CN1872512A - Section material synthesized from rice hull, and preparation method - Google Patents

Abstract

A synthetic material with high density, mechanical performance, insulation to heat and sound, resistance to fire, corrosion and ageing, and mach inability is proportionally prepared from rice husk powder, plastic resin, calcium carbonate, flame-retarding agent, anti-ageing agent, lubricant and brightening agent through proportional mixing, kneading, dual-screw extruding out while shaping and cooling.

Description

A kind of section material synthesized from rice hull and preparation method thereof

Technical field

The present invention relates to a kind of section material synthesized from rice hull and preparation method thereof, is to utilize paddy to grind discarded object section material synthesized from rice hull after the rice and preparation method thereof specifically.

Background technology

Rice husk is the byproduct of quantity maximum in the rice process, accounts for 20% of paddy by weight.Average annual more than 200,000,000 tons of China's rice yield ranks first in the world, and single rice husk annual production reaches 4,000 ten thousand tons.Extensive studies has been carried out in the comprehensive utilization of rice husk both at home and abroad for a long time, obtained many for the approach that utilizes.But really can form large-scale production, what can consume rice husk in a large number utilizes approach and few, or economic benefit significantly increment is little; Or on technology, technical, qualitatively, also there are some problems in aspect such as environmental pollution.Therefore, many local rice husk as discarded object, this still to the significant wastage of resource, does not bring about great losses economically, and environment has also been caused very big pollution.Researching and solving the reasonable utilization of rice husk, turn waste into wealth, is the far reaching task of pendulum in face of us.

Summary of the invention

The object of the present invention is to provide a kind of have good mechanical performance, heat endurance, pollution-free, corrosion-resistant, ageing-resistant, that cost is low section material synthesized from rice hull and preparation method thereof.

Section material synthesized from rice hull of the present invention is made up of the batching of following percentage by weight:

Powdered rice hulls 40-70%

Plastics resin 15-30%

Calcium carbonate 8-20%

Fire retardant 2-3%

Antiaging agent 1-3%

Lubricant 1-3%

Brightener 1-2%

Each content percentage sum of preparing burden equals 100%.

Among the present invention, said rice husk is the shell of paddy rice.Said calcium carbonate, fire retardant, antiaging agent, lubricant, brightener and plastics resin are commercially available industrial or commodity that chemical industry is used.The plastics resin can be PVC (polyvinyl chloride), PP (polypropylene), PE/EVA (polyethylene), PS/ABS (polystyrene) or waste or used plastics.

The preparation method of section material synthesized from rice hull of the present invention, step is as follows:

1) rice husk is dried to moisture at 8-12%, is crushed to the 50-400 order then;

2) get batching in proportion, insert in the refiner after batching is mixed, under 130-200 ℃ of condition, rub refining 15-25 minute;

3) compound of rubbing after the refining is extruded cooling forming with the double helix extruder.

Beneficial effect of the present invention is:

1. with low cost, the material source abundance, the preparation method is simple, in the preparation process, need not add the adhesive of any chemical synthesis, and is nonpoisonous and tasteless.

2. powdered rice hulls is broken to the 50-400 order, is beneficial to and reduces feed particles and be in contact with one another area with gap between particles, increase, the section bar product compactness that makes is good, has good mechanical intensity.

3. section material appearance fineness is good, can be used for the ground decoration, flower bed decoration, construction and decoration, furniture manufacturing on outdoor guardrail, floor, balustrade and railing, pavement and life with fields such as woodworks.Have sound-absorbing, heat insulation, fire prevention, corrosion-resistant simultaneously, ageing-resistant, easily processing can be dug, saws, advantage such as cutter.Along with the development of the urban construction of ecological environment greening, demand exterior decoration material will get more and more, and a kind of very large development space will be provided for the utilization of agricultural organic waste.

The specific embodiment

Table 1 shows composition ingredients by weight percentage and the mechanical property thereof of three embodiment of section material synthesized from rice hull.

Embodiment 1 preparation method, step is as follows:

1) rice husk is dried to moisture 8%, put into pulverizer then and be crushed to 50 orders;

2) get batching in proportion, insert in the refiner after batching is mixed, under 130 ℃ of conditions, rub refining 25 minutes;

3) compound of rubbing after the refining is extruded cooling forming with the double helix extruder.

Embodiment 2 preparation methods, step is as follows:

1) rice husk is dried to moisture 10%, put into pulverizer then and be crushed to 200 orders;

2) get batching in proportion, insert in the refiner after batching is mixed, under 160 ℃ of conditions, rub refining 20 minutes;

3) compound of rubbing after the refining is extruded cooling forming with the double helix extruder.

Embodiment 3 preparation methods, step is as follows:

1) rice husk is dried to moisture 12%, put into pulverizer then and be crushed to 400 orders;

2) get batching in proportion, insert in the refiner after batching is mixed, under 200 ℃ of conditions, rub refining 15 minutes;

3) compound of rubbing after the refining is extruded cooling forming with the double helix extruder.

Table 1

Embodiment		1	2	3
					Batching and percentage by weight thereof	Powdered rice hulls	40	60	70
The plastics resin	30	20	15
				Calcium carbonate		20	15	8
Fire retardant	2	2	3
				Antiaging agent		3	1	2
Lubricant	3	1	1
				Brightener		2	1	1
Mechanical property	Young's modulus N/mm 2	3194.52	3375.24						3245.51
				Elongation at break %	1.58	1.51	1.52
	Fracture strength MPa	33.74	32.76					31.91
				Rockwell hardness (HRR)	96.52	94.65	95.47
	Tensile strength kj/m 2	2.585	2.513					2.479

Claims (3)

1. section material synthesized from rice hull is characterized in that this section bar is made up of the batching of following percentage by weight:

Powdered rice hulls 40-70%

Plastics resin 15-30%

Calcium carbonate 8-20%

Fire retardant 2-3%

Antiaging agent 1-3%

Lubricant 1-3%

Brightener 1-2%

Each content percentage sum of preparing burden equals 100%.

2. section material synthesized from rice hull according to claim 1 is characterized in that said plastics resin is PVC, PP, PE/EVA, PS/ABS or waste or used plastics.

3. the preparation method of section material synthesized from rice hull according to claim 1 is characterized in that step is as follows:

1) rice husk is dried to moisture at 8-12%, is crushed to the 50-400 order then;

2) get batching in proportion, insert in the refiner after batching is mixed, under 130-200 ℃ of condition, rub refining 15-25 minute;

3) compound of rubbing after the refining is extruded cooling forming with the double helix extruder.