CN1095327C

CN1095327C - Degradable polyethylene mulching capable of killing weeds and its production process and application

Info

Publication number: CN1095327C
Application number: CN99114386A
Authority: CN
Inventors: 赵志浩
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-12
Filing date: 1999-08-12
Publication date: 2002-12-04
Anticipated expiration: 2019-08-12
Also published as: CN1244549A

Abstract

The present invention relates to a weeding degradable mulching film and a production method and a usage thereof. The mulching film is a polyethylene mulching film containing an agricultural chemical Metolachlor and contains an auxiliary agent and a degrading agent. The present invention has the production process that a modified machine and a twin-screw extruding reactor are used for mixing, processing and granulation; a common plastic film blasting machine is used for blowing the film. The mulching film can be used for dry land crops, such as cotton, flue-cured tobacco, vegetable, fruit, soybeans, corn and sugarcane except the wheat class crops; the mulching film has the advantages of good weeding effect, no phytotoxicity or ineffectiveness, available raw material, low cost, simple processing technology and similar mechanical property to polyethylene; the mulching film can be degraded with a certain time, the residue is nearly powder, and the pharmacodynamic action can vanish naturally and can not cause influence on after crops without any environmental pollution.

Description

A kind of degradable polyethylene mulching capable of killing weeds and production method thereof and purposes

Technical field

The present invention relates to a kind of agripast mulch film.

Background technology

Along with the development of agricultural production and the popularization of new agricultural technology, vast farmers uses weed killer herbicide and mulch film just more and more.The use of these new materials promotes and has kept high yield, the stable yields of crops, has brought huge economic benefit and social benefit to the rural area.But, thereupon also caused the serious environmental pollution problem and to the murder by poisoning of human body.Mainly show: 1, common ground film can remain in the farmland after using, and has a strong impact on crop root and grows, and hinders freely spreading of soil moisture and nutrient, causes soil fertility to descend, and crop yield descends significantly.2, weed killer herbicide is poisonous, may cause the user to poison in the use, the drug effect of weed killer herbicide is subjected to adsorptivity, the permeability of soil moisture content, soil, the influence of soil temperature, the serviceability shakiness, cause poisoning or invalid easily, cause river course, fish pond to pollute or injure other crops of vicinity easily.

At present for addressing these problems the measure of being adopted:

1, development degradative plastic film, but all do not have weeding function.

2, development weed removal mulch film.Existing weed removal mulch film is sold on the market now, but it mainly is to use Acetochlor and polyethylene to mix oven dry, the technology of blown film then.This agricultural chemicals poor heat stability, can Yin Wendu in process too high and decompose, not only cause waste, and the content of dispersion of film is difficult to control, cause invalid or poisoning easily.Simultaneously in drying course agricultural chemicals in a large number volatilization can cause environmental pollution, the serious threat direct labor's is healthy.And this mulch film can not be degraded, and can cause farmland pollution.

Summary of the invention

The objective of the invention is to propose that a kind of to slaughter green bristlegrass amine with agricultural chemicals be that raw material and macromolecular compound polyethylene mix, by adding specific auxiliary agent and degradation agent, but obtain the degradable again mulch film of a kind of weeding with suitable processing technology.And the production method and the purposes of this mulch film proposed.This mulch film can carry out industrialization to be produced continuously, and overcomes the deficiency of this series products in the past, satisfies the requirement of tensile strength, tensile stretch, angle tear strength, light transmittance, ultra-thin, weeding and degradation speed.

Summary of the invention

Main contents of the present invention comprise:

But its composition of the degradable again mulch film of weeding and proportioning percetage by weight are:

A, polyethylene 75-90

B, Tu's green bristlegrass amine 1.0-2.0

C, calcium carbonate 6-20

D, stearic acid monoglycerides 0.1-2.0

e、EVA 0-2.0

F, ferric stearate 0.05-0.12

G, stearic acid 0-1.0

H, Tissuemat E 0-1.0

I, benzophenone 0.01-0.03

With modified mechanical power and twin-screw extrusion reaction machine, accurately measure each component, carry out the hybrid process granulation by proportioning, carry out blown film with conventional plastic film blowing machine.

The preferred LLDPE of polyethylene (LLDPE).EVA promptly is ethene-acetate ethylene copolymer, and its enol content is 10-30%.

Production technology is as follows:

1, by proportioning, accurate each component of weighing:

2, in modified mechanical power, drop into calcium carbonate and stearic acid, stirred about 10 minutes, 100-120 ℃ of control whipping temp;

3, drop into stearic acid monoglycerides and Tissuemat E again, stirred about 8 minutes;

4, be cooled to room temperature with stirring in the above-mentioned finished raw material input cooling machinery, drop into EVA then, it is stand-by that ferric stearate, Tu's green bristlegrass amine and part polyethylene stir about 15 minutes backs, and the ratio of the total amount of polyethylene input amount and other material input amount is about 1: 1;

5, said mixture is evenly added twin-screw extrusion reaction machine, 12 regional temperatures of this extrusion reaction machine are controlled at respectively in the 95-180 ℃ of scope, rotating speed 120-150 rev/min;

6, treat that the die head extrudate is evenly normal after, the bar of extruding is dried up back cutting granulating by bosh and drying air fan, be master batch;

7, mix with above-mentioned master batch with by the polyethylene of proportioning remainder after, add inflation film manufacturing machine charging aperture blown film, temperature is controlled between 130-180 ℃, but regulates the degradable again mulch film of weeding that inflation film manufacturing machine extruded velocity and hauling speed are made into all size.

