CN103819739A - Preparation method of degradable environment-friendly shopping bag - Google Patents

Abstract

The invention discloses a preparation method of a degradable environment-friendly shopping bag. The preparation method comprises the following steps: 1) taking an appropriate amount of water, heating to 75-85 DEG C, adding 100 parts of vegetable starch, and stirring to obtain starch paste; 2) placing 1-2 parts of stearic acid, 1.5-2.5 parts of calcium stearate, 1.5-2.5 parts of a titanate coupling agent, 4-6 parts of heavy calcium carbonate powder, 2-4 parts of liquid paraffin, 14-16 parts of ethylene-methyl acrylate copolymer, 15-17 parts of low density polyethylene, 6-8 parts of linear polyethylene, and 13-15 parts of high density polyethylene into a high-speed kneading machine according to a certain ratio, heating to 115-125 DEG C, starting to stir, stirring for 14-16 minutes, adding the starch paste, stirring for 8-10 minutes to obtain a mixture; 3) placing the mixture in a twin-screw extruder, pelletizing at 165-175 DEG C, and adopting a single-screw blowing machine for film blowing at 160-170 DEG C, and so that the shopping bag is prepared.

Description

A kind of preparation method of Degradable environment protection shopping bag

Technical field

The present invention relates to field of packaging material, relate in particular to a kind of preparation method of Degradable environment protection shopping bag.

Background technology

The shopping bag that supermarket, market, country fair etc. provide is all to adopt the polymer materialss such as polystyrene, polyethylene, polypropylene to make substantially, because they cannot be degraded, ecotope is done great damage, threatening the space of human survival, people are referred to as " white pollution ".For this reason, general office of State Council of the People's Republic of China has issued " selling the notice that uses plastic shopping bag about limit production ".According to notice, in view of shopping bag becomes the main source of " white pollution ", the various places People's Government, ministries and commissions etc. should forbid producing, selling and uying super-thin plastic shopping bag, and will carry out plastic shopping bag Paid Use System from now on.From 1 day June in 2008, plastic shopping bag Paid Use System was carried out in commodity retail place in all supermarkets, market, country fair etc., must not provide free without exception plastic shopping bag.Although paid utilization has limited the shopping bag of some amount, the pollution problem of shopping bag itself is not still resolved.

For this reason, people start degradable package bag to study gradually, and increasing degradative plastics goods start to emerge in large numbers.But always there is such or such deficiency in current degradation products.At present many is that employing petroleum-based plastics polyolefine material is that carrier is prepared degradative plastics, or adopt the polylactic acid-based macromolecular material of preparing from crude substance to improve the biological degradability of degradative plastics, but, the resistance toheat deficiency of material after processing, be difficult to meet the service requirements of shopping bag, and the cost compare of poly(lactic acid) is high.

For example, application number is the blend that has adopted degradable high polymer material and natural macromolecular material in 200710190063.8 patent, to solving the contradiction between Performance and Cost Modeling, wherein, the content of poly(lactic acid) and thermoplastic starch is 1: 1 substantially, although this scheme makes moderate progress to the performance of product, still not ideal enough and cost is still very high.

Summary of the invention

The object of the invention is to propose a kind of preparation method of Degradable environment protection shopping bag, the method, by the adjustment of shopping bag component, its natural degradation rate is reached more than 60%, and the obdurability of shopping bag is good, meet service requirements, and preparation cost is low.

For reaching this object, the present invention by the following technical solutions:

A kind of preparation method of Degradable environment protection shopping bag, the composition of this shopping bag is made up of following component in weight part: 100 parts of plant amylums, stearic acid 1-2 part, calcium stearate 1.5-2.5 part, titanate coupling agent 1.5-2.5 part, heavy calcium carbonate 4-6 part, whiteruss 2-4 part, ethylene-methyl acrylate copolymer 14-16 part, Low Density Polyethylene 15-17 part, linear polyethylene 6-8 part, high density polyethylene(HDPE) 13-15 part; Described preparation method is:

1) get suitable quantity of water, be heated to 75-85 ℃, plant amylum is added, stir into starch paste;

2) in proportion stearic acid, calcium stearate, titanate coupling agent, heavy calcium carbonate, whiteruss, ethylene-methyl acrylate copolymer, Low Density Polyethylene, linear polyethylene, high density polyethylene(HDPE) are put into high-speed kneading machine, be heated to 115-125 ℃ and start stir, stir 14-16 minute, then add the 1st) starch paste of step, stir 8-10 minute, obtain compound;

3) by the 2nd) compound prepared of step puts into twin screw extruder, granulation on twin screw extruder at 165-175 ℃ of temperature, then adopt single Screw Extrusion blow moulding machine Blown Film at 160-170 ℃, be then prepared into shopping bag.

Beneficial effect of the present invention is:

1) the present invention is take starch as base, coordinate appropriate additive, and add the obdurability of appropriate polyvinyl resin assurance shopping bag, obtained good technique effect, specific targets are as follows: tensile strength > 45MPa, elongation at break >=220%.

2) the present invention is take starch as main body, and natural degradation rate reaches more than 60%, residue do not degrade component recyclable, also can burning disposal, when burning, produce without hazardous and noxious substances, therefore this shopping bag good environmental protection.

