CN1587306A

CN1587306A - Foam and curtain coating forming method for environmental protection anti-fake safety biological degradation plastics

Info

Publication number: CN1587306A
Application number: CN 200410071146
Authority: CN
Inventors: 胡靖�; 冯铮
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-30
Filing date: 2004-07-30
Publication date: 2005-03-02
Anticipated expiration: 2024-07-30
Also published as: CN1297600C

Abstract

The present invention discloses the foaming and curtain coating formation process of degradable starch-chitosan-PVA plastic. The foamed material is prepared with starch, chitosan, PVA, plasticizer and foaming agent, and through mixing, and foaming inside foaming apparatus at 150-160 deg.c. The foamed material has improved water resistance and buffering performance higher than JIS2 grade, is suitable for replacing non-degradable foamed polystyrene material, and may be curtain coated or blown to form transparent, flexible and water insoluble film. It may be degraded naturally and completely. It may be used in producing packing material, and owing to its unique characteristic, it may be also used as anti-fake packing material.

Description

Foaming of environmental protection anti-fake type biological degradation plastics and flow casting molding method

Technical field

The present invention relates to have the environment protection biological degradative plastics foaming of anti-counterfeiting characteristic and the method for flow casting molding, belong to the International Classification of Patents C08J5/00 technical field that " contains the manufacturing of the goods or the formed material of polymer substance ".

Background technology

Along with people to the attention of environment protection and to eliminating the enhancing of white pollution consciousness, substitute the foam materials such as polystyrene of not degrading with the degradable environment-friendly foam material, also be in the change at quarter of the field depth aspect the environmental protection in the wrapping material field.Existing known NOVAMONT and Japanese synthetic chemical industry company have developed foaming grade METER-Bi plastics respectively, be mainly starch-PVA type, adopt extrusion moulding and injection moulding can process the bar shaped bubble and hide cushioning material, do not use chloro-fluoro-carbon kind gas and make water be whipping agent, with the PS foaming technique fundamental difference is arranged, through vibration, fall and compression testing, show that it has and polystyrene foamed EPS-50 level to 70 grade identical surge capability (being equivalent to the JIS2 level), imbed in the soil 3 months and promptly resolve into water and CO2.

Summary of the invention

Purpose of the present invention provides a kind of can the degraded fully in physical environment, to eliminating white pollution, it is significant to preserve the ecological environment, and can be used as the foaming of environmental protection anti-fake type biological degradation plastics and the flow casting molding method of anti-counterfeiting packing material.

Technical scheme of the present invention is as follows.

A kind of environmental protection anti-fake type biological degradation plastics foaming and flow casting molding method are to adopt starch one chitosan-PVA foaming, add an amount of softening agent, use water as whipping agent, foaming.Though its goods of pure starch foaming can be degraded fully, easily crisp and not water-proof shortcoming is arranged, and PVA not only has the characteristics of tackiness agent, and, can make foaming product and membrane product have the water resistance of good intensity and good toughness together with chitosan.As use the foaming moulding, the high what JIS2 of the surge capability of its foam material level, also available casting method film forming, its film in intensity between 20～30MPa, wet tenacity also between 15Mpa～20Mpa, the film tool transparency, kindliness, insoluble what water.All can degrade fully in physical environment, to eliminating white pollution, it is significant to preserve the ecological environment, and with this fill a prescription prepared film and foam material, also can be used as anti-counterfeiting packing material simultaneously.

The weight percent of prescription of the present invention and each composition is as follows:

Starch 50～75% chitosans 10～20%

PVA (1799 or 1999 type) 10～20% softening agent 5～10%

Whipping agent (water) is an amount of.

Starch used in the present invention is W-Gum, native starch or tapioca (flour);

PVA used in the present invention is 1799 types or 1999 types;

Chitosan used in the present invention is the chitin of degreasing degree 0.70～0.95;

Softening agent used in the present invention is polyvalent alcohols such as glycerine;

Whipping agent used in the present invention is a water.

Processing step method of the present invention is as follows:

(1) foam process:

Simply be expressed as: in the mould of blend-deliver to foaming machine or extrude injection moulding processing-goods

Concrete steps: earlier PVA is joined in the suitable quantity of water, and adding softening agent, add small amount of acid (as acetic acid) again, chitosan is dissolved in the what PVA solution, it is even to add the starch thorough mixing then, the metering of this compound is sent in the mould of foaming machine or and processed with the way of injection moulding, under 150～160 ℃ temperature conditions, foam, can make needed foaming product, the result shows that this based article has the surge capability (slightly high what JIS2 level) of slightly high what polystyrene foamed EPS-50 level to 70 grade, but water tolerance improves a lot than independent PVA/ starch-type foaming product.

