CN109749473A - A kind of PE matrix plastic-wood section and preparation method thereof that Chitosan is modified - Google Patents

Abstract

The present invention relates to field of compound material, a kind of PE matrix plastic-wood section that Chitosan is modified, including following mass fraction component are disclosed: PE:30-45 parts；Chitosan: 5-20 parts；Lubricant: 0.5-4 parts；Plant fiber: 50-65 parts；Antioxidant: 0.3-2 parts.The invention also discloses preparation methods.The modified PE matrix plastic-wood section of Chitosan of the invention, preferably improves the interface interaction power and interface compatibility of wood powder and PE, has good mechanical property.

Description

A kind of PE matrix plastic-wood section and preparation method thereof that Chitosan is modified

Technical field

The present invention relates to field of compound material, and in particular to a kind of PE matrix plastic-wood section and its preparation that Chitosan is modified Method.

Background technique

In recent years, the market demand of woodwork is increasing, and the forest reserves are but constantly being reduced.A large amount of woodworks simultaneously The leftover bits such as processing waste such as sawdust, wood shavings and a large amount of agronomic crop fibre such as rice husk, wheat straw, cotton stalk etc. are but often It is incinerated waste and greatly pollution is generated to environment.According to statistics, China is every year since timber processes remaining discarded sawdust amount More than millions of tons, the amount of other natural fibers such as rice chaff etc. also has up to ten million tons.

With the development of the social economy, plastic products are widely used in the every field of production and living, thus And what is generated is largely difficult to the waste degraded and gives environment bring white pollution problems, also increasingly by the weight of people Depending on.

The aggravation of the environmental problem and shortage of resources that get worse using plant fiber and plastics so that synthesized a kind of new Type composite material, Wood plastic composite (wood/plastics polymer composites, WPC) is increasingly by people's Concern.

Plastic-wood material is exactly a kind of new material that can replace timber well.Moulding the wooden technology of preparing is in recent years at home and abroad Develop a kind of faster new material processing technology.So-called modeling wood, is exactly the combination of solid wood and plastics, it both maintains solid wood Compatibility, and there are the performances such as good moisture-proof water-fast, acid and alkali-resistance, Anti-moth-eating, and with its novel idea, novel set Meter, novel product greatly advance the development of new material industry.

However, major part PE matrix plastic-wood section a kind of surface co-extrusion PE as disclosed in CN201210592298.0 on the market Plastic-wood section, has preferable mechanical property, and fungicidal properties is poor.The mould proof antistatic as disclosed in CN201210087367.2 Wood plastic composite, is carried out mould proof using preservative, and preservative is unobvious to the promotion of sheet mechanical property.

Summary of the invention

The purpose of the present invention is to provide a kind of modified PE matrix plastic-wood sections of Chitosan, overcome lacking for the prior art Point has preferable mechanical property and fungicidal properties.

Technical scheme is as follows:

A kind of PE matrix plastic-wood section that Chitosan is modified, including following mass fraction component:

PE:30-45 parts；

Chitosan: 5-20 parts；

Lubricant: 0.5-4 parts；

Plant fiber: 50-65 parts；

Antioxidant: 0.3-2 parts.

Further, the deacetylation of chitosan is 92%.

Further, plant fiber includes at least one of wood-fibred, bamboo fibre.

Further, wood-fibred is the wood-fibred of 40-80 mesh.

Further, lubricant includes at least one of solid paraffin, zinc stearate.

Further, PE is that HDPE regenerates grain.

Further, the MI range of PE is 0.5-0.8g/cm³, test parameter is 190 DEG C, 2.16kg.

A kind of preparation method of chitin modified PE matrix plastic-wood section, includes the following steps:

A. plant fiber uses preceding drying, is allowed to moisture and is no more than 2%,

B. by PE, chitosan, lubricant, plant fiber, 600 turns/min of high-speed stirred is stirred 3-8 minutes antioxidant in proportion；

C. the material extruding pelletization that will be stirred evenly；

D. the material after being granulated is extruded into plastic-wood section.

For the present invention using plant fiber as packing material, polyethylene (PE) is basis material, and it is poly- to prepare shell using extrusion molding Sugared modified plant fibers/PE Wood plastic composite add chitosan, preferably improve interface interaction power and the interface of wood powder and PE Compatibility, improves the mechanical property of composite material, and tensile strength, impact strength, bending strength and endurance ratio are not added with all There is increase, and the fungicidal properties of Wood plastic composite also has promotion.

Specific embodiment

Below in conjunction with specific embodiment, present invention is further described in detail.

Embodiment 1

A kind of PE matrix plastic-wood section that Chitosan is modified, including following mass fraction component:

HDPE regenerates grain 35Kg, and MI range is 0.5-0.8g/cm3 (190 DEG C, 2.16kg)；

Chitosan 5Kg；

Solid paraffin 2Kg；

40 mesh wood-fibred 65Kg；

Commercially available Conventional antioxidants 0.3Kg.