Embodiment

Embodiment mono-

A kind of preparation method of Degradable environment protection shopping bag, the composition of this shopping bag is made up of following component in weight part: 100 parts of plant amylums, 1 part of stearic acid, 2.5 parts of calcium stearates, 1.5 parts of titanate coupling agents, 6 parts of heavy calcium carbonates, 2 parts of whiterusss, 16 parts of ethylene-methyl acrylate copolymers, 15 parts of Low Density Polyethylenes, 8 parts of linear polyethylenes, 13 parts of high density polyethylene(HDPE)s; Described preparation method is:

1) get suitable quantity of water, be heated to 75 ℃, plant amylum is added, stir into starch paste;

2) in proportion stearic acid, calcium stearate, titanate coupling agent, heavy calcium carbonate, whiteruss, ethylene-methyl acrylate copolymer, Low Density Polyethylene, linear polyethylene, high density polyethylene(HDPE) are put into high-speed kneading machine, be heated to 115 ℃ and start stir, stir 16 minutes, then add the 1st) starch paste of step, stir 8 minutes, obtain compound;

3) by the 2nd) compound prepared of step puts into twin screw extruder, granulation on twin screw extruder at 165 ℃ of temperature, then adopt single Screw Extrusion blow moulding machine Blown Film at 170 ℃, be then prepared into shopping bag.

Embodiment bis-

A kind of preparation method of Degradable environment protection shopping bag, the composition of this shopping bag is made up of following component in weight part: 100 parts of plant amylums, 2 parts of stearic acid, 1.5 parts of calcium stearates, 2.5 parts of titanate coupling agents, 4 parts of heavy calcium carbonates, 4 parts of whiterusss, 14 parts of ethylene-methyl acrylate copolymers, 17 parts of Low Density Polyethylenes, 6 parts of linear polyethylenes, 15 parts of high density polyethylene(HDPE)s; Described preparation method is:

1) get suitable quantity of water, be heated to 85 ℃, plant amylum is added, stir into starch paste;

2) in proportion stearic acid, calcium stearate, titanate coupling agent, heavy calcium carbonate, whiteruss, ethylene-methyl acrylate copolymer, Low Density Polyethylene, linear polyethylene, high density polyethylene(HDPE) are put into high-speed kneading machine, be heated to 125 ℃ and start stir, stir 14 minutes, then add the 1st) starch paste of step, stir 10 minutes, obtain compound;

3) by the 2nd) compound prepared of step puts into twin screw extruder, granulation on twin screw extruder at 175 ℃ of temperature, then adopt single Screw Extrusion blow moulding machine Blown Film at 160 ℃, be then prepared into shopping bag.

Embodiment tri-

A kind of preparation method of Degradable environment protection shopping bag, the composition of this shopping bag is made up of following component in weight part: 100 parts of plant amylums, 1.5 parts of stearic acid, 2 parts of calcium stearates, 2 parts of titanate coupling agents, 5 parts of heavy calcium carbonates, 3 parts of whiterusss, 15 parts of ethylene-methyl acrylate copolymers, 16 parts of Low Density Polyethylenes, 7 parts of linear polyethylenes, 14 parts of high density polyethylene(HDPE)s; Described preparation method is:

1) get suitable quantity of water, be heated to 80 ℃, plant amylum is added, stir into starch paste;

2) in proportion stearic acid, calcium stearate, titanate coupling agent, heavy calcium carbonate, whiteruss, ethylene-methyl acrylate copolymer, Low Density Polyethylene, linear polyethylene, high density polyethylene(HDPE) are put into high-speed kneading machine, be heated to 120 ℃ and start stir, stir 15 minutes, then add the 1st) starch paste of step, stir 9 minutes, obtain compound;

3) by the 2nd) compound prepared of step puts into twin screw extruder, granulation on twin screw extruder at 170 ℃ of temperature, then adopt single Screw Extrusion blow moulding machine Blown Film at 165 ℃, be then prepared into shopping bag.

Claims (1)

1. the preparation method of a Degradable environment protection shopping bag, it is characterized in that, the composition of this shopping bag is made up of following component in weight part: 100 parts of plant amylums, stearic acid 1-2 part, calcium stearate 1.5-2.5 part, titanate coupling agent 1.5-2.5 part, heavy calcium carbonate 4-6 part, whiteruss 2-4 part, ethylene-methyl acrylate copolymer 14-16 part, Low Density Polyethylene 15-17 part, linear polyethylene 6-8 part, high density polyethylene(HDPE) 13-15 part; Described preparation method is:

1) get suitable quantity of water, be heated to 75-85 ℃, plant amylum is added, stir into starch paste;

2) in proportion stearic acid, calcium stearate, titanate coupling agent, heavy calcium carbonate, whiteruss, ethylene-methyl acrylate copolymer, Low Density Polyethylene, linear polyethylene, high density polyethylene(HDPE) are put into high-speed kneading machine, be heated to 115-125 ℃ and start stir, stir 14-16 minute, then add the 1st) starch paste of step, stir 8-10 minute, obtain compound;

3) by the 2nd) compound prepared of step puts into twin screw extruder, granulation on twin screw extruder at 165-175 ℃ of temperature, then adopt single Screw Extrusion blow moulding machine Blown Film at 160-170 ℃, be then prepared into shopping bag.