Fiber paper and preparation method therefor

Abstract

Disclosed are a fiber paper and a preparation method thereof. The fiber paper includes a first fiber which includes a polyarylester fiber having a diameter of 0.1-3 μm, a length of 0.2-5 mm, and an aspect ratio of 800-1200. The polyarylester fiber is used as a raw material and a property of low water absorption rate of which is utilized to improve problems caused by the polyarylester fiber in a high humidity environment. At the same time, the diameter and length of the polyarylester fiber are controlled to meet a specific range, to enable the fiber paper to have better uniformity, density, strength and insulation performance.

What is claimed is: 
     
         1 . A fiber paper, comprising a first fiber which comprises a polyarylester fiber, the polyarylester fiber having a diameter of 0.1 μm-3 μm, a length of 0.2 mm-5 mm, and an aspect ratio of 800-1200. 
     
     
         2 . The fiber paper according to  claim 1 , wherein compositions of the polyarylester fiber comprise a polymer of an aromatic hydroxy carboxylic acid; and/or
 compositions of the polyarylester fiber comprise a copolymer of an aromatic hydroxy carboxylic acid, an aromatic dicarboxylic acid, an aromatic diol, and an aliphatic diol; and/or   a mass proportion of the polyarylester fiber is 5% to 100%.   
     
     
         3 . The fiber paper according to  claim 1 , further comprising a second fiber which has a diameter of 8 μm-30 μm, a length of pulps of 2 mm-30 mm, and an aspect ratio of 130-500. 
     
     
         4 . The fiber paper according to  claim 3 , wherein compositions of the second fiber comprise a polyarylester; and/or
 a mass proportion of the second fiber is 25% to 75%.   
     
     
         5 . A method for preparing a fiber paper which is the fiber paper according to  claim 1 , comprising:
 mixing and spinning an island component and a sea component to obtain a sea-island fiber, the island component comprising a polyarylester;   removing the sea component in the sea-island fiber to obtain pulps of polyarylester fiber; and   papermaking the pulps of the polyarylester fiber to obtain a fiber paper.   
     
     
         6 . The method for preparing the fiber paper according to  claim 5 , wherein a mass ratio of the sea component to the island component ranges from 35:65 to 80:20. 
     
     
         7 . The method for preparing the fiber paper according to  claim 5 , wherein the sea component comprises at least one of a polyethylene, a polystyrene, a nylon 66, a modified polyester. 
     
     
         8 . The method for preparing the fiber paper according to  claim 7 , wherein the sea component in the sea-island fiber is removed by an impregnation method; and/or
 the sea component is the polystyrene, a solvent for the impregnation method comprising at least one of a toluene and a xylene; and/or   the sea component is the modified polyester which is an alkali-decreased polyester, a ratio of an alkali decomposition rate of the alkali-decreased polyester to that of the polyester being more than 1000, and the solvent for the impregnation method comprising an alkali solution.   
     
     
         9 . The method for preparing the fiber paper according to  claim 8 , wherein a raw material for the modified polyester comprises a dimethyl isophthalate-5-sodium sulfonate and a polyethylene glycol; and/or
 a molar ratio of the dimethyl isophthalate-5-sodium sulfonate to the polyethylene glycol is (2-4):(6-8); and/or   a sum of masses of the dimethyl isophthalate-5-sodium sulfonate and the polyethylene glycol is 10% to 20% of a sum of masses of all raw materials of the modified polyester.   
     
     
         10 . The method for preparing the fiber paper according to  claim 8 , wherein a concentration of the alkali solution ranges from 2 g/L to 400 g/L; and/or
 an impregnation temperature of the alkali solution ranges from 70° C. to 100° C.