is also high and the decomposition temperature is low; m-PBI has the lowest density, the highest elongation at break and the highest moisture regain, but low strength; the coexistence of advantages and disadvantages of these high-performance fibers promotes the research and development of modification of high-performance fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/22C09K19/38D01F6/78D01F8/16
CPCC08G73/22C09K19/3823D01F6/78D01F8/16
Inventor 金宁人陈汉庚高胜张亚川郑志国
Owner 宁夏瑞鼎科技有限公司
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