CN101722274B - Three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof - Google Patents
Three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof Download PDFInfo
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- CN101722274B CN101722274B CN2009102732198A CN200910273219A CN101722274B CN 101722274 B CN101722274 B CN 101722274B CN 2009102732198 A CN2009102732198 A CN 2009102732198A CN 200910273219 A CN200910273219 A CN 200910273219A CN 101722274 B CN101722274 B CN 101722274B
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- acetate copolymer
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- density polyethylene
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Abstract
The invention relates to a three-layer ethylene-vinyl acetate copolymer negative pressure casting film and a preparation method thereof. The raw material comprises the following components by weight percent: 79.8 to 89.8 percent of ethylene-vinyl acetate copolymer, 10 to 20 percent of the molecular weight of low-density polyethylene and 0.1 to 0.2 percent of oleamide. The preparation method comprises the following steps: placing the three ingredients into three blenders at an upper layer, an intermediate layer and a lower layer, adding half of the low-density polyethylene, half of the oleamide and 5 to 10 percent of the ethylene-vinyl acetate copolymer into the blenders respectively for the upper-layer ingredient and the lower-layer ingredient, adding the left ethylene-vinyl acetate copolymer into the blender for the intermediate-layer ingredient, thoroughly stirring, and absorbing all the ingredients by an absorption machine to feed openings of extrusion machines. The three extrusion machines move in the same direction, gather on an upper end of a die head in three different flow channels to form a three-layer affinity integral liquefied body, and the three-layer ethylene-vinyl acetate copolymer negative pressure casting film is obtained through inflation, shaping, cooling and modeling. The film prepared by the method not only meets the requirements of extensibility of films for V-casting but also ensures non-adhesion between the film and moulds.
Description
Technical field
The present invention relates to a kind of three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof.
Background technology
The moulding of V method claims the negative pressure of vacuum moulding again, and vacuum sealed molding is the physics formative method that a kind of novel environment friendly dry sand solidifies.This technology is having overlay film moulding on the wooden model of passage and air extractor with plastic sheeting through heating, after placing sandbox, insert thin dry sand and make molding sand, vibration ramming also is covered with notacoria, rely on gas in the vavuum pump extraction type, cause sand mold inner chamber vacuum, make sand mold inner chamber and atmospheric pressure form pressure reduction, make dry sand obtain solidifying without any need for binding agent.Form required die cavity.
Because this film will overlay on the wooden model with the cast product identical appearance, mould impression is vacuumized and extends fully be attached to the wooden model surface, therefore, need film that the favorable extensibility energy is arranged, again resilience can not be arranged after the moulding, and change the physical dimension of die cavity.Especially to those complex contours, as porous, dark recessed foundry goods is arranged, require the film molding easy again simultaneously, do not take place sticking glutinous with wooden model.This Study on Technology and applicability are promoted ripe, use at home and develop for V method casting technique and expanded the space.
Ethylene-vinyl acetate copolymer (EVA), adopt ethylene-vinyl acetate copolymer (EVA) to become the industry common recognition as the casting of V method with film, because acetic acid content is high more in the EVA raw material, the tensile property of film is good more, but simultaneously also easy more sticking glutinous, cracky gas leakage destroys the moulding of vacuum.How to make not resilience and sticking glutinous functional requirement after open and flat extensibility of film and the moulding reach the optimum efficiency that moulding is used simultaneously, need find out a new preparation approach.
Summary of the invention
Purpose of the present invention provides a kind of three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof, three layers of compound negative pressure casting film of the ethylene-vinyl acetate copolymer that the present invention produces existing favorable extensibility when being warmed to 60 ℃, resilience is not glued stickiness again.
Purpose of the present invention can realize by following technical proposals:
Ethylene-vinyl acetate copolymer negative pressure casting film, composed of the following components, each components based on weight percentage, it is characterized in that: the ethylene-vinyl acetate copolymer molecular weight is at 2～500,000 consumption 79.8-89.8%, the low density polyethylene (LDPE) molecular weight is 200,000 consumption 10-20%, oleamide 0.1-0.2%, press above-mentioned three kinds of materials last, in, lower floor's materials add three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds low density polyethylene (LDPE) respectively in the body, the ethylene-vinyl acetate copolymer of oleamide and 5-10%, the low density polyethylene (LDPE) addition is half of low density polyethylene (LDPE) total amount, the oleamide addition is half of oleamide total amount, remaining ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of ethylene-vinyl acetate copolymer.
