CN1095667A

CN1095667A - Air permeable anticorrosive plastic film and preparation method thereof

Info

Publication number: CN1095667A
Application number: CN 93106639
Authority: CN
Inventors: 凌海波; 凌凡
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-27
Filing date: 1993-05-27
Publication date: 1994-11-30

Abstract

What the present invention relates to is a kind of air permeable anticorrosive plastic film and preparation method thereof.Its product consists of polyethylene 50～70%, EVA20～40%, diatomite or calcium phosphate or active carbon 5～10%, bacteriostatic agent 0.1～1%.Earlier EVA and bacteriostatic agent are mixed under 50～60 ℃ of conditions, add polyethylene, diatomite or calcium phosphate or active carbon more successively, under 120～160 ℃, extrude blown film.Method of the present invention is simple, and the permeability of product is good, and anti-corrosive properties are good and effect is lasting.The polybag of making can be used for the fresh-keeping of vegetables, fruit.

Description

Air permeable anticorrosive plastic film and preparation method thereof

What the present invention relates to is a kind of composition of macromolecular compound, particularly only reacts the composition of the macromolecular compound that obtains with carbon-to-carbon unsaturated bond.The invention still further relates to a kind of processing of polymer substance or the technical process of batching.

Application number is the manufacture method of the fruit-vegetable plastic wrap announced in 90110361.6 the patent application document, and providing a kind of is the preparation method of the plastic foil that is used for fruit fresh-keeping of raw material with low density polyethylene (LDPE), zeolite, bactericide, coupling agent.The plastic foil that adopts this method to make has certain pumping property, can adsorb the gases such as ethene that fruit, vegetables are emitted in storage, has certain bactericidal property simultaneously again.But through practice after a while, its permeability also is not very good, and fungistatic effect is lasting inadequately, and fresh-keeping effect remains further to be improved.

The object of the present invention is to provide a kind of plastic foil and preparation method thereof with high ventilation, antiseptic property.

The objective of the invention is to realize by following means:

Its product consists of: polyethylene 50～70%, EVA20～40%, diatomite or calcium phosphate or active carbon 5～10%, bacteriostatic agent 0.1～1%.

Bacteriostatic agent wherein is the mixture of the mixture of vanillic aldehyde and Benzyl Benzoate fat BHA or cinnamic acid, eugenol and Benzyl Benzoate fat, BHA preferably.

Its processing method is: earlier EVA and bacteriostatic agent are fully mixed under 50～60 ℃ of conditions, add any one among polyethylene and diatomite or calcium phosphate or the active carbon three more successively, if diatomite, be diatomite through surperficial organic process, the material that mixes is added in the blown film extruder, under 120～160 ℃, extrude blown film.

The present invention has increased activation diatomite, EVA in the polyethylene base-material, improved film permeability and fillers dispersed, makes fresh-keeping effect more obvious.Increase vanillic aldehyde or cinnamic acid as bacteriostatic agent, strengthened inhibition effect fruit, vegetables rotten fungus.Because vanillic aldehyde adds among the EVA after handling through BHA, Benzyl Benzoate fat, makes fungistatic effect lasting, is uniformly dispersed in film, add polyethylene again, activation diatomite is made plastic sheeting, make that controlled atmosphere function and anti-corrosion function are better to combine.Natural plant extracts such as vanillic aldehyde or cinnamic acid is as the Main Ingredients and Appearance of bacteriostatic agent, to human body safety, have no side effect.Process of the present invention is simple, with low cost.Adopt product of the present invention to make freshness protection package, can be applied to the storage of different types of fruit or Vegetable Preservation, for example capsicum is packed in this freshness protection package, put into 9～12 ℃ of relative humidity 80～85%, in the draughty storage, freshness-retained 2～4 months, fruit was not weightless, annesl not, good fruit rate＞90%, rotting rate＜10%.

For example the present invention is done detailed description below:

Embodiment 1:

After at first getting 50% vanillic aldehyde, 49% Benzyl Benzoate fat and mixing, add 1%BHA again and mix with it and make bacteriostatic agent.Getting 0.2% bacteriostatic agent adds among 20% the EVA and mixes down at 50～60 ℃, add 69.8% low density polyethylene (LDPE) and 10% diatomite more successively through surperficial organic process, mixing back adding blown film extrudes in the unit hopper, extrude blown film at 120～160 ℃, curl, make fruit and vegetable gas regulated preserving freshness protection package.

Embodiment 2:

Will 0.2% bacteriostatic agent add in the 39.8%EVA and mix, add successively again after 50% low density polyethylene (LDPE), 10% diatomite mix, drop into blown film and extrude in the unit hopper, extrude at 120～160 ℃, blown film, curl, bag.Be used for preservation of gartic bolt.

Embodiment 3:

Will 0.3% bacteriostatic agent add in the 30%EVA and mix, after adding 59.7% low density polyethylene (LDPE), 10% diatomite more successively and mixing, drop into blown film and extrude in the unit hopper, extrude at 120～160 ℃, blown film, curl, bag.It is fresh-keeping to be used for watermelon.

Embodiment 4:

Get 33% cinnamic acid, 33% eugenol and add in 33% the Benzyl Benzoate fat and stir, add 1% BHA again and mix with it and make bacteriostatic agent.With mixing down at 50～60 ℃ among 0.5% the bacteriostatic agent adding 25%EVA, add 65% low density polyethylene (LDPE) and 9.5% calcium phosphate activator more successively, add after mixing to extrude in the inflation film manufacturing machine and extrude blown film, curling, bag at 120～160 ℃.It is fresh-keeping to be used for citrus.

Claims

1, a kind of air permeable anticorrosive plastic film is characterized in that: its product consists of polyethylene 50～70%, EVA20～40%, diatomite or calcium phosphate or active carbon 5～10%, bacteriostatic agent 0.1～1%.

2, air permeable anticorrosive plastic film according to claim 1 is characterized in that: described bacteriostatic agent is the mixture of vanillic aldehyde, Benzyl Benzoate fat, BHA, and it consists of vanillic aldehyde 50%, Benzyl Benzoate fat 49%, BHA1%.

3, air permeable anticorrosive plastic film according to claim 1 is characterized in that: described bacteriostatic agent is the mixture of cinnamic acid, eugenol, Benzyl Benzoate fat, BHA, and it consists of cinnamic acid 33%, eugenol 33%, Benzyl Benzoate fat 33%, BHA1%.

4, air permeable anticorrosive plastic film according to claim 2 is characterized in that: product consists of bacteriostatic agent 0.2%, EVA20%, low density polyethylene (LDPE) 69.8%, diatomite 10%.

5, air permeable anticorrosive plastic film according to claim 2 is characterized in that: product consists of bacteriostatic agent 0.2%, EVA39.8%, low density polyethylene (LDPE) 50%, diatomite 10%.

6, air permeable anticorrosive plastic film according to claim 2 is characterized in that: product consists of bacteriostatic agent 0.3%, EVA30%, low density polyethylene (LDPE) 59.7%, diatomite 10%.

7, air permeable anticorrosive plastic film according to claim 3 is characterized in that: product consists of bacteriostatic agent 0.5%, EVA25%, low density polyethylene (LDPE) 65%, diatomite 9.5%.

8, a kind of preparation method of air permeable anticorrosive plastic film, it is characterized in that: earlier 20～40% EVA and 0.1～1% bacteriostatic agent are mixed under 50～60 ℃ of conditions, add 50～70% polyethylene more successively, 5～10% diatomite or calcium phosphate or active carbon mix the back and extrude blown film under 120～160 ℃.