CN104497457A - Water-soluble plastic thin film and preparation method thereof - Google Patents

Abstract

The invention relates to a water-soluble plastic thin film, which is prepared from the following raw materials in parts by weight: 15-25 parts of polyvinyl alcohol, 1.5-3 parts of plasticizer, 1.5-5.5 parts of lubricant, 0.5-1.5 parts of levelling agent, 4-6 parts of deemulsifier, 0.5-1.5 parts of antioxidant, 0.2-0.6 part of coloring agent, 2-6 parts of degradation auxiliary and 100 parts of water. The water-soluble plastic thin film is non-toxic and tasteless, and can be resolved intra-abdominally and expelled out of the body along with faeces even after being eaten by people or livestock by mistake, without any adverse effect. The thin film has good mechanical performance, and high tensile strength and elongation at break; the water-soluble property is excellent, and the dissolving speed is fast; the raw materials are cheap, the preparation cost is low, and the preparation technology is simple and easy to operate, the water-soluble plastic thin film has high practical value, not only can be used for export package of agricultural mulching films, industrial and agricultural products, but also can be used for package of food, medicines and special products, as well as daily life, shopping, fruit preservation and the like.

Description

A kind of water-soluble plastic thin film and preparation method thereof

Technical field

The present invention relates to a kind of plastics film and preparation method thereof, specifically, relate to a kind of water-soluble plastic thin film and preparation method thereof.

Background technology

Plastics film is widely used in multiple fields that people produce, live, and while bringing convenient and material benefit, the difficult degradation of plastics film also causes severe contamination to the environment that the mankind depend on for existence.For eliminating the white pollution grown with each passing day, the degradable films such as various photodegradation, biological degradation, photo bio two degraded, water-soluble plastic thin films arises at the historic moment.Wherein water-soluble plastic thin film has the degraded feature such as thorough, of many uses, safe and convenient to use with it and becomes the first-selection of environment-friendly type plastic film.The water-soluble plastic thin film product of current Application and Development, price is generally higher, and the over-all properties such as solubization, physics, mechanics, technique of product need further raising.The performance of water-soluble film is by the result of its each component comprehensive action, therefore how to select suitable auxiliary agent, optimizing materials proportioning thus reduce product cost, improve the focus that the over-all properties of film becomes research at present.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of water-soluble plastic thin film and preparation method thereof, has the features such as mechanical property is good, dissolution rate is fast, preparation technology is simple, product cost is low.

Technical scheme of the present invention is as follows:

A kind of water-soluble plastic thin film, be made up of the raw material of following portions by weight:

Polyvinyl alcohol 15 ~ 25 parts,

1.5 ~ 3 parts, softening agent,

Lubricant 1.5 ~ 5.5 parts,

Flow agent 0.5 ~ 1.5 part,

Emulsion splitter 4 ~ 6 parts,

Antioxidant 0.5 ~ 1.5 part,

Tinting material 0.2 ~ 0.6 part,

Prodegradant 2 ~ 6 parts,

100 parts, water;

Described polyvinyl alcohol is complete alcoholysis type polyvinyl alcohol or partial alcoholysis type polyvinyl alcohol;

Described softening agent is butyl stearate, polyoxyethylene glycol or their arbitrary combination;

Described lubricant is ethylene glycol, glycerol, maltose alcohol or their arbitrary combination;

Described flow agent is gelatin, gelatine, water-based flow agent or their arbitrary combination;

Described emulsion splitter is industrial alcohol, propanediol polyoxypropylene Soxylat A 25-7 or their arbitrary combination;

Described antioxidant is xitix, sodium ascorbate, tea-polyphenol or their arbitrary combination;

Described tinting material is titanium dioxide, white dyes or their arbitrary combination;

Described prodegradant is Natvosol, hydroxypropylcellulose, yellow starch gum, white dextrin or their arbitrary combination.

Described complete alcoholysis type polyvinyl alcohol can be PVA 24-88.

Described partial alcoholysis type polyvinyl alcohol can be PVA 26-99.

The invention also discloses the preparation method of described water-soluble plastic thin film, comprise the following steps:

(1) add in normal-pressure reaction kettle by the pure water measured, start agitator, slowly added in reactor by the polyvinyl alcohol weighed up, while reinforced, intensification limit, limit is stirred;

(2) after stirring 5 ~ 10min, add emulsion splitter, and then add softening agent;

(3) add in reactor after lubricant, flow agent, antioxidant, tinting material, prodegradant being mixed in proportion, control temperature of reaction kettle at 90 ~ 110 DEG C, stir 30 ~ 40min;

(4) the solution liquid stock pump made is squeezed in the hold tank of 70 ~ 80 DEG C, leave standstill froth breaking 20 ~ 30min;

(5) utilized by gained sizing material coating machine to spray masking, spraying temperature is 70 ~ 80 DEG C.

