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Method for preparing aramid-pulp composite master batches

A technology of aramid pulp and masterbatch, which is applied in the field of preparation of aramid pulp composite masterbatch, which can solve the problems of microfiber entanglement and unfavorable pulp dispersion, and achieve lower specific surface energy, better mechanical properties and simplified process The effect of the process

Active Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic powder has a certain isolation effect on pulp, it is difficult to disperse the powder evenly on the pulp surface only by mechanical force, and long-term high-speed stirring can cause the entanglement of the microfibers of the pulp itself, which is not Facilitate the dispersion of pulp

Method used

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  • Method for preparing aramid-pulp composite master batches
  • Method for preparing aramid-pulp composite master batches
  • Method for preparing aramid-pulp composite master batches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 20 parts by mass of para-aramid pulp to 1000 parts by mass of the water phase, and stir fully at 2000 r / min until there is no obvious agglomeration;

[0033] (2) Weigh 20 parts by mass of tetraethoxysilane (TEOS) and dissolve it in absolute ethanol to prepare a solution with a mass fraction of 50%. Then add it to (1) and stir evenly at a speed of 2000r / min. Subsequently, an ethanol solution of n-butylammonium with a mass fraction of 25% was added dropwise to the solution, and the batch pH of the solution was maintained at 10, 30° C., stirring for 3 hours, and then standing for 15 hours.

[0034] (3) Subsequently, 2 parts by mass of 3-aminopropyltriethoxysilane coupling agent was added dropwise to the solution, and stirred at a rotation speed of 1000r / min for 5h at room temperature.

[0035] (4) After the mixture is dehydrated and vacuum-dried in a vacuum drying cabinet at 100°C, it is subjected to high-speed fluffing treatment in a high-speed blender at a speed of 300...

Embodiment 2

[0038] (1) Add 10 parts by mass of para-aramid pulp to 300 parts by mass of the water phase, and stir fully at 1000r / min until there is no obvious agglomeration;

[0039] (2) Weigh 20 parts by mass of tetraethoxysilane (TEOS), and dissolve it in absolute ethanol to prepare a solution with a mass fraction of 30%. Then add it to (1) and stir evenly at a speed of 800r / min. Then add dropwise a 10% mass fraction of n-butylammonium solution to the solution, keep the pH of the solution at 8, 500r / min at 50℃, stir for 2h, and then stand for 10h;

[0040] (3) Then add 1 part by mass of γ-methacryloxypropyltrimethoxysilane coupling agent to the solution, and stir for 3h at room temperature 800r / min;

[0041] (4) After dehydrating the mixture and vacuum drying in a vacuum drying oven at 80°C, perform high-speed fluffing treatment in a high-speed blender at a speed of 2000r / min for 4min;

[0042] (5) Mix 100 parts by mass of polypropylene particles with (4) treated pulp, 0.1 parts of antioxidant...

Embodiment 3

[0056] The aramid pulp composite precursors prepared in the above examples and comparative examples were used to reinforce the corresponding matrix materials. First, use a twin-screw extruder to directly blend different amounts of composite masterbatch with the corresponding matrix, then melt blend, extrude, pelletize, and dry, and then inject the resulting pellets into standard specimens with an injection molding machine. The performance test results are shown in Table 1 (comparison between Example 1 and Comparative Example 1, and contrast between Example 2 and Comparative Example 2):

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Abstract

The invention relates to a method for preparing aramid-pulp composite master batches. The method includes the steps that aramid pulp is fully separated through inorganic filler generated through in-situ polymerization, the aramid pulp after separation is further modified with a coupling agent, the product is dried and bulked at a high speed, then the product and thermoplasticity particles or powder are subjected to extrusion pelletizing, and the corresponding aramid-pulp composite master batches are prepared. By means of the method, microfibril of the aramid pulp can be fully extended, the in-situ-generated particles have the better separating effect on the microfibers, and after modification is carried out through the coupling agent, the combination effect of the pulp and a base body can be further improved; compared with the method that aramid pulp is directly separated with inorganic powder, the method is more obvious in separating effect, and all properties of a base body material are also improved.

Description

Technical field [0001] The invention belongs to the technical field of manufacturing high-performance polymer structural materials, and specifically relates to a preparation method of aramid pulp composite masterbatch. Background technique [0002] As a differentiated product of aramid fiber, aramid pulp has the high strength, high modulus, wear resistance and heat resistance of aramid fiber itself, and also has some special structural advantages: the main fiber Rich in microfibrils, the pulp has a large specific surface area, and the formed three-dimensional network structure has a good toothing effect with the matrix material. However, in actual use, aramid pulp has a strong polarity and high electrostatic tendency, which makes the microfibrils of the pulp more likely to be entangled and adsorbed on the backbone fibers, making it difficult to disperse in the matrix material. If it is directly melt blended with the thermoplastic matrix, it is easy to disperse unevenly, resultin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L23/12C08L77/10C08K13/06C08K9/06C08K3/36C08K5/134C08K5/526C08J3/205C08J3/22
CPCC08J3/205C08J3/226C08J2323/12C08J2377/02C08J2423/12C08J2477/02C08K2201/011C08L23/12C08L77/02C08L2205/02C08L2205/16C08L77/10C08K13/06C08K9/06C08K3/36C08K5/1345C08K5/526
Inventor 王小萍杜江华贾德民
Owner SOUTH CHINA UNIV OF TECH
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