CN105001435A - Production method of environmentally-friendly biodegradable polyvinyl alcohol film - Google Patents
Production method of environmentally-friendly biodegradable polyvinyl alcohol film Download PDFInfo
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- CN105001435A CN105001435A CN201410165121.1A CN201410165121A CN105001435A CN 105001435 A CN105001435 A CN 105001435A CN 201410165121 A CN201410165121 A CN 201410165121A CN 105001435 A CN105001435 A CN 105001435A
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Abstract
The invention belongs to the field of degradable environmentally-friendly polymer material processing, and relates to a production method of an environmentally-friendly biodegradable polyvinyl alcohol film. The method comprises the following steps: mixing polyvinyl alcohol with a plasticizer, starch and water, carrying out two-step dissolving to form a solid and liquid mixture with the solid content of 15-40%, extruding through a double screw extruder to form a transparent sol, casting by using a rotary drum casting machine to obtain a polyvinyl alcohol film, drying, cooling, trimming, and rolling to form the finished polyvinyl alcohol film. The processing method of the polyvinyl alcohol film has the characteristics of continuous production, simple operation, reduction of the low energy consumption, production cycle shortening, and cost reduction.
Description
One, technical field
The present invention relates to a kind of preparation method of PVA (PVOH) FILM of environment-friendly biodegradable, belong to the manufacture field of degradable macromolecular material.
Two, background technology
As everyone knows, polyvinyl alcohol belongs to biodegradable macromolecular material, and PVA (PVOH) FILM, as a kind of emerging biodegradable environment-friendly package material, has started in developed country's widespread use such as American-European, Japanese.The maximum advantage of PVA (PVOH) FILM is that it can be dissolved in the water, nontoxic, can also be biodegradable, can not to environment; In addition, polyvinyl alcohol has good grease and gas barrier property, and can intercept most gas except water vapour and ammonia and multiple lipoid material and chemical solvents, the wrapping material therefore as goods can play excellent barrier property; Meanwhile, polyvinyl alcohol also has the advantages such as transparency is high, static electrification, impressionability be not good.Such as, so polyvinyl alcohol can be used for packing the material used in poisonous and harmful water, organic pesticide, concrete additive, chemical industry preparation etc.; May be used for packing hospitals and other places and have the article that pollutent needs to carry out high-temperature wash, packaging together can be dropped in water during use does not need to reclaim, and avoids direct contact, reduces the harm to operator yet.Therefore, the research of PVA (PVOH) FILM has caused the research interest of more and more scholar.
PVA (PVOH) FILM domestic at present mainly adopts dry method film extrusion and wet method casting film-forming two kinds.After dry method film extrusion mixes with multiple auxiliary agent by polyvinyl alcohol, adopt forcing machine to extrude curtain coating, this method can ensure production serialization, and efficiency is higher, but high to device control accuracy requirement, defect more (as produced abscess, brilliant point etc.) on obtained film appearance; Wet method casting film-forming is made into the low concentration solution of 10%-18% by polyvinyl alcohol and auxiliary agent, on steel plate or casting roller, blade coating casting film-forming is carried out by scraper, finally carry out drying and take off film, film appearance obtained by this method is good, but production process is discontinuous, preparation liquid water content is large, and required time of drying is long, thus improves production cost.PVA (PVOH) FILM preparation technology of the present invention is between dry method and wet method, the polyvinyl alcohol colloidal sol of twin-screw extrusion compounding high concentration is adopted to carry out curtain coating again, shorten the time needed for film drying widely, the object of continuous prodution can be reached, also the excellent appearance of film can be ensured, also add also biodegradable starch simultaneously, reduce the cost of film.
Three, summary of the invention
The object of the invention is to adopt polyvinyl alcohol solution to extrude casting method, be characterized in the concentration that improve polyvinyl alcohol solution, solve current wet method curtain coating PVA (PVOH) FILM production efficiency low, the problem that production energy consumption is large, realize low energy to produce efficiently, for the marketization application of environmental protection PVA (PVOH) FILM wrapping material provides technical support.
