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Cationic grafting modified thermoplastic plant fiber material and preparation method thereof

A plant fiber material and plant fiber technology, applied in cationic graft modified thermoplastic plant fiber material and its preparation field, can solve the problems of difficult industrial production and application, material performance degradation, high cost, etc., and achieve easy industrial production and application, The effect of mild reaction conditions and excellent material properties

Active Publication Date: 2021-09-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the esterification and etherification methods are often only aimed at the modification of cellulose in plant fibers, which involve complicated separation of plant fiber components, fail to efficiently utilize components such as hemicellulose and lignin, and have a negative effect on cellulose The crystal structure of the material is severely damaged, which leads to a decrease in the performance of the material and a low yield; in addition, a large amount of additives such as organic solvents, swelling agents, and catalysts are consumed during the modification process, and the post-treatment process is complicated, high in cost, and has a certain impact on the environment. Pollution, poor economy and practicability, difficult to carry out industrial production and application

Method used

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  • Cationic grafting modified thermoplastic plant fiber material and preparation method thereof
  • Cationic grafting modified thermoplastic plant fiber material and preparation method thereof
  • Cationic grafting modified thermoplastic plant fiber material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a heat-plasticized full-component plant fiber material, comprising the following steps:

[0043] (1) Pretreat sisal fibers about 1-2cm long with steam explosion (continuous screw extrusion flash explosion equipment) to destroy their bundle structure and obtain steam explosion with large aspect ratio (300-1200) Sisal fiber (Steam explosionsisal fiber, SESF);

[0044] (2) SESF is dispersed in water, and the mass ratio of dry SESF and water is 1: 28, obtains dispersion liquid-1, then sodium periodate is added in the dispersion liquid-1, the absolute dry SESF and sodium periodate The mass ratio was 1:0.2, reacted at 55°C for 5 hours, washed and filtered to obtain Aldehyde sisal fiber (ASF), wherein the aldehyde group content was 0.93mmol / g;

[0045] (3) Disperse ASF in water, the mass ratio of dry ASF to water is 1:40, obtain dispersion-2, add acetic acid dropwise, adjust the suspension-2 to pH=5, then add sodium chlorite, The mol ratio of sodium c...

Embodiment 2

[0049]The difference between this example and Example 1: the mass ratio of dry SESF and sodium periodate is controlled to be 1:0.4, other steps and parameters are consistent with Example 1, and the obtained thermoplastic all-component Sisal fiber material, recorded as CCSF-0.4-3.0.

[0050] The hot-pressing temperature of CCSF-0.4-3.0 was adjusted to 120°C, and other conditions remained unchanged.

Embodiment 3

[0052] The difference between this embodiment and embodiment 1: the mass ratio of controlling absolute dry SESF and sodium periodate is 1: 0.6, the mol ratio of CTAB and carboxyl is 1.8: 1, other steps and parameters are consistent with embodiment 1, The obtained thermoplastic all-component sisal fiber material is recorded as CCSF-0.6-1.8.

[0053] The hot-pressing temperature of CCSF-0.6-1.8 was adjusted to 115°C, and other conditions remained unchanged.

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Abstract

The invention belongs to the technical field of thermoplastic plant fibers, and discloses a cationic grafting modified thermoplastic plant fiber material and a preparation method thereof. The method comprises the following steps of 1) pretreating plant fiber raw materials to obtain pretreated plant fibers; 2) in water, under the action of periodate, carrying out oxidation ring-opening reaction on the pretreated plant fibers to obtain aldehyde plant fibers; 3) oxidizing aldehyde groups in the aldehyde plant fibers into carboxyl groups to obtain carboxylated plant fibers; and 4) reacting the carboxylated plant fibers with quaternary ammonium salt in water to obtain the cationic grafting modified thermoplastic plant fiber material. The thermoplastic plant fiber material disclosed by the invention is a full-component plant fiber, has good fluidity and deformability, is good in thermoplasticity, is easy to process and form, can be repeatedly hot-pressed and formed, and is good in material performance. The method is simple, high in yield and low in cost.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic plant fiber materials, and in particular relates to a thermoplastic plant fiber material modified by cation grafting and a preparation method thereof. Background technique [0002] The continuous consumption of non-renewable resources (petroleum, coal, and natural gas) and the environmental pollution caused by petroleum polymers have prompted an increasing demand for renewable resources that are biodegradable, non-petroleum-based, and low-risk to the environment. Natural plant fiber is the most abundant renewable resource in nature and has excellent mechanical properties. Using it as a raw material to prepare environmentally friendly new materials can not only reduce the dependence on fossil resources, but also efficiently utilize natural plant fiber. [0003] If plant fibers can be processed by heating and melting like plastics, they will partially replace petroleum-based polymers and effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/30D06M11/50D06M13/463D06M101/04
CPCD06M11/30D06M11/50D06M13/463D06M2101/04Y02W30/62
Inventor 冯彦洪张丁山雷波
Owner SOUTH CHINA UNIV OF TECH
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