Embodiment 2

A kind of PE matrix plastic-wood section that Chitosan is modified, including following mass fraction component:

HDPE regenerates grain 35Kg, and MI range is 0.5-0.8g/cm3 (190 DEG C, 2.16kg)；

Chitosan 10Kg；

Zinc stearate 2Kg；

80 mesh wood-fibred 65Kg；

Commercially available Conventional antioxidants 0.3Kg.

Embodiment 3

A kind of PE matrix plastic-wood section that Chitosan is modified, including following mass fraction component:

HDPE regenerates grain 30Kg, and MI range is 0.5-0.8g/cm3 (190 DEG C, 2.16kg)；

Chitosan 20Kg；

Zinc stearate 2Kg；

Solid paraffin 2Kg；

50 mesh wood-fibred 50Kg；

Commercially available Conventional antioxidants 2Kg.

Embodiment 4

A kind of PE matrix plastic-wood section that Chitosan is modified, including following mass fraction component:

HDPE regenerates grain 45Kg, and MI range is 0.5-0.8g/cm3 (190 DEG C, 2.16kg)；

Chitosan 13Kg；

Zinc stearate 0.2Kg；

Solid paraffin 0.2Kg；

50 mesh bamboo fibre 57Kg；

Commercially available Conventional antioxidants 1Kg.

Comparative example 1

A kind of PE matrix plastic-wood section, including following mass fraction component:

HDPE regenerates grain 35Kg, and MI range is 0.5-0.8g/cm3 (190 DEG C, 2.16kg)；

Solid paraffin 2Kg；

40 mesh wood-fibred 65Kg；

Commercially available Conventional antioxidants 0.3Kg.

Embodiment 1-4 and comparative example 1 the preparation method is as follows:

A. wood-fibred uses preceding drying, is allowed to moisture and is no more than 2%,

B. 600 turns/min of high-speed stirred bucket is used to stir in proportion 8 minutes each material；

C. the material stirred evenly is passed through into parallel double-screw extruding pelletization；

The temperature parameter of double screw extruder are as follows:

1st area

2nd area

3rd area

4th area

5th area

6th area

7th area

8th area

170℃

170℃

190℃

200℃

200℃

160℃

140℃

140℃

D. the material after being granulated is extruded into plastic-wood section with double 65# are bored.

Bore the temperature parameter of double extruders are as follows:

1st area	2nd area	3rd area	4th area
				180℃	200℃	150℃	140℃

In order to further illustrate the present invention, Mechanics Performance Testing is carried out to embodiment 1-2 and comparative example 1, test result is as follows:

Test item	Tensile strength (MPa)	Impact strength (J/m)	It withstands forces (N)	Bending strength (MPa)
					Comparative example 1	17.35	20.45	4125.8	20.6
Embodiment 1	19.56	33.67	4358.7	21.4
					Embodiment 2	20.68	41.75	4503.6	22.1

As can be seen that with the addition of chitosan, degree of drawing, impact strength, endurance and the bending strength of Wood plastic composite There is different degrees of raising.

Fungicidal properties test is carried out to embodiment 1-2 and comparative example 1, test result is as follows:

Project	Mould proof grade
		Comparative example 1	G1
Embodiment 1	G0
		Embodiment 2	G0

It can be seen that chitin modified PE matrix Wood plastic composite fungicidal properties also has promotion.

Although description of this invention combination embodiments above carries out, those skilled in the art Member can carry out many replacements based on the above contents, modifications and variations, be obvious.Therefore, all such substitutions, Improvements and changes are included in the spirit and scope of appended claims.

Claims (8)

1. a kind of modified PE matrix plastic-wood section of Chitosan, which is characterized in that including following mass fraction component:

PE:30-45 parts；

Chitosan: 5-20 parts；

Lubricant: 0.5-4 parts；

Plant fiber: 50-65 parts；

Antioxidant: 0.3-2 parts.

2. the modified PE matrix plastic-wood section of Chitosan according to claim 1, which is characterized in that the chitosan Deacetylation is 92%.

3. the modified PE matrix plastic-wood section of Chitosan according to claim 1, which is characterized in that the plant fiber Including at least one of wood-fibred, bamboo fibre.

4. the modified PE matrix plastic-wood section of Chitosan according to claim 3, which is characterized in that the wood-fibred is The wood-fibred of 40-80 mesh.

5. the modified PE matrix plastic-wood section of Chitosan according to claim 1, which is characterized in that the lubricant packet Include at least one of solid paraffin, zinc stearate.

6. the modified PE matrix plastic-wood section of Chitosan according to claim 1, which is characterized in that the PE is HDPE Regenerate grain.

7. the modified PE matrix plastic-wood section of Chitosan according to claim 6, which is characterized in that the MI model of the PE It encloses for 0.5-0.8g/cm³, test parameter is 190 DEG C, 2.16kg.

8. the preparation of PE matrix plastic-wood section chitin modified described in -7 any one, feature exist according to claim 1 In including the following steps:

A. plant fiber uses preceding drying, is allowed to moisture and is no more than 2%,

B. by PE, chitosan, lubricant, plant fiber, 600 turns/min of high-speed stirred is stirred 3-8 minutes antioxidant in proportion；

C. the material extruding pelletization that will be stirred evenly；

D. the material after being granulated is extruded into plastic-wood section.