The object of the invention is to be realized by following technical measures, wherein said raw material number, except specified otherwise, is mass fraction.
PVA (PVOH) FILM provided by the invention, has following mass parts composition:
Polyvinyl alcohol: 100 parts
Softening agent: 5 ~ 50 parts
Starch: 5 ~ 40 parts
Water: 100 ~ 500 parts
The wherein said polyvinyl alcohol trade mark is 0588,1778,1788,1799,2088,2097,2099,2488, both can be wherein a kind of also can be the mixture of two or more material.
Described softening agent is generally glycerine, poly(oxyethylene glycol) 400 or both mixtures by a certain percentage.Preferably glycerine.
Described starch is W-Gum, tapioca (flour), sweet potato starch, yam starch, wheat starch etc.Preferred W-Gum.
The present invention extrudes curtain coating legal system and comprises following processing step for the technique of PVA (PVOH) FILM:
(1) according to 100 parts of polyvinyl alcohol, the water yield needed for calculating dissolving and the consumption of softening agent, add in sizeable dissolution vessel, be placed in the water-bath preheating 5-30min of 40 ~ 95 DEG C;
(2) 100 parts of polyvinyl alcohol are divided into A, B two portions, wherein the ratio of part A and water is 1: 10 ~ 1: 5, and remaining is part B;
(3) part A polyvinyl alcohol is mixed with starch, add stirring and dissolving 5 ~ 40min in preheated water and make solution transparent and homogeneous, add part B polyvinyl alcohol again and continue stirring 5 ~ 20min formation solidliquid mixture, in weighing calculation control mixture, solid content is 15% ~ 40%;
(4) solidliquid mixture of gained is added twin screw extruder to extrude.Twin screw extruder four district's temperature are respectively: 80 ~ 120 DEG C, a district, two 80 ~ 130 DEG C, districts, three 90 ~ 140 DEG C, districts, four 90 ~ 150 DEG C, districts.Screw speed is 5 ~ 50r/min;
(5) transparent and homogeneous colloidal sol forcing machine extruded casting film-forming on rotary drum casting machine.Casting machine adopts the oil bath heating of Mold Temperature Regulator, and casting roller real surface temperature controls at 30 ~ 80 DEG C, and between the casting machine edge of a knife and casting roller, to adopt feeler gauge to be adjusted to 0.1 ~ 0.5mm thick in gap, casting roller rotating speed control on-line velocity 1 ~ 8m/min;
(6) curtain coating film through super-dry, take off the process such as film, trimming, rolling after be PVA (PVOH) FILM finished product.
The present invention adopt extrude casting method form film goods have can be continuously produced, simple to operate, lower energy consumption, shorten the production cycle, the feature such as to reduce costs, fairly large continuous prodution can be realized.The PVA (PVOH) FILM obtained by the inventive method has good mechanical property, uniform film thickness and controlled, transparency is high, water soluble, oil-proofness and organic solvent-borne good, not static electrification, can be widely used in daily, agricultural, industrial chemical goods packaging, food product pack, hospital pollution thing packaging, electronic component and the packing of product etc.
Four, concrete embodiment
With embodiment, the present invention will be further described below
Embodiment 1
(1) intend dissolving 1000g polyvinyl alcohol 1788, the water needed for dissolving is 5000g, adopts softening agent glycerine 500g, water and glycerine is put into container, is placed in the water-bath preheating 10min of 70 DEG C;
(2) 1000g polyvinyl alcohol 1788 is divided into A, B two portions, wherein the ratio of part A and water is 1: 10, is 500g, and remaining 500g is part B;
(3) W-Gum 400g is selected, part A polyvinyl alcohol 500g is mixed with starch 400g, to add in preheated water solution after stirring and dissolving 40min transparent homogeneous, adding part B polyvinyl alcohol 500g continuation stirring 20min makes all solids dipping solution form solidliquid mixture, and in weighing calculation control mixture, solid content is 20%;
(4) solidliquid mixture of gained is added twin screw extruder to extrude.Twin screw extruder four district's temperature are respectively: 100 DEG C, a district, two 110 DEG C, districts, three 120 DEG C, districts, four 130 DEG C, districts.Screw speed is 40r/min;
(5) transparent and homogeneous colloidal sol forcing machine extruded casting film-forming on rotary drum casting machine.Casting roller real surface temperature controls at 60 DEG C, and between the casting machine edge of a knife and casting roller, gap adjustment is that 0.5mm is thick, and casting roller rotating speed controls on-line velocity 5m/min;
(6) curtain coating film through super-dry, take off the process such as film, trimming, rolling after be PVA (PVOH) FILM finished product.
