CN1844220A - Dedicated modified materials for agricultural polyethylene film - Google Patents

Abstract

A special modified material for polyethylene film selecting polyethylene regenerative material as main raw material is prepared by the following charge ratio of raw materials and method: mixing the polyethylene regenerative resin and the dicumyl peroxide, then adding them into bucket of reactive twin-screw set, warming to make molten materials perform chain initiation in charging barrel; adding vinylsilane in the fourth barrel of the charging barrel of the set; adding free radical capture agent and quenching agent to react in the sixth barrel of the charging barrel of the set; after finishing the reaction, the materials going through the shunt board and the screen, squeezed by the die then stayed to stuff; inputting the stuff into dicing cutter to pellet after introduced into bosh to cool. The invention can reduce the cost of the raw materials for film production by 300-500 RMB/ton; can advance the reclamation of waste and old plastics, slow down the while contamination of various plastic products to environment and alleviate the market contradictory problem that the demand for polyvinyl resin exceeds the supply in recent years.

Description

Dedicated modified materials for agricultural polyethylene film

Technical field

The present invention relates to polyvinyl resin modification technology field, particularly a kind of dedicated modified materials for agricultural polyethylene film.

Background technology

Present widely used agricultural with plastics blow molding processing film material mainly with LLDPE (LLDPE) and hp-ldpe (LDPE), high density polyethylene(HDPE) (HDPE) two or three resin alloy after extrude, blowing processes.But owing to be subjected to the influence of international energy crisis in recent years, crude oil price is high, and it is high that this causes its derived product polyvinyl resin price to continue; And plastics, especially agricultural plastic product price come-up are few, so vinyon tubing, film market price raises up thereupon, and wide farmers is difficult to accept.

Summary of the invention

The present invention is main raw material with the recycled polyethylene, process for processing and service performance at the agricultural polyethylene blown film, by the response type twin-screw set it is carried out modification processing, reach and use that the polyethylene agricultural film quality product of blow molding can reach GB4455-94 and the every technical requirements of GB13735-92 (IV class) fully after 60-100% dedicated modified materials for agricultural polyethylene film and 0-40% polyvinyl resin (LDPE or the LLDPE) blend.

The objective of the invention is to be achieved through the following technical solutions:

A kind of dedicated modified materials for agricultural polyethylene film is a main raw material(s) with the recycled polyethylene, is prepared from by following proportioning raw materials and method:

A, with recycled polyethylene resin and dicumyl peroxide with 98-99%: the 1-2% mixing, add response type twin-screw set hopper after, heat, it is chain initiation that the molten state material is produced in barrel;

B, add vinyl silanes at unit barrel the 4th joint cylindrical shell place, it adds overall control at 1-1.5%;

C, add radical scavenger at unit barrel the 6th joint cylindrical shell place and quencher reacts, its add-on is respectively: radical scavenger 1.5-2.5 ‰, quencher 2 ‰-4 ‰;

Reaction finished by d, material after spreader plate, filtering net are extruded through die head, is pulled into the material bar;

E, will expect that bar is introduced the cooling trough cooling after, send into dicing machine, cut into the material grain.

The terminal fast hydraulic pressure draping system of installing of described response type twin screw machine barrel uses 120 order steel meshes to filter out impurities.

Beneficial effect: polyethylene agricultural plastic film raw materials for production polyvinyl resin (LLDPE, LDPE or HDPE) is because supply falls short of demand at present, and price continues high, causes agricultural plastic product substantial appreciation of prices in recent years, and peasant household is difficult to accept; And the vast farmers user is not high to all kinds of waste polyethylene agricultural plastic products recycling enthusiasm on the other hand, cause a large amount of farmlands because the life-time service plastics cause white pollution, its serious harm normal agriculture production, even cause a small amount of farmland to cultivate.

The present invention is a main raw material(s) with the commercial polyethylene reworked material, studies from reworked material ageing resistance and two aspects of processing forming emphatically and breaks through.Using dedicated modified materials to produce agricultural film can make present plastic sheeting for farm use raw materials for production cost reduce 300-500 unit/ton on the one hand; Can promote reclaiming and utilizing waste plastics on the other hand, slow down the white pollution that all types of plastic goods cause environment, alleviate China's polyvinyl resin tight market contradictory problems in recent years.

Embodiment

Below in conjunction with embodiment the present invention is described in more detail:

Embodiment 1

1, with recycled polyethylene resin 98kg and 2kg dicumyl peroxide mixing, behind the adding response type twin-screw set hopper, heat, it is chain initiation that the molten state material is produced in barrel;

2, add vinyl silanes 1.5kg at unit barrel the 4th joint cylindrical shell place;

3, add radical scavenger 0.15kg at unit barrel the 6th joint cylindrical shell place, quencher 0.4kg reacts;

4, material is finished reaction after spreader plate, filtering net use 120 order steel meshes to filter out impurities, and extrudes through die head, is pulled into the material bar;

5, will expect that bar is introduced the cooling trough cooling after, send into dicing machine, cut into the material grain.

Embodiment 2

1, with recycled polyethylene resin 99kg and 1kg dicumyl peroxide mixing, behind the adding response type twin-screw set hopper, heat, it is chain initiation that the molten state material is produced in barrel;

2, add vinyl silanes 1kg at unit barrel the 4th joint cylindrical shell place;

3, add radical scavenger 0.25kg at unit barrel the 6th joint cylindrical shell place, quencher 0.2kg reacts;

4, material is finished reaction after spreader plate, filtering net use 120 order steel meshes to filter out impurities, and extrudes through die head, is pulled into the material bar;

5, will expect that bar is introduced the cooling trough cooling after, send into dicing machine, cut into the material grain.

Claims (2)

1, a kind of dedicated modified materials for agricultural polyethylene film is characterized in that with the recycled polyethylene being main raw material(s), is prepared from by following proportioning raw materials and method:

A, with recycled polyethylene resin and dicumyl peroxide with 98-99%: the 1-2% mixing, add response type twin-screw set hopper after, heat, it is chain initiation that the molten state material is produced in barrel;

B, add vinyl silanes at unit barrel the 4th joint cylindrical shell place, it adds overall control at 1-1.5%;

C, add radical scavenger at unit barrel the 6th joint cylindrical shell place and quencher reacts, its add-on is respectively: radical scavenger 1.5-2.5 ‰, quencher 2 ‰-4 ‰;

Reaction finished by d, material after spreader plate, filtering net are extruded through die head, is pulled into the material bar;

E, will expect that bar is introduced the cooling trough cooling after, send into dicing machine, cut into the material grain.

2, a kind of agricultural polyethylene film modifying material according to claim 1 is characterized in that the terminal fast hydraulic pressure draping system of installing of described response type twin screw machine barrel, uses 120 order steel meshes to filter out impurities.