CN104774368A - Method for preparing polyethylene-based wood-plastic composite material by using bagasse - Google Patents

Abstract

The invention discloses a method for preparing a polyethylene-based wood-plastic composite material by using bagasse. The method comprises the steps: soaking the bagasse into a sodium hydroxide aqueous solution for alkalization treatment, then, washing with distilled water, then, drying, and carrying out mechanical crushing, so as to prepare bagasse powder with the particle diameter of 100-200 meshes; weighing raw materials, namely the bagasse powder, medium-density polyethylene, benzoyl peroxide, maleic anhydride, silicone oil, chlorinated paraffin and dibasic lead phthalate, according to the following mass ratio of (20-60): (10-50): (0.5-2): (1-4): (15-20): (1-7): (0.5-4.0), uniformly mixing the raw materials in a high-speed stirrer so as to prepare a mixed material, and then, reacting and extruding in a twin-screw extruder, thereby preparing an extruded-molded sheet material, namely the polyethylene-based wood-plastic composite material. According to the method disclosed by the invention, the operation is simple, the waste is utilized, and large-scale popularization and application are facilitated; the prepared polyethylene-based wood-plastic composite material is non-toxic and environment-friendly, is excellent in comprehensive performance and easy in processing and can replace the traditional timber, thereby having a broad application prospect.

Description

A kind of method utilizing bagasse to prepare polyethylene based wood-plastic composite material

Technical field

The invention belongs to wood plastic composite preparing technical field, particularly a kind of method utilizing bagasse to prepare polyethylene based wood-plastic composite material.

Background technology

Containing wood powder and thermoplastic cement raw material in wood plastic composite, thermoplastic cement raw material wherein can adopt the dead meal of industry or life.From the angle of raw materials for production, wood plastic composite slows down and eliminates the public hazards pollution of plastic refuse, also eliminates bagasse and piles up and burn the pollution brought to environment.Matrix material has had the advantage of timber and plastics concurrently simultaneously: 1. good processing characteristics.Wood plastic composite includes plastics and fiber, therefore, has the processing characteristics that same timber is similar, can saw, can follow closely, can dig, and use carpenter's utensil to complete, and nail-holding ability is obviously better than other synthetic materialss.Mechanical property is better than wood materials.Nail-holding ability is generally 3 times of timber, is 5 times of shaving board.2. good strength property.Wood plastic composite includes plastics, thus has good Young's modulus.In addition, due to including fiber and through fully mixing with plastics, thus there is the resistance to compression suitable with hardwood, the physical and mechanical properties such as counter-bending, and its wearing quality is obviously better than normal wood material.Surface hardness is high, is generally 2 ~ 5 times of timber.3. there is water-fast, corrosion resistant performance, long service life.Wood-plastic material and products thereof, can anti-strong acid-base, water-fast, corrosion-resistant compared with timber, and not bacterial growth, is not easily damaged by worms, not long fungi.Long service life, can reach more than 50 years.4. excellent adjustable performance.By auxiliary agent, the changes such as plastics can be polymerized, foam, solidify, modification, thus the characteristic such as density, intensity changing Wood-plastic material, can also reach anti-aging, anti-electrostatic, the particular requirement such as fire-retardant.Because wood plastic composite has so many performance, just decide it will be widely used.1. construction industry.The floor of making by Wood Fiber Composites than superior many in low wood fibre board performance at present, not breathing, waterproof, surface aesthetic.If meet material for multilayer coextrusion section bar, internal layer adopts reclaimed materials, and outer employing virgin material, the every mechanical property of the goods made can compare favourably with hardwood products.2. the application of automobile industry.In recent years, Wood plastic boards, with its rational price, superior performance, is applied and is increased in automobile decoration material, as automobile door-plate, after put thing case, luggage case sidewall, seat plate etc.3. other industry.Except traditional industry, the Application Areas of matrix material constantly expands, started at present apply as pallet, flowerpot, handle for tool, office appliance, attack the engine components such as fast highway route marker, acoustic board and audio amplifier.

Sugarcane is one of main raw material of sugaring, bagasse remaining after squeezing sugar, a kind of important agricultural wastes, along with the development of modern industry, bagasse has become a kind of very important biomass resource, it about has the fiber of 50% can be used for papermaking, and in addition, bagasse can be cooked the wood powder of wood plastic composite after pulverizing.

As everyone knows, polyethylene is one of four large general-purpose plastics in macromolecular material, and its consumption accounts for 60%.Along with the continuous expansion of polyethylene consumption market, the continuous variation of consumption kind, its poly waste amount is also in continuous increase.At present, the waste of the upper recoverable of annual society of China about has 1Mt, and what reality utilized about has 0.2Mt, 0.8Mt is also had to fail to be recycled, major part waste is disposed with land-fill method, so not only causes secondary pollution, also result in the profligacy of material.Along with science and technology, constantly progress and demand for energy constantly increase, how sooner, the recycling work relationship of carrying out waste better the rich and powerful of country and progress, and one of the recycling solving polyethylene waste important content during to be all waste thing recycle.