Embodiment 2
(1) intend dissolving 1000g polyvinyl alcohol 1799, the water needed for dissolving is 4000g, and the quality adopting softening agent poly(oxyethylene glycol) 400 is 500g, water and poly(oxyethylene glycol) 400 is put into container, is placed in the water-bath preheating 8min of 80 DEG C;
(2) 1000g polyvinyl alcohol 1799 is divided into A, B two portions, wherein the ratio of part A and water is 1: 10, is 400g, and remaining 600g is part B;
(3) W-Gum 300g is selected, part A polyvinyl alcohol 400g is mixed with starch 300g, to add in preheated water solution after stirring and dissolving 30min transparent homogeneous, adding part B polyvinyl alcohol 600g continuation stirring 15min makes all solids dipping solution form solidliquid mixture, and in weighing calculation control mixture, solid content is 25%;
(4) solidliquid mixture of gained is added twin screw extruder to extrude.Twin screw extruder four district's temperature are respectively: 110 DEG C, a district, two 120 DEG C, districts, three 130 DEG C, districts, four 140 DEG C, districts.Screw speed is 40r/min;
(5) transparent and homogeneous colloidal sol forcing machine extruded casting film-forming on rotary drum casting machine.Casting roller real surface temperature controls at 60 DEG C, and between the casting machine edge of a knife and casting roller, gap adjustment is that 0.5mm is thick, and casting roller rotating speed controls on-line velocity 5m/min;
(6) curtain coating film through super-dry, take off the process such as film, trimming, rolling after be PVA (PVOH) FILM finished product.
Example 3
(1) intend dissolving 1000g polyvinyl alcohol 2097, the water needed for dissolving is 3500g, adopts softening agent qualities of glycerin to be 300g, water and glycerine is put into container, is placed in the water-bath preheating 5min of 95 DEG C;
(2) 1000g polyvinyl alcohol 2097 is divided into A, B two portions, wherein the ratio of part A and water is 1: 7, is 500g, and remaining 500g is part B;
(3) tapioca (flour) 200g is selected, part A polyvinyl alcohol 500g is mixed with starch 200g, to add in preheated water solution after stirring and dissolving 20min transparent homogeneous, adding part B polyvinyl alcohol 500g continuation stirring 5min makes all solids dipping solution form solidliquid mixture, and in weighing calculation control mixture, solid content is 30%;
(4) solidliquid mixture of gained is added twin screw extruder to extrude.Twin screw extruder four district's temperature are respectively: 80 DEG C, a district, two 85 DEG C, districts, three 95 DEG C, districts, four 100 DEG C, districts.Screw speed is 30r/min;
(5) transparent and homogeneous colloidal sol forcing machine extruded casting film-forming on rotary drum casting machine.Casting roller real surface temperature controls at 60 DEG C, and between the casting machine edge of a knife and casting roller, gap adjustment is that 0.5mm is thick, and casting roller rotating speed controls on-line velocity 5m/min;
(6) curtain coating film through super-dry, take off the process such as film, trimming, rolling after be PVA (PVOH) FILM finished product.
