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A kind of flame-retardant hemp fiber/thermoplastic polymer composite board and preparation method thereof

A thermoplastic polymer and hemp fiber technology, which is applied in the field of flame retardant hemp fiber/thermoplastic polymer composite board and flame retardant sheet, can solve the problems of environmental protection requirements and poor mechanical properties of flame retardant sheets, and achieve both flame retardant performance and mechanical properties. performance, widening application range, remarkable effect

Active Publication Date: 2019-08-16
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a flame-retardant hemp fiber / thermoplastic polymer composite board to solve the current environmental protection requirements and poor mechanical properties of flame-retardant boards.

Method used

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  • A kind of flame-retardant hemp fiber/thermoplastic polymer composite board and preparation method thereof
  • A kind of flame-retardant hemp fiber/thermoplastic polymer composite board and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Soak the ramie fiber with 2% sodium hydroxide aqueous solution for 24 hours, then wash it with deionized water and dry it. Take by weighing the above-mentioned ramie fiber of 10g and 50g low-density polyethylene, put into the two-roll mill again and be mixed into composite sheet material and be sheet material I, wherein the front roller of the two-roll mill is 115 ℃, and the temperature of the back roller is 115°C. 110°C; 5g of recycled carbon fiber and 50g of low-density polyethylene were weighed, and then put into a two-roll mill to knead to form a composite material sheet, ie, sheet II. Among them, the temperature of the front roll of the double-roller mill is 115°C, and the temperature of the rear roll is 110°C; after cutting the sheet material I and sheet II according to the size of the mold, put the sheet material I between the two sheet materials II, Make it stacked into a composite structure of "sheet II-sheet I-sheet II", put it in a flat vulcanizer and heat-pr...

Embodiment 2

[0028] Soak the ramie fiber with 2% sodium hydroxide aqueous solution for 24 hours, then wash it with deionized water and dry it. Take by weighing the above-mentioned ramie fiber of 10g and 50g low-density polyethylene, put into the two-roll mill again and be mixed into composite sheet material and be sheet material I, wherein the front roller of the two-roll mill is 115 ℃, and the temperature of the back roller is 115°C. 110°C; 5g of recycled carbon fiber and 50g of low-density polyethylene were weighed, and then put into a two-roll mill to knead to form a composite material sheet, ie, sheet II. Among them, the temperature of the front roll of the double-roll mill is 115°C, and the temperature of the rear roll is 110°C; after the sheet I and sheet II are cut according to the size of the mold, the sheet II is placed between the two sheets I, Make it stacked into a composite structure of "sheet I-sheet II-sheet I", put it in a flat vulcanizer and heat-press it into a plate (hot...

Embodiment 3

[0030] Soak the ramie fiber with 2% sodium hydroxide aqueous solution for 24 hours, then wash it with deionized water and dry it. Take by weighing 10g of the above-mentioned ramie fiber, 5g of recycled carbon fiber, and 100g of low-density polyethylene and mix them into composite material flakes in a two-roll mill, wherein the temperature of the front roll of the two-roll mill is 115°C, and the temperature of the rear roll is 110°C . After the composite material sheet is cut according to the size of the mold, it is placed in a flat vulcanizer and hot-pressed into a plate (hot-pressing temperature is 140°C, hot-pressing time is 10min) and made into a sample, and its mechanical properties are tested and the ignition of the sample is recorded. The distance the flame spreads within 1 minute from the fire.

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Abstract

The invention discloses a flame-retardant hemp fiber / thermoplastic polymer composite plate. The plate is of a sandwich structure and composed of an upper surface layer, a lower surface layer and a middle core layer through hot pressing; the upper surface layer and the lower surface layer are made of sheet materials of recycled carbon fiber / thermoplastic polymer composites, and the middle core layer is made of sheet materials of hemp fiber / thermoplastic polymer composites. Through the adoption of the flame-retardant hemp fiber / thermoplastic polymer composite plate, the spread distance of flames when the composites are burnt is obviously reduced, and compared with composites without carbon fibers, the flame retardancy of the composites is increased by 34.6%. The impact strength and tensile strength of the plate are higher than those of composite plates with composites without the carbon fibers. By adding aluminum hydroxide to the surface layers, the flame retardancy is further improved. The composites have good flame retardancy and mechanical properties and are environmentally friendly and repairable, the cost is reduced, and the economic benefits are increased. The composite plate has broad application prospects in automotive industry.

Description

technical field [0001] The invention relates to a flame-retardant board, in particular to a flame-retardant hemp fiber / thermoplastic polymer composite board, which belongs to the technical field of composite materials. Background technique [0002] In order to meet the needs of lightweight and environmentally friendly auto parts, the application proportion of plant fiber / thermoplastic polymer composite materials in the automotive field is increasing year by year. Plant fibers represented by hemp fiber and wood fiber have the advantages of low density and biodegradability, which can accelerate the degradation of composite waste; the recyclability of thermoplastic polymers is also significantly better than that of thermosetting polymer-based composites, so plants Fiber / thermoplastic polymer composites are lightweight and environmentally friendly. Polymer-based composite materials for vehicles often need to have certain flame retardancy, while plant fibers and thermoplastic po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/02B32B9/04B32B27/02B32B27/12B32B33/00B32B37/06B32B37/12C08L23/06C08L97/02C08K3/22C08K7/06
CPCB32B5/02B32B5/08B32B5/26B32B9/007B32B9/02B32B9/047B32B27/12B32B33/00B32B37/06B32B37/12B32B2262/02B32B2262/065B32B2262/106B32B2307/3065B32B2307/54B32B2307/558C08K3/22C08K7/06C08K2003/2227C08L23/06C08L2201/02C08L2201/22C08L2205/16C08L2207/066C08L97/02
Inventor 盛旭敏吴承操谭伟文
Owner CHONGQING UNIV OF TECH
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