PPTA paper using aramid nanofiber for self-reinforcement and preparation method thereof

A para-aramid paper and nanofiber technology, applied in special paper, fiber dispersant addition, paper and other directions, can solve the problem of the decline of comprehensive performance of aramid paper, and achieve strong innovation, broad application prospects, large length and diameter Effect of ratio and specific surface area

CN108265566AActive Publication Date: 2018-07-10SHAANXI UNIV OF SCI & TECH
8 Cites 33 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-07-10

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a PPTA paper using aramid nanofiber for self-reinforcement and a preparation method thereof. The preparation method includes: utilizing para-aramid paper nanofiber with the advantages of special nano-structure, small fiber diameter, large length-diameter ratio, high surface activity, excellent heat resistance and the like as the self-reinforcement material of para-aramid paper, conducting mixing, defibering and dispersion on aramid chopped fiber, pulp or fibrid and aramid nanofiber to make a uniform suspension, carrying out papermaking shaping, squeezing and drying, andfurther performing hot-pressing on a hot press to obtain aramid paper. The introduced aramid nanofiber enables nanoscale aramid fiber and an aramid nanofilm formed thereby to reach the good interfacefilling, coating and enhancement effects, provides more binding sites for the combination of components, at the same time reduces the pores and holes between components, significantly improves the bonding strength between the aramid paper components, and greatly enhances the mechanical and insulation properties.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of polymer nanomaterials and papermaking, and in particular relates to para-aramid paper self-reinforced by aramid nanofibers and a preparation method thereof. Background technique

[0002] Para-aramid fiber (PPTA) is a high-performance synthetic fiber with high strength, high modulus, excellent insulation and high temperature resistance, and is an ideal raw material for protective and reinforcing materials. Para-aramid paper is made of para-aramid chopped fibers and para-aramid pulp fibers or para-aramid fibrids as raw materials through wet papermaking and hot-pressing process. Due to the rigid chain structure formed by the π-π conjugation inside the para-aramid fiber molecular chain, the hydrogen bond between the molecular chains and the van der Waals force, it forms a dense and orderly two-dimensional network structure, although the fiber itself is guaranteed High strength, high modulus, high temperature resistanc...

Examples

preparation example Construction

[0041] A method for preparing a self-reinforced para-aramid paper utilizing aramid nanofibers, comprising the following steps:

[0042] Step 1: Disperse the aramid fiber X, that is, the para-aramid chopped fiber, through a standard fiber deflagging machine for 10,000-30,000 r to obtain a slurry suspension A. During the de-flaking, it is necessary to add a fiber with a molecular weight of 3 to 5 million Polyethylene oxide is used as a dispersant, and the dosage is 0.1-0.5% of the absolute dry mass of the aramid fiber X;

[0043] Step 2: Fibrillating one or both of the aramid fiber Y, that is, the para-aramid fibrid fiber and the para-aramid pulp fiber, and adding it to the slurry suspension obtained in step 1 A, using a standard fiber deflagging machine to decompose and disperse for 10000-20000r to prepare a slurry suspension B. The degree of fibrillation treatment is to detect a beating degree of 45-60°SR, and the aramid fiber in the slurry suspension B is X The mass ratio to...

Embodiment 1

[0048] A self-reinforced para-aramid paper using aramid nanofibers, in parts by weight, the components of the aramid paper include: para-aramid fibers: 99 parts, aramid nanofibers: 1 part, The aramid fiber is a mixed system of aramid fiber X and aramid fiber Y, wherein the weight ratio of aramid fiber X and aramid fiber Y is 3:7, and the aramid fiber X is para-aramid Aramid chopped fiber; the aramid fiber Y is a para-aramid fibril;

[0049] Wherein, the aramid fiber nanofiber is made by the following preparation steps:

[0050] Step (1): 1.0g para-aramid yarn fiber, 1.5g potassium hydroxide (KOH) and 500ml dimethyl sulfoxide (DMSO) are placed in a container, and stirred at a temperature of 30°C under sealed conditions After 8 days, the aramid nanofiber dispersion liquid dispersed in the KOH / DMSO system was obtained;

[0051] Step (2): The aramid nanofiber dispersion liquid dispersed in the KOH / DMSO system obtained in step (1), under the action of stirring at 600rpm, inject d...

Embodiment 2

[0061] A self-reinforced para-aramid paper using aramid nanofibers, in parts by weight, the components of the aramid paper include: para-aramid fibers: 97 parts, aramid nanofibers: 3 parts, The aramid fiber is a mixed system of aramid fiber X and aramid fiber Y, wherein the weight ratio of aramid fiber X and aramid fiber Y is 3.5:6.5, and the aramid fiber X is para-aramid Aramid chopped fiber; the aramid fiber Y is para-aramid pulp fiber;

[0062] Wherein, the aramid fiber nanofiber is made by the following preparation steps:

[0063] Step (1): 1.0g of para-aramid chopped fiber, 1.5g of potassium hydroxide (KOH) and 500ml of dimethyl sulfoxide (DMSO) are placed in a container, and stirred at a temperature of 40°C under sealed conditions After 7 days, the aramid nanofiber dispersion liquid dispersed in the KOH / DMSO system was obtained;

[0064] Step (2): The aramid nanofiber dispersion obtained in step (1) dispersed in the KOH / DMSO system is injected with deionized water at a...