Claims (5)
1. the preparation method of the PVA (PVOH) FILM of environment-friendly biodegradable refer to by polyvinyl alcohol, starch, softening agent, water is blended make colloidal sol after to be extruded into the technique of casting film-forming on rotary drum casting machine through twin screw extruder, its feature comprises following technique: (1) stirs into solidliquid mixture after polyvinyl alcohol, starch, softening agent and water being mixed at a certain temperature; (2) solidliquid mixture is added in twin screw extruder be extruded into transparent and homogeneous colloidal sol; (3) by colloidal sol casting film-forming on rotary drum casting machine; (4) PVA (PVOH) FILM finished product can be obtained through super-dry, cooling, cutting edge, rolling.
2. the preparation method of the PVA (PVOH) FILM of a kind of environment-friendly biodegradable according to claim 1, is characterized in that: raw materials by weight portion meter used comprises following component: polyvinyl alcohol 100 parts; 5 ~ 50 parts, softening agent; Starch 5 ~ 40 parts; 100 ~ 500 parts, water.
3. the preparation method of the PVA (PVOH) FILM of a kind of environment-friendly biodegradable according to claim 1, it is characterized in that: the described polyvinyl alcohol trade mark is 0588,1778,1788,1799,2088,2097,2099,2488, both can be wherein a kind of also can be the mixture of two or more material.
4. the preparation method of the PVA (PVOH) FILM of a kind of environment-friendly biodegradable according to claim 1, is characterized in that: described softening agent is glycerine, poly(oxyethylene glycol) 400, or both coordinate rear use by a certain percentage.
5. a kind of gel extrusion according to claim 1 prepares the technique of edible film, it is characterized in that: the solidliquid mixture solid content after dissolving controls 15% ~ 40%, is extruded into after transparent and homogeneous colloidal sol carries out casting film-forming again through forcing machine.
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| CN201410165121.1A CN105001435A (en) | 2014-04-22 | 2014-04-22 | Production method of environmentally-friendly biodegradable polyvinyl alcohol film |
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| CN201410165121.1A CN105001435A (en) | 2014-04-22 | 2014-04-22 | Production method of environmentally-friendly biodegradable polyvinyl alcohol film |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105418949A (en) * | 2016-01-11 | 2016-03-23 | 云南云天化股份有限公司 | Preparing method for polyvinyl alcohol film |
| CN106867035A (en) * | 2016-12-30 | 2017-06-20 | 苏州泰如新材料科技有限公司 | A kind of modified polyvinylalcohol packing film and preparation method thereof |
| CN107254130A (en) * | 2017-07-03 | 2017-10-17 | 界首市菁华科技信息咨询服务有限公司 | A kind of degradable agricultural film |
| CN107286543A (en) * | 2017-05-27 | 2017-10-24 | 中国石油化工集团公司 | A kind of polyvinyl alcohol optical film and preparation method thereof |
| CN107383726A (en) * | 2017-08-01 | 2017-11-24 | 成都博美实润科技有限公司 | A kind of preparation method of degradable green resin |
| CN107459752A (en) * | 2017-10-11 | 2017-12-12 | 广东省生物工程研究所（广州甘蔗糖业研究所） | A kind of environment-friendly water-soluble polyvinyl alcohol packing film and preparation method thereof |
| CN107722372A (en) * | 2017-10-18 | 2018-02-23 | 湖州新驰医药科技有限公司 | It is a kind of can self-dissolving inner bag powder of edible fungus production method |
| CN107936430A (en) * | 2016-10-13 | 2018-04-20 | 中国石油化工股份有限公司 | High fluidity polyvinyl alcohol that thermoplastification is modified, cast film materials and preparation method thereof |