The number of times of described stirring can be 60 ~ 90 revs/min, and the speed of intensification can be 2 ~ 3 DEG C/min.

Beneficial effect of the present invention

Water-soluble plastic thin film of the present invention, nonpoisonous and tasteless, even if eaten by mistake by people or livestock, also can dissolve in abdomen, excrete with ight soil, without any bad reflection.The mechanical property of film is good, has high tensile strength and elongation at break; Water soluble characteristic is excellent, and dissolution rate is fast; And its low in raw material price, preparation cost is low, and preparation technology is simple to operation, has higher practical value, not only can be used for agricultural mulching, industrial and agricultural products standard export packages, also can be used for food, medicine, the packaging of Special Products and daily life, shopping, fruit freshness preserving etc.

Embodiment

Embodiment 1

Press column weight amount and take each raw material:

PVA 24-88 15kg、

Butyl stearate 1.5kg,

Ethylene glycol 1.5kg,

Gelatin 0.5kg,

Industrial alcohol 4kg,

Xitix 0.5kg,

Titanium dioxide 0.2kg,

Yellow starch gum 2kg,

Water 100kg.

First add in normal-pressure reaction kettle by 100kg pure water, open agitator, then slowly added in reactor by 10kg PVAC polyvinylalcohol 24-88, reinforced intensification limit, limit is simultaneously stirred, and stirs number of times 80 revs/min, the speed 2 DEG C/min of intensification; After stirring 10min, add industrial alcohol 3kg, and then add butyl stearate 1kg; Then add in reactor by ethylene glycol 1kg, gelatin 0.5kg, xitix 0.3kg, titanium dioxide 0.1kg, yellow starch gum 2kg after being mixed, temperature of reaction kettle controls at 100 DEG C, stirs 40min; The solution liquid stock pump made is squeezed in the hold tank of 80 DEG C, leaves standstill froth breaking 30min; Utilized by gained sizing material coating machine to be coated with and make plastics film, coating temperature controls at 80 DEG C.

The plastics film obtained by the present embodiment is checked through national plastic products quality Supervision Test Center, mean thickness is 0.037mm, tensile strength is longitudinal 37.8MPa, horizontal 39.5MPa, elongation at break is longitudinal 290%, laterally 285%, it is 10 that shock strength detects the sample number that do not rupture, degradation property is for dissolve completely, and its technical indicator all meets the technical requirements of category-A premium grads in technical indicator Q/XPS 01-2006.Wherein carrying out degradation property test method to sample is: the 0.2g that materialses is placed in iodine flask, adds 50mL distilled water, is heated to seethe with excitement and keeps 5min, then leaves standstill 5min, observes dissolved state.

Embodiment 2

Press column weight amount and take each raw material:

PVA 26-99 25kg、

Polyoxyethylene glycol 3kg,

Maltose alcohol 5.5kg,

Gelatine 1.5kg,

Industrial alcohol 4kg,

Tea-polyphenol 1.5kg,

White dyes 0.6kg,

White dextrin 6kg,

Water 100kg.

First add in normal-pressure reaction kettle by 100kg pure water, open agitator, then slowly added in reactor by 20kg PVA 26-99, reinforced intensification limit, limit is simultaneously stirred, and stirs number of times 80 revs/min, the speed 2 DEG C/min of intensification; After stirring 10min, add industrial alcohol 6kg, and then add polyoxyethylene glycol 3.5kg; Then add in reactor by maltose alcohol 5kg, gelatine 1kg, tea-polyphenol 1kg, white dyes 0.5kg, white dextrin 6kg after being mixed, temperature of reaction kettle controls at 100 DEG C, stirs 40min; The solution liquid stock pump made is squeezed in the hold tank of 80 DEG C, leaves standstill froth breaking 30min; Utilized by gained sizing material coating machine to spray and make plastics film, spraying temperature controls at 80 DEG C.

The plastics film obtained by the present embodiment is checked through national plastic products quality Supervision Test Center, mean thickness is 0.025mm, tensile strength is longitudinal 25.6MPa, horizontal 23.8MPa, elongation at break is longitudinal 193%, laterally 140%, degradation property is for dissolve completely, and its technical indicator all meets the technical requirements that technology refers to category-B premium grads in Q/XPS 01-2006.Wherein carrying out degradation property test method to sample is: the 0.2g that materialses is placed in iodine flask, adds 25 DEG C of distilled water 50mL, concuss 1min, leaves standstill 5min, observes dissolved state.Practice shows, the plastics film obtained by the present embodiment, and when weather spots, as long as through the several seconds, product just can whole water-soluble degraded; Toss rubbish and any field is met water and also all can be degraded within a couple of days and dissolve, noresidue.

