Durable cellulose fiber and application thereof

A cellulose fiber and durability technology, applied in the field of polymer composite materials, can solve problems such as low density, fading and aging, and large aspect ratio

Inactive Publication Date: 2010-09-15
HUANGSHAN HUASU NEW MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Natural plant fiber has a large aspect ratio, high specific strength, large specific surface area, low density, excellent mechanical properties, low cost, renewable and in a specific process Due to the unique advantages such as biodegradability under certain conditions, the potential advantages of natural plant fibers as reinforcing materials have attracted more and more attention. However, due to the high hydrophilicity and polarity of natural plant fibers, natural plant fibers cannot Compatibility and interfacial adhesion with non-polar plastic base materials are poor, and natural plant fibers contain lignin, hemicellulose and other components that are easily photodegradable and hydrolyzed, and are prone to fading when exposed to sunlight Problems such as aging, water absorption and fungus growth make the durability of natural plant fibers poor in actual use, and it is difficult to meet the actual needs of high-strength, high-modulus, and weather-resistant structural composite materials for outdoor applications

Method used

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  • Durable cellulose fiber and application thereof
  • Durable cellulose fiber and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 40g of microcrystalline cellulose, add 40g of tetrahydrofuran, first disperse at 40°C at high speed for 60min, add 16g of toluene diisocyanate under stirring condition, add 0.10g of catalyst dimethylethanolamine, heat up to 40°C and keep the temperature for 1.5h, Add 8 g of aminopropyltriethoxysilane dropwise, keep warm at 30°C for 1 hour and filter with suction, recycle the filtrate, wash the filtrate twice with acetone, and dry it in vacuum at 30°C for 4 hours to obtain modified cellulose fibers.

[0037] Weigh 10g of the above-mentioned modified cellulose fibers and crush them through a 20-mesh sieve, add 70g of polyethylene, 0.5g of maleic anhydride grafted polyethylene, and 0.5g of titanate coupling agent. After mixing evenly, use a twin-screw extruder to It is extruded and granulated at 140°C, and molded at a pressure of 5 MPa and a temperature of 150°C.

Embodiment 2

[0039] Weigh 40.0g of hemp cellulose fiber, add 360g of N,N dimethylformamide, stir at high speed for 10min, then add 4g of toluene diisocyanate, raise the temperature to 50°C and keep it warm for 0.5h, then add dropwise N-aminoethyl-3- 10.0 g of aminopropylmethyldimethoxysilane was incubated at 40°C for 2 hours and suction filtered, the filtrate was recycled, the filtrate was washed twice with tetrahydrofuran, and vacuum dried at 60°C for 4 hours to obtain modified cellulose fibers.

[0040] Weigh 70g of the above-mentioned modified cellulose fiber and crush it through a 100-mesh sieve, add 20g of polypropylene, 5.0g of polyethylene wax, 3.0g of maleic anhydride grafted polypropylene, and 1.0g of zinc stearate. The screw extruder extruded and pelletized at 210°C, and molded at a pressure of 5 MPa and a temperature of 190°C.

Embodiment 3

[0042]Weigh 40.0g of bamboo cellulose fiber, add 300g of tetrahydrofuran, first disperse at 40°C for 30min, then add 10.0g of isophorone diisocyanate, add 0.07g of catalyst tetramethylpropylenediamine, heat up to 60°C and keep warm for reaction After 2 hours, 12.0 g of amino-terminated polydimethyloxysiloxane with a molecular weight of 600 was added dropwise, and the reaction was carried out at 50°C for 0.5 hours. Next, vacuum-dry at 50°C for 4 hours to obtain modified cellulose fibers.

[0043] Weigh 65.0g of the above-mentioned modified cellulose fibers and crush them through a 40-mesh sieve, add 35.0g of waste plastic particles, 2.0g of maleic anhydride grafted polypropylene, 2.0g of polyethylene wax, and 1.0g of silane coupling agent K560, mix well Finally, use a twin-screw extruder to extrude and pelletize at 190°C, and extrude at a temperature of 170°C.

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Abstract

The invention relates to the technical field of macromolecular composite materials, in particular to durable cellulose fiber and application thereof. A preparation method for the durable cellulose fiber comprises the following steps of: dispersing cellulose fiber in solvent in an amount which is 1 to 10 times the total amount of the cellulose fiber; adding diisocyanate monomer which accounts for 10 to 60 percent of the total weight of the cellulose fiber, and metal catalyst or amine catalyst, which accounts for 0 to 5 percent of the total weight of the cellulose fiber, for polyurethane synthesis into the dispersed solution to perform reaction, and then adding siloxane monomer or siloxane polymer which accounts for 5 to 50 percent of total weight of the cellulose fiber into the reaction solution to perform reaction; and finally, cooling the obtained reaction product to room temperature, washing and separating filtrate, and drying the filtrate to obtain the durable cellulose fiber of the invention. The obtained durable cellulose fiber has the advantages of obviously improved hydrophobic property, good thermal stability, ultraviolet ageing resistance and antibacterial performance, and meanwhile has good durability when the durable cellulose fiber is applied in a wood-plastic composite material.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a durable cellulose fiber and its application. Background technique [0002] Natural plant fibers have unique advantages such as large aspect ratio, high specific strength, large specific surface area, low density, excellent mechanical properties, low cost, renewable and biodegradable under specific process conditions. The potential advantages of materials are attracting more and more attention, but due to the high hydrophilicity and polarity of natural plant fibers, the compatibility and interface between natural plant fibers and non-polar plastic base materials in application Adhesion is poor, and natural plant fibers contain lignin, hemicellulose and other components that are easily photodegradable and hydrolyzed. When exposed to sunlight, they are prone to fading, aging, water absorption and breeding of fungi, which makes natural plants The durability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/395D06M13/513D06M15/643C08L23/06C08L23/12C08L25/06C08L27/06C08L67/02C08L1/08D06M101/06
Inventor 方红霞吴强林任兵杰李长江史建俊许修强
Owner HUANGSHAN HUASU NEW MATERIAL SCI & TECH CO LTD
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