| CN108774373A (en) * | 2018-06-25 | 2018-11-09 | 安徽鼎正包装材料有限公司 | A kind of express delivery packaging film of PVA bases controlled degradation and Fertilizer Transformed |
| CN108929508A (en) * | 2018-06-25 | 2018-12-04 | 安徽鼎正包装材料有限公司 | A kind of PVA base degrades and uses farm-oriented mulch under controllable canopy |
| CN108997686A (en) * | 2018-06-25 | 2018-12-14 | 安徽鼎正包装材料有限公司 | A kind of PVA base awning film that can be degraded at any time |
| CN110564012A (en) * | 2019-08-02 | 2019-12-13 | 安徽国风塑业股份有限公司 | Water-soluble biaxially oriented polyvinyl alcohol film and preparation method thereof |
| CN115073821A (en) * | 2022-07-15 | 2022-09-20 | 大家智合(北京)网络科技股份有限公司 | Polyvinyl alcohol modified starch film and preparation method and application thereof |
| WO2023077645A1 (en) * | 2021-11-04 | 2023-05-11 | 和碳新材科技(南京)有限公司 | Oil-water separation device and oil-water separation method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105418949B (en) * | 2016-01-11 | 2018-04-03 | 云南云天化股份有限公司 | A kind of preparation method of polyvinyl alcohol film |
| CN105418949A (en) * | 2016-01-11 | 2016-03-23 | 云南云天化股份有限公司 | Preparing method for polyvinyl alcohol film |
| CN107936430A (en) * | 2016-10-13 | 2018-04-20 | 中国石油化工股份有限公司 | High fluidity polyvinyl alcohol that thermoplastification is modified, cast film materials and preparation method thereof |
| CN106867035A (en) * | 2016-12-30 | 2017-06-20 | 苏州泰如新材料科技有限公司 | A kind of modified polyvinylalcohol packing film and preparation method thereof |
| CN107286543A (en) * | 2017-05-27 | 2017-10-24 | 中国石油化工集团公司 | A kind of polyvinyl alcohol optical film and preparation method thereof |
| CN107286543B (en) * | 2017-05-27 | 2021-03-19 | 中国石油化工集团公司 | Polyvinyl alcohol optical film and preparation method thereof |
| CN107254130A (en) * | 2017-07-03 | 2017-10-17 | 界首市菁华科技信息咨询服务有限公司 | A kind of degradable agricultural film |
| CN107383726A (en) * | 2017-08-01 | 2017-11-24 | 成都博美实润科技有限公司 | A kind of preparation method of degradable green resin |
| CN107459752A (en) * | 2017-10-11 | 2017-12-12 | 广东省生物工程研究所（广州甘蔗糖业研究所） | A kind of environment-friendly water-soluble polyvinyl alcohol packing film and preparation method thereof |
| CN107722372A (en) * | 2017-10-18 | 2018-02-23 | 湖州新驰医药科技有限公司 | It is a kind of can self-dissolving inner bag powder of edible fungus production method |
| CN108774373A (en) * | 2018-06-25 | 2018-11-09 | 安徽鼎正包装材料有限公司 | A kind of express delivery packaging film of PVA bases controlled degradation and Fertilizer Transformed |
| CN108929508A (en) * | 2018-06-25 | 2018-12-04 | 安徽鼎正包装材料有限公司 | A kind of PVA base degrades and uses farm-oriented mulch under controllable canopy |
| CN108997686A (en) * | 2018-06-25 | 2018-12-14 | 安徽鼎正包装材料有限公司 | A kind of PVA base awning film that can be degraded at any time |
| CN110564012A (en) * | 2019-08-02 | 2019-12-13 | 安徽国风塑业股份有限公司 | Water-soluble biaxially oriented polyvinyl alcohol film and preparation method thereof |
| WO2023077645A1 (en) * | 2021-11-04 | 2023-05-11 | 和碳新材科技(南京)有限公司 | Oil-water separation device and oil-water separation method |
| CN115073821A (en) * | 2022-07-15 | 2022-09-20 | 大家智合(北京)网络科技股份有限公司 | Polyvinyl alcohol modified starch film and preparation method and application thereof |
| CN115073821B (en) * | 2022-07-15 | 2023-08-11 | 大家智合(北京)网络科技股份有限公司 | Polyvinyl alcohol modified starch film and preparation method and application thereof |
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