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A kind of lignin composite magnetic thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and lignin technology, which is applied in the field of preparation of functional materials, can solve the problems of poor toughness of elastomers, large intermolecular force, and difficulty in magnetic particles, and achieve improved magnetic properties, excellent mechanical properties, and weakened agglomeration Effect

Active Publication Date: 2021-11-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, its intermolecular force is large, it is easy to agglomerate into large particles, and it is difficult to disperse
[0005] In the prior art, most of the elastomer materials are prepared by a dry method, which faces many problems such as difficulty in dispersing the magnetic particles in the matrix material, poor toughness of the elastomer when the amount of magnetic particles added is high, etc.

Method used

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  • A kind of lignin composite magnetic thermoplastic elastomer and preparation method thereof
  • A kind of lignin composite magnetic thermoplastic elastomer and preparation method thereof
  • A kind of lignin composite magnetic thermoplastic elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: A lignin-composite magnetic thermoplastic elastomer and its preparation method:

[0034] (1) Dissolve 110 g of lignin in 500 mL of tetrahydrofuran solvent, ultrasonicate at 40 KHz for 10 min, and filter to remove undissolved lignin to obtain a filtrate;

[0035] (2) 260g FeCl 3 ·6H 2 O and 96g FeCl 2 4H 2 O was dissolved in 12L of water, heated to 65°C, stirred for 10 min under nitrogen protection, and 25% wt concentrated ammonia water was added dropwise at a rate of 10 mL / min until black flocs appeared, and the pH was maintained above 10, and continued to stir for 2 h; The speed is 500rpm;

[0036] (3) When the temperature of the above reaction solution drops to 50°C, add the filtrate obtained in step (1) dropwise at a rate of 10mL / min, continue to stir at 500rpm / min for 30min, cool and age at room temperature for 1h, centrifuge at 4000rpmn for 10min, separate the product, and The solid was washed with water to neutrality to obtain lignin-ferric oxide n...

Embodiment 2

[0039] Example 2: A lignin-composite magnetic thermoplastic elastomer and its preparation method:

[0040] Step (1)~step (3) is the same as embodiment 1,

[0041] (4) Pre-masticate carboxylated nitrile rubber for 5 minutes at room temperature, then weigh 30 g of carboxylated nitrile rubber and place it in 300 mL of tetrahydrofuran solvent, dissolve overnight, and add the product obtained in step (3) with a solid content of 30 g, and mechanically stir at 500 rpm for 1 h , the resulting suspension was placed in a fume hood to evaporate the tetrahydrofuran solvent, and then placed in an oven to dry completely;

[0042](5) Add the material obtained in step (4) into an internal mixer, knead at 120°C for 30 minutes, and pass through the open mixer for 20 times to remove the sheet after discharging, put it in a flat vulcanizer and heat press at 180°C 30min molding.

Embodiment 3

[0043] Example 3: A lignin-composite magnetic thermoplastic elastomer and its preparation method:

[0044] Step (1)~step (3) is the same as embodiment 1,

[0045] (4) Pre-masticate carboxylated nitrile rubber for 5 minutes at room temperature, then weigh 20 g of carboxylated nitrile rubber and place it in 200 mL of tetrahydrofuran solvent, dissolve overnight, and add the product obtained in step (3) with a solid content of 40 g, and mechanically stir at 500 rpm for 1 h , the resulting suspension was placed in a fume hood to evaporate the tetrahydrofuran solvent, and then placed in an oven to dry completely;

[0046] (5) Add the material obtained in step (4) into an internal mixer, knead at 120°C for 30 minutes, and pass through the open mixer for 20 times to remove the sheet after discharging, put it in a flat vulcanizer and heat press at 180°C 30min molding.

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Abstract

The invention discloses a lignin composite magnetic thermoplastic elastomer and a preparation method thereof. Dissolve ferric salt in water, stir, add ammonia water dropwise thereto until black flocs appear, stir to obtain a reaction solution; (3) wait for the temperature to drop, add the filtrate dropwise, stir, age, and centrifuge to obtain a solid product, which is Washing to neutrality to obtain lignin-ferric oxide nanoparticles; (4) plasticizing the rubber, dissolving it in a solvent, adding nanoparticles thereto, stirring to obtain a suspension; volatilize and dry; (5) mix and knead the material obtained in step (4), thin it out after discharging, and heat-press to form it. The invention adopts the solution method, and no vulcanizing agent is added in the process, which can effectively improve the reinforcing effect and magnetic properties of the composite material, and can be molded again.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, in particular to a preparation method of a magnetic thermoplastic elastomer, in particular to a lignin-combined magnetic thermoplastic elastomer and a preparation method thereof. Background technique [0002] Thermoplastic elastomers, also known as artificial rubber, have both physical and mechanical properties such as high elasticity of traditional vulcanized rubber and processing properties of thermoplastics. [0003] Magnetic materials are a general term for materials that can respond to magnetic fields in a certain way. According to the difficulty of magnetization, they are generally divided into soft magnetic materials and hard magnetic materials. As the most commonly used magnetic material, ferroferric oxide is widely used in in magnetic materials. The composite material prepared by magnetic powder and thermoplastic elastomer is called magnetic thermoplastic ela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L13/00C08L97/00C08L23/28C08K3/22
CPCC08K2003/2275C08K2201/01C08K2201/011C08L13/00C08L23/283C08L97/005C08L2207/04C08K3/22
Inventor 应汉杰朱时祥李明朱晨杰庄伟唐成伦沈涛谭卓涛柳东陈勇牛欢青杨朋朋吴菁岚高南欧阳平凯
Owner NANJING TECH UNIV
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