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Preparation method of PPTA-MPIA in-situ composite fibrid

A technology of precipitating fibers and in-situ compounding, which is applied in the field of synthetic fibers and can solve problems such as inability to compound

Active Publication Date: 2019-08-30
JIANGSU RUISHENG ADVANCED MATERIAL TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can improve the strength, it cannot fundamentally combine the two materials

Method used

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  • Preparation method of PPTA-MPIA in-situ composite fibrid
  • Preparation method of PPTA-MPIA in-situ composite fibrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, weigh 50.0 g of the raw materials PPTA (intrinsic viscosity: 3.0 dL / g) and MPIA (intrinsic viscosity: 1.0 dL / g) according to the mass ratio of 1:1, and add them to the dissolution tank. Then a co-solvent (concentrated sulfuric acid, 900.0 g) was added to the dissolution kettle, the temperature was raised to 90° C., and stirred for 30 minutes to dissolve.

[0022] Use a small metering pump to drain the mixed solution in the kettle to the sedimentation machine with a flow rate of 30.0g / min. The coagulation bath in the settling machine is 10% dilute sulfuric acid, the rotating speed of the turntable is 1000r / min, and the settling residence time is 1min. Finally, the obtained composite fibrids are washed with distilled water several times and dried.

[0023] The PPTA-MPIA composite precipitated fiber obtained by this method has good dispersion in water, the beating degree is 30°SR, and the specific surface area is 7.0m 2 / g, the average fiber length is 0.8mm.

Embodiment 2

[0025] First, weigh 40.0g and 20.0g of the raw materials PPTA (intrinsic viscosity: 2.3dL / g) and MPIA (intrinsic viscosity: 0.8dL / g) according to the mass ratio of 2:1, respectively, and add them to the dissolution tank. Any one or more of the co-solvents are subsequently added.

[0026] In a preferred embodiment of the present invention, the capping agent is preferably any one or more of methanol and ethanol.

[0027] In a preferred embodiment of the present invention, the intrinsic viscosity of the raw material or puree of PPTA and MPIA is 0.5-8.0 dL / g. Preferably 0.5-3.0 dL / g.

[0028] In a preferred embodiment of the present invention, it is characterized in that, in the mixed solution prepared in step 1, the total solid content of PPTA and MPIA accounts for 0.5-20%. Preferably it is 0.5 to 10%.

[0029] In a preferred embodiment of the present invention, the dissolution temperature in the first step is 40-90° C., and the dissolution time is 0.5-10 hr.

[0030] In a pr...

Embodiment 3

[0038] First, weigh 20.0 g and 40.0 g of the raw materials PPTA (intrinsic viscosity: 3.0 dL / g) and MPIA (intrinsic viscosity: 1.0 dL / g) according to the mass ratio of 1:2, respectively, and add them into the dissolution tank. Then the co-solvent (concentrated sulfuric acid, 1140.0 g) was added to the dissolution tank, the temperature was raised to 90° C., and stirred for 30 minutes to dissolve. Use a small metering pump to drain the mixed liquid crystal solution in the kettle to the sedimentation machine with a flow rate of 40.0g / min. The coagulation bath in the settling machine is 5% dilute sulfuric acid, the rotating speed of the turntable is 2000r / min, and the settling residence time is 1min. Finally, the obtained composite fibrids are washed with distilled water several times and dried.

[0039] The PPTA-MPIA composite precipitated fiber obtained by this method has good dispersion in water, the beating degree is 35°SR, and the specific surface area is 6.3m 2 / g, the ave...

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Abstract

The invention discloses a preparation method of a PPTA-MPIA in-situ composite fibrid. The preparation method comprises the following steps: 1, dissolving PPTA and MPIA raw materials or raw stock in aco-solvent to obtain a PPTA-MPIA mixed solution; 2, feeding the PPTA-MPIA mixed solution into a precipitation machine containing a circulating coagulation bath for shearing, and executing washing withdistilled water for several times after shearing is finished to obtain the PPTA-MPIA in-situ composite fibrid; the cosolvent in the step 1 contains a solvent, a cosolvent and an end-capping reagent;the solvent is prepared from one or more of N-methyl pyrrolidone, concentrated sulfuric acid, N,N-dimethylacetamide; the cosolvent is an alkali metal chloride; the end-capping reagent is an alcohol end-capping reagent. The composite fibrid prepared by the preparation method not only can retain the excellent performances of high temperature resistance and weak moisture absorption of a para-aramid precipitation fiber, but also has the liquid phase dispersion performance and the composite reinforcing effect of a meta-aramid precipitation fiber, and has good mechanical performance and thermal stability.

Description

technical field [0001] The invention belongs to the technical field of synthetic fibers, and in particular relates to a preparation method of PPTA-MPIA in-situ composite precipitated fibers. Background technique [0002] Both aramid 1313 and aramid 1414 are new high-tech synthetic fibers with high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight, insulation and other excellent properties. Synthetic paper and electrical insulation paper are widely used. [0003] At present, the domestically reported aramid fibrids are mainly a single product, while the meta- and para-aramid fibrids have certain defects in their performance, which still need to be improved. For example, the heat-resistant temperature and strength of meta-aramid fibrids are relatively low, and they are easy to absorb moisture, which cannot meet the technical requirements of some high-grade products; while para-aramid fibrids are poor in dyeability, dispersibility an...

Claims

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Application Information

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IPC IPC(8): D01F8/12D01F1/10
CPCD01F1/10D01F8/12
Inventor 曹煜彤赵开荣顾克军陈超曹美荣卢铖朱俊强
Owner JIANGSU RUISHENG ADVANCED MATERIAL TECH CO LTD
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