But the degradable again mulch film of weeding, can use the crops except that the wheat class as: on the dry crops such as cotton, flue-cured tobacco, vegetables, fruit, soybean, corn, sugarcane, can weeding, can degrade within a certain period of time again, do not pollute the environment.

Advantage of the present invention is as follows:

1, is applicable to that industrialization produces continuously;

2, the ground film dynamic performance of being produced approaches polyethylene;

3, each component is evenly disperseed, and slaughters the decomposition of can not volatilizing of green bristlegrass amine in the process, and the mulch film pesticide concentration of production is uniform and stable, can not cause poisoning or invalid, can not cause the environmental pollution of production area;

4, the mulch film degradative phase is 2-4 month, slaughter green bristlegrass amine activity and use back 3-4 month from Lock-out at mulch film, can not cause residual influence to succession crop, behind the ground membrane degradation, plastic foil becomes very small debris particle gradually, intimate Powdered, therefore needn't expend the recovery operation that a large amount of manpower and materials are carried out discarded object, residue can not pollute the soil;

5. processing technology is simple, carries out mulch film and adds man-hour, can adopt conventional process equipment, and raw material is easy to get, and product cost is low.

Embodiment

Embodiment:

By following proportioning, accurate each component of weighing:

Weight percentages of components (%)

Polyethylene 90

Slaughter green bristlegrass amine 1.5

Calcium carbonate 7

Stearic acid list sweet sour 0.6

EVA 0.4

Ferric stearate 0.1

Stearic acid 0.13

Tissuemat E 0.25

Benzophenone 0.02

In agitator, drop into calcium carbonate and stearic acid by proportioning, stirred 10 minutes, 100-120 ℃ of control whipping temp, drop into stearic acid monoglycerides and Tissuemat E again, stirred 8 minutes, be cooled to room temperature then, drop into EVA, ferric stearate, Tu's green bristlegrass amine then and drop into the polyethylene (10 parts) of equivalent, stir and mixed in 15 minutes.Said mixture is evenly added twin-screw extrusion reaction machine, 12 regional temperatures of this extrusion reaction machine are controlled at respectively in the 95-180 ℃ of scope, rotating speed 120-150 rev/min, treat that the die head extrudate dries up cutting granulating in back with the bar of extruding by bosh and drying air fan after evenly normal, is master batch.Above-mentioned master batch and 80 parts of remaining polyethylene are mixed back adding inflation film manufacturing machine charging aperture blown film, and temperature is controlled between 130-180 ℃.Regulate inflation film manufacturing machine extruded velocity and hauling speed, can make mulch film product of the present invention.

Claims

1, a kind of polyethylene ground film, but it is characterized in that its weeding degradable again, and it is formed and the proportioning percetage by weight is:

A, polyethylene 75-90

B, Tu's green bristlegrass amine 1.0-2.0

C, calcium carbonate 6-20

D, stearic acid monoglycerides 0.1-2.0

e、EVA 0-2.0

F, ferric stearate 0.05-0.12

G, stearic acid 0-1.0

H, Tissuemat E 0-1.0

I, benzophenone 0.01-0.03

Carry out the hybrid process granulation with modified mechanical power and twin-screw extrusion reaction machine by proportioning, carry out blown film with conventional plastic film blowing machine.

2, mulch film according to claim 1 is characterized in that polyethylene is LLDPE (LLDPE), and enol content is 10-30% among the EVA.

3, a kind of method of product of production claim 1 is characterized in that adopting following process conditions:

(1) by each set of dispense ratio, accurately metering;

(2) in modified mechanical power, drop into calcium carbonate and stearic acid stirring 10 minutes, 100-120 ℃ of control whipping temp;

(3) dropping into stearic acid monoglycerides and Tissuemat E again stirred 8 minutes;

(4) be cooled to room temperature with stirring in the above-mentioned finished raw material input cooling machinery, drop into EVA then, ferric stearate is slaughtered green bristlegrass amine and part polyethylene, stirs 15 minutes stand-by, the ratio of polyethylene input amount and other material input amount total amount is 1: 1;

(5) said mixture is evenly added twin-screw extrusion reaction machine, 12 regional temperatures of this reaction machine are controlled at respectively in the 95-180 ℃ of scope, rotating speed 120-150 rev/min;

(6) treat that the die head extrudate is evenly normal after, the bar of extruding is dried up back cutting granulating by bosh and drying air fan, be master batch;

(7) with above-mentioned master batch with mix the back by the polyethylene of proportioning remainder and add inflation film manufacturing machine charging aperture blown film, temperature is controlled between 130-180 ℃;

Regulate the mulch film that inflation film manufacturing machine extruded velocity and hauling speed are made into all size.

4, the purposes of the product of claim 1 is characterized in that can using on cotton, flue-cured tobacco, vegetables, fruit, soybean, corn, sugarcane crop.