Summary of the invention

The object of this invention is to provide a kind of method utilizing bagasse to prepare polyethylene based wood-plastic composite material.

Concrete steps are:

(1) bagasse being immersed in mass percent concentration is alkalinisation treatment 3 ~ 4 hours in the aqueous sodium hydroxide solution of 10 ~ 20%, and alkalization temperature is 30 ~ 40 DEG C, obtained alkalinisation treatment bagasse.

(2) alkalinisation treatment bagasse distilled water wash step (1) obtained 3 ~ 4 times, alkali on removing bagasse and other impurity, then drying treatment 2 ~ 3 hours at 65 ~ 75 DEG C, then through mechanical disintegration, obtained particle diameter is 100 ~ 200 object bagasse powders.

(3) raw material is taken according to following mass ratio, the bagasse powder that step (2) is obtained: medium-density polyethylene: benzoyl peroxide: maleic anhydride: silicone oil: clorafin: Dythal=20 ~ 60:10 ~ 50:0.5 ~ 2:1 ~ 4:15 ~ 20:1 ~ 7:0.5 ~ 4.0, raw material is mixed on homogenizer, the rotating speed of homogenizer is 3000 ~ 6000 revs/min, obtained mixture.

(4) by mixture reactive extrursion in twin screw extruder obtained for step (3), extruder temperature is set to 160 ~ 180 DEG C, rotating speed is 300 ~ 500 revs/min, the residence time of material in screw rod is 3 ~ 7 minutes, obtained extrusion moulding sheet material, is polyethylene based wood-plastic composite material.

The inventive method is simple to operate, utilization of waste material, is easy to large-scale promotion, and obtained polyethylene based wood-plastic composite material asepsis environment-protecting, high comprehensive performance, easily processes, and can substitute traditional timber, have a extensive future.

Embodiment

embodiment:

(1) bagasse being immersed in mass percent concentration is alkalinisation treatment 3.5 hours in the aqueous sodium hydroxide solution of 15%, and alkalization temperature is 35 DEG C, obtained alkalinisation treatment bagasse.

(2) by alkalinisation treatment bagasse obtained for step (1) distilled water wash 4 times, the alkali on removing bagasse and other impurity, then drying treatment 2.5 hours at 70 DEG C, then through mechanical disintegration, obtained particle diameter is 150 object bagasse powders.

(3) raw material is taken according to following mass ratio, the bagasse powder that step (2) is obtained: medium-density polyethylene: benzoyl peroxide: maleic anhydride: silicone oil: clorafin: Dythal=40:30:1.2:2.5:18:4:2.3, raw material is mixed on homogenizer, the rotating speed of homogenizer is 4500 revs/min, obtained mixture.

(4) by mixture reactive extrursion in twin screw extruder obtained for step (3), extruder temperature is set to 170 DEG C, and rotating speed is 400 revs/min, and the residence time of material in screw rod is 5 minutes, obtained extrusion moulding sheet material, is polyethylene based wood-plastic composite material.

In the present embodiment, adding of the auxiliary agents such as benzoyl peroxide, maleic anhydride, silicone oil, clorafin and Dythal, make the polyethylene based wood-plastic composite material obtained compared with non-adding assistant, its tensile strength improves 131%, shock strength improves 27%, and water-intake rate is reduced to 0.48%.

Claims (1)

1. utilize bagasse to prepare a method for polyethylene based wood-plastic composite material, it is characterized in that concrete steps are:

(1) bagasse being immersed in mass percent concentration is alkalinisation treatment 3 ~ 4 hours in the aqueous sodium hydroxide solution of 10 ~ 20%, and alkalization temperature is 30 ~ 40 DEG C, obtained alkalinisation treatment bagasse;

(2) alkalinisation treatment bagasse distilled water wash step (1) obtained 3 ~ 4 times, alkali on removing bagasse and other impurity, then drying treatment 2 ~ 3 hours at 65 ~ 75 DEG C, then through mechanical disintegration, obtained particle diameter is 100 ~ 200 object bagasse powders;

(3) raw material is taken according to following mass ratio, the bagasse powder that step (2) is obtained: medium-density polyethylene: benzoyl peroxide: maleic anhydride: silicone oil: clorafin: Dythal=20 ~ 60:10 ~ 50:0.5 ~ 2:1 ~ 4:15 ~ 20:1 ~ 7:0.5 ~ 4.0, raw material is mixed on homogenizer, the rotating speed of homogenizer is 3000 ~ 6000 revs/min, obtained mixture;

(4) by mixture reactive extrursion in twin screw extruder obtained for step (3), extruder temperature is set to 160 ~ 180 DEG C, rotating speed is 300 ~ 500 revs/min, the residence time of material in screw rod is 3 ~ 7 minutes, obtained extrusion moulding sheet material, is polyethylene based wood-plastic composite material.