Summary of the invention
The purpose of this invention is to provide a kind of composition of degrading plant starch foaming wrapping material fully that is used to produce.Composition of the present invention comprises:
(A) plant amylum of 70-90% and/or plant powder;
(B) 5-15% vegetable fibre;
(C) 0.5-1% whipping agent;
(D) auxiliary agent of 4.5-15%.
Described % all is base with the composition total weight.
Described starch is selected from general industry starch, as W-Gum, yam starch, sweet potato starch, tapioca (flour) etc. and their modifier, and as Sumstar 190, cationic starch, cross-linking starch, starch ester etc., and these two or more binding substances.Described plant powder is that plant seed, stem tuber, root or leaf are directly pulverized the powder that forms, as wheat-flour, Semen Maydis powder, rice meal, sticky rice flour, potato powder, sweet potato flour, Tapioca Starch etc., the perhaps binding substances of these two or more.
Described vegetable fibre is selected from xylon, cotton fibre, straw fiber, reed fiber, crop branch fiber, waste paper pulp and their modifier, as carboxymethyl cellulose, carboxyethyl cellulose, cellulose ester or ether of cellulose etc., and two or more binding substances in them.
Described whipping agent can be a pneumatogen, as lower boiling aliphatic hydrocarbon, alcohol, ether, halohydrocarbon or water etc.Also can be chemical foaming agent, as Cellmic C 121, azo two carbonic acid diisopropyl esters, sodium bicarbonate, volatile salt etc., perhaps these binding substances.
Described auxiliary agent comprises: strengthening agent, as glass fibre, asbestos powder, Paris white, wollastonite powder etc.; Tackifier are as polyvinyl formal, gelatin, polyacrylic acid emulsion, Sorbic Acid, glycerine, polyvinyl alcohol etc.; Releasing agent is as silicone oil, solid paraffin, polyethylene wax, stearic acid, whiteruss etc.; Also can be according to the optional a spot of insect-proof agent that adds of different application needs, sanitas, non-blushing thinner etc.Various auxiliary agents use with the conventional amount used in this area, and this is to determine easily to one skilled in the art.
Foam package material involved in the present invention does not conform to any resin, wherein all natural polymer starch and Mierocrystalline cellulose renewable and that can be decomposed by Institute of Micro-biology more than the 90-95%, the remaining various auxiliary agents of 5-10% also all belong to degradable components, so the prepared foam package material of this invention is the Wholly-degradable material.
Treated starch or modified-cellulose are compared with common starch or Mierocrystalline cellulose, and its chemistry is significantly improved with physicals, can increase the strength of materials, improves the material frothing percentage, but does not influence biological degradability, so treated starch and modified-cellulose are preferred.
Starch or plant powder itself is as foam material body material of the present invention, and its mechanical property does not reach application requiring far away, except that improving the intensity by its modification, adds various auxiliary agents and is absolutely necessary.The selection of various auxiliary agents also must have consistency preferably with body material except that consideration self degradation property.In order to improve consistency, also should contain the compatibilization component in the auxiliary agent.
The processing units that the present invention prepares the foam package material employing of can degrading fully is common mixing equipment, single screw extrusion machine and heating and mould pressing molding device.Facility investment is few, and technology is simple, non-environmental-pollution.
The method for preparing foam package material of the present invention comprises with water being medium, after the auxiliary agent of the plant amylum of 70-90% or plant powder, 5-15% vegetable fibre, 0.5-1% whipping agent and 5-15% mixed, use various forming methods, for example single screw extrusion machine or hot compression molding machine moulding process are prepared from.This material is white in color or oyster white, and density is 0.1-0.05g/cm
3, can satisfy the requirement of packing use properties.
For example processing and forming technology can carry out like this, by a certain percentage all raw materials are mixed with water, thorough mixing is even in homogenizer, make the big material of dough shape, then big material is transported in the single screw extrusion machine, extrusion temperature is 180-190 ℃, extrusion moulding or join in the heat pressing forming machines according to the certain big material of the big young pathbreaker of mould, temperature is 180-200 ℃, and pressure is 0.1-0.5Mpa, clamp time 50-60S compression moulding.
The present invention's foam package material of can degrading fully, mainly as Shockproof packaging, sound insulation, lagging material, reclaim and also can be used as animal-feed or fermentative production industrial spirit, hydrolysis production glucose except that can degrading fully with the back.
Below in conjunction with embodiment the present invention is described, it should be understood that these embodiment only are used for illustrative purposes, do not constitute any limitation of the invention.
Embodiment 1:
Get 780g W-Gum, 100g cationic starch, 80g carboxymethyl cellulose, contain the 20g polyvinyl formal 100g aqueous solution, 5gNaHCO
3, 10g 100 order asbestos powders, 5g whiteruss, 300g water add height and stir in the machine, stir with the 200r/min rotating speed, promptly get big material behind the 10min.
Above-mentioned big material is joined in the single screw extrusion machine, under 180-190 ℃, extrusion moulding, promptly getting definite shape oyster white density is 0.19g/cm
3The foam package material of can degrading fully.
Embodiment 2:
With the 80g carboxymethyl cellulose among the embodiment 1 with contain the 20g polyvinyl formal 100g aqueous solution, replace with the 100g wood cellulose, amount of water 300g changes 400g into, and other component and fabrication process condition are constant, and can make density is 0.12g/cm
3The oyster white foam package material of can degrading fully.
Embodiment 3:
780g W-Gum among the embodiment 1 is replaced with the 780g yam starch, and the 100g cationic starch replaces with the 100g cross-linking starch, and other component and fabrication process condition are constant, and can make density is 0.1g/cm
3The oyster white foam package material of can degrading fully.
Embodiment 4:
With the 5g NaHCO among the embodiment 1
3Replace with the 5g Cellmic C 121, the 20g polyvinyl formal 100g aqueous solution replaces with the 20g gelatin 100g aqueous solution, and other component and fabrication process condition are constant, and just can make density is 0.05g/cm
3The oyster white foam package material of can degrading fully.
Embodiment 5:
Get the 700g wheat-flour, the 100g straw fiber, the 100g cross-linking starch, the 10g volatile salt, the 80g Sorbic Acid, 10g solid paraffin, 400g water add height and stir in the machine, promptly to get big material behind the 200r/min rotating speed stirring 15min.
Get a certain amount of big material, join in the heat pressing forming machines mould, under 185 ℃, pressure 0.2MP, compacting 55S, just can get the faint yellow density of definite shape is 0.1g/cm
3The foam package material of can degrading fully.
Embodiment 6:
Get the 750g W-Gum, 100g600 order CaCO
3, the 85g waste paper pulp, the 10g stearic acid, 5g azo two carbonic acid diisopropyl esters, 500g is dissolved with the 50g polyvinyl alcohol water solution, joins height and stirs in the machine, with the 200r/min rotating speed, promptly gets big material behind the stirring 15min.
Get a certain amount of big material, join in the heat pressing forming machines mould, under 195 ℃, pressure 0.1MP, compacting 60S, just can get definite shape white density is 0.1g/cm
3The foam package material of can degrading fully.