Embodiment 3

Press column weight amount and take each raw material:

PVA 24-88 15kg、

Butyl stearate 2.25kg,

Ethylene glycol 3kg,

Gelatin 0.75kg,

Industrial alcohol 4kg,

Xitix 0.65kg,

Titanium dioxide 0.3kg,

Yellow starch gum 4kg,

Water 100kg.

First add in normal-pressure reaction kettle by 100kg pure water, open agitator, then slowly added in reactor by 15kg PVAC polyvinylalcohol 24-88, reinforced intensification limit, limit is simultaneously stirred, and stirs number of times 80 revs/min, the speed 2 DEG C/min of intensification; After stirring 10min, add industrial alcohol 4kg, and then add butyl stearate 2.25kg; Then add in reactor by ethylene glycol 3kg, gelatin 0.75kg, xitix 0.65kg, titanium dioxide 0.3kg, yellow starch gum 4kg after being mixed, temperature of reaction kettle controls at 100 DEG C, stirs 40min; The solution liquid stock pump made is squeezed in the hold tank of 80 DEG C, leaves standstill froth breaking 30min; Utilized by gained sizing material coating machine to be coated with and make plastics film, coating temperature controls at 80 DEG C.

The plastics film obtained by the present embodiment is checked through national plastic products quality Supervision Test Center, mean thickness is 0.045mm, tensile strength is longitudinal 45.8MPa, horizontal 48.5MPa, elongation at break is longitudinal 390%, laterally 385%, it is 10 that shock strength detects the sample number that do not rupture, degradation property is for dissolve completely, and its technical indicator all meets the technical requirements of category-A premium grads in technical indicator Q/XPS 01-2006.Wherein carrying out degradation property test method to sample is: the 0.2g that materialses is placed in iodine flask, adds 50mL distilled water, is heated to seethe with excitement and keeps 5min, then leaves standstill 5min, observes dissolved state.

Claims (7)

1. a water-soluble plastic thin film, is characterized in that: be made up of the raw material of following portions by weight:

Polyvinyl alcohol 15 ~ 25 parts,

1.5 ~ 3 parts, softening agent,

Lubricant 1.5 ~ 5.5 parts,

Flow agent 0.5 ~ 1.5 part,

Emulsion splitter 4 ~ 6 parts,

Antioxidant 0.5 ~ 1.5 part,

Tinting material 0.2 ~ 0.6 part,

Prodegradant 2 ~ 6 parts,

100 parts, water.

2. a kind of water-soluble plastic thin film according to claim 1, is characterized in that: described polyvinyl alcohol is complete alcoholysis type polyvinyl alcohol or partial alcoholysis type polyvinyl alcohol.

3. a kind of water-soluble plastic thin film according to claim 1, is characterized in that: described softening agent is butyl stearate, polyoxyethylene glycol or their arbitrary combination.

4. a kind of water-soluble plastic thin film according to claim 1, is characterized in that: described lubricant is ethylene glycol, glycerol, maltose alcohol or their arbitrary combination.

5. a kind of water-soluble plastic thin film according to claim 1, is characterized in that: described flow agent is gelatin, gelatine, water-based flow agent or their arbitrary combination.

6. a preparation method for water-soluble plastic thin film, is characterized in that: comprise the following steps:

(1) add in normal-pressure reaction kettle by the pure water measured, start agitator, slowly added in reactor by the polyvinyl alcohol weighed up, while reinforced, intensification limit, limit is stirred;

(2) after stirring 5 ~ 10min, add emulsion splitter, and then add softening agent;

(3) add in reactor after lubricant, flow agent, antioxidant, tinting material, prodegradant being mixed in proportion, control temperature of reaction kettle at 90 ~ 110 DEG C, stir 30 ~ 40min;

(4) the solution liquid stock pump made is squeezed in the hold tank of 70 ~ 80 DEG C, leave standstill froth breaking 20 ~ 30min;

(5) utilized by gained sizing material coating machine to spray masking, spraying temperature is 70 ~ 80 DEG C.

7. a kind of water-soluble plastic thin film according to claim 6, is characterized in that: the number of times of described stirring can be 60 ~ 90 revs/min, and the speed of intensification can be 2 ~ 3 DEG C/min.