(2) casting technique:

Simply be expressed as: blend-deliver to film forming-goods in the casting machine

Concrete steps: earlier PVA is joined in the suitable quantity of water, and add softening agent and an amount of acetic acid, make in the chitosan dissolving what PVA solution, add amidin then, be heated to 90～98 ℃, make the abundant gelatinization of starch, gelatinization thing 90～95 ℃ of drying and forming-films of what in casting machine get membrane product, experimental result shows, the dry strength of its film can reach 20～30MPa, wet tenacity also between 15～20MPa, the film tool transparency, kindliness, water insoluble.

The prepared goods of the present invention have the characteristic of complete biodegradable, with after be discarded in the soil and can degrade fully in 3 months to half a year, its degraded final product is CO2 and water.

Description of drawings

Fig. 1 is the schematic flow sheet of foam process of the present invention;

Fig. 2 is the schematic flow sheet of casting technique of the present invention.

Embodiment

Embodiment 1: take by weighing 200 parts of PVA (1799 type), it is joined contain 30 parts of glycerine, in the water that 10 parts of acetic acid is 300 parts, add 100 parts of chitosans again, add 600 parts of W-Gums then; Pinch closes evenly, this compound is sent in the mould of foaming machine, foaming is 2 minutes under the situation of 150～160 ℃ of temperature.Can make required foaming product.

Embodiment 2: take by weighing 200 parts of PVA (1799 type), it is joined contain 30 glycerine, in the water that 10 parts of acetic acid is 320 parts, add 120 parts of chitosans again, add 600 parts of tapioca (flour)s then, Qi Pinch is closed evenly, this compound metering is sent in the mould of foaming machine, foaming is 2 minutes under the situation of 150～160 ℃ of temperature, can make required foaming product.

Embodiment 3: take by weighing 150 parts of PVA (1799 type); it is joined contain 30 parts of glycerine; in the water that 10 parts of acetic acid is 320 parts, add 120 parts of chitosans again, add 650 parts of of potato starch then Qi Pinch is closed evenly; this material is sent into granulation in the tablets press, and pellet can foam by injection moulding machine, uses suitable die head; can make netted bar shaped foaming thing, with the false proof wrapping material of using of what.

Embodiment 4: take by weighing 200 parts of PVA (1799 type), it is joined contain 30 parts of glycerine, in the reactor of 1500 parts of water of 10 parts of acetic acid, add 100 parts of chitosans again, 95～98 ℃ of heating down, make among the molten what PVA of chitosan, add 300 parts the water and the mixture of 500 parts of W-Gums again, mix under 95～98 ℃, material is by being pumped into storage tank, on casting machine at 80～90 ℃ of casting film-formings, film for packaging and anti-counterfeit package film that the film that this method became can be degraded fully with what.

Claims

1, a kind of environmental protection anti-fake type biological degradation plastics foaming and flow casting molding method are the starch one chitosan-prescription of PVA type biological degradation plastics and the method for foaming and casting film-forming, and it is characterized in that: each component prescription and weight percent are as follows

Starch 50-75% chitosan 10-20%

PVA 10-20% softening agent 5-10%

Whipping agent is an amount of.

(1) employed starch is W-Gum, potato starch or tapioca (flour);

(2) employed PVA is 1799 or 1999 types;

(3) employed chitosan is that the degreasing degree is the chitin of 0.7-0.95;

(4) employed softening agent is polyvalent alcohols such as glycerine;

(5) employed whipping agent and solvent are water.

2, method according to claim 1 comprises foam process and casting technique, it is characterized in that:

The concrete steps of described foam process are:

Earlier PVA is joined in the suitable quantity of water, and adding softening agent, add small amount of acid again, as acetic acid, chitosan is dissolved in the what PVA solution, and it is even to add the starch thorough mixing then, this compound metering is sent in the mould of foaming machine or with the way of injection moulding and is processed, under 150～160 ℃ temperature conditions, foam, can make needed foaming product.

3, method according to claim 1 comprises foam process and casting film-forming technology, it is characterized in that:

The concrete steps of described casting film-forming technology are:

Earlier PVA is joined in the suitable quantity of water, and add softening agent and an amount of acetic acid, make in the chitosan dissolving what PVA solution, add amidin then, be heated to 90～98 ℃, make the abundant gelatinization of starch, gelatinization thing 90～95 ℃ of drying and forming-films of what in casting machine get membrane product.

4, prepared foam material of the inventive method and membrane product can be used what environmental protection and anti-counterfeiting packing material.