The preparation method of ethylene-vinyl acetate copolymer negative pressure casting film, it is characterized in that: carry out according to the following steps: with 79.8-89.8% ethylene-vinyl acetate copolymer molecular weight is 2～500,000,10-20% low density polyethylene (LDPE) molecular weight is 200,000, three kinds of materials of 0.1-0.2% oleamide are by last, in, lower floor's materials join three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds low density polyethylene (LDPE) respectively in the body, the ethylene-vinyl acetate copolymer of oleamide and 5-10%, the low density polyethylene (LDPE) addition is half of low density polyethylene (LDPE) total amount, the oleamide addition is half of oleamide total amount, remaining ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of acetate ethylene copolymer.
Equipment used in the present invention is existing ripe equipment.
The present invention searches out the low density polyethylene (LDPE) affine with EVA, oleamide, and does not influence the chemistry of EVA and the material of physical property, and this material has lubrication, can be attached to the eva film surface after heating is merged, and forms thin layer, makes eva film not sticking glutinous.
The present invention designs three-layer co-extruded inflation film, feasible three layers of EVA negative pressure casting film producing, and the intermediate portion is pure EVA raw material, inside and outside both sides then are the mixing EVA that is added with the lubriation material of low density polyethylene (LDPE), oleamide.
The present invention compared with prior art has following remarkable advantage:
Traditional E VA cast film is the single thin film that the pure tube heating of employing blow extrusion is shaped, so the common existence of single thin film is easily sticking glutinous, has caused the defective of type breakage.The present invention adopts the method for three-layer co-extruded blow molding to solve this contradiction, and the eva film of producing can satisfy the extension property requirement of V method casting with film, can guarantee all not sticking glutinous problem between film and the model again.
The specific embodiment
Embodiment 1
With 60Kg ethylene-vinyl acetate copolymer molecular weight is 2～500,000,13Kg low density polyethylene (LDPE) molecular weight is 200,000, three kinds of materials of 60g oleamide are by last, in, lower floor's materials add three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds the 6.5Kg low density polyethylene (LDPE) respectively in the body, the ethylene-vinyl acetate copolymer of 30g oleamide and 5Kg, remaining 50Kg ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of ethylene-vinyl acetate copolymer.
Embodiment 2
With 80Kg acetate ethylene copolymer molecular weight is 2～500,000,10Kg low density polyethylene (LDPE) molecular weight is 200,000, three kinds of materials of 50g oleamide are by last, in, lower floor's materials add three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds the 5Kg low density polyethylene (LDPE) respectively in the body, the acetate ethylene copolymer of 25g oleamide and 5Kg, remaining 70Kg ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of ethylene-vinyl acetate copolymer.
Embodiment 3
With 70Kg ethylene-vinyl acetate copolymer molecular weight is 2～500,000,15Kg low density polyethylene (LDPE) molecular weight is 200,000, three kinds of materials of 15g oleamide are by last, in, lower floor's materials add three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds the 7.5Kg low density polyethylene (LDPE) respectively in the body, 7.5g the ethylene-vinyl acetate copolymer of oleamide and 7.5Kg, remaining 55Kg ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of ethylene-vinyl acetate copolymer.
The ethylene-vinyl acetate copolymer negative pressure casting film that present embodiment 1 is made is delivered to Hubei Province product quality supervision and inspection research institute and is tested and obtain following performance test data such as following table.
Claims (2)
1. ethylene-vinyl acetate copolymer negative pressure casting film, composed of the following components, each components based on weight percentage, it is characterized in that: the ethylene-vinyl acetate copolymer molecular weight is at 2～500,000 consumption 79.8-89.8%, the low density polyethylene (LDPE) molecular weight is 200,000 consumption 10-20%, oleamide 0.1-0.2%, press above-mentioned three kinds of materials last, in, lower floor's materials add three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds low density polyethylene (LDPE) respectively in the body, oleamide and based on the ethylene-vinyl acetate copolymer molecular weight in 2～500,000 total amount 1/12,1/16 or 3/28 ethylene-vinyl acetate copolymer, the low density polyethylene (LDPE) addition is half of low density polyethylene (LDPE) total amount, the oleamide addition is half of oleamide total amount, remaining ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of ethylene-vinyl acetate copolymer.
2. the preparation method of ethylene-vinyl acetate copolymer negative pressure casting film according to claim 1, it is characterized in that: carry out according to the following steps: with the 79.8-89.8% molecular weight is 2～500,000 ethylene-vinyl acetate copolymers, the 10-20% molecular weight is 200,000 low density polyethylene (LDPE), three kinds of materials of 0.1-0.2% oleamide are by last, in, lower floor's materials add three respectively and stir and close body, the stirring to close of upper strata materials and lower floor's materials adds low density polyethylene (LDPE) respectively in the body, oleamide and based on the ethylene-vinyl acetate copolymer molecular weight in 2～500,000 total amount 1/12,1/16 or 3/28 ethylene-vinyl acetate copolymer, the low density polyethylene (LDPE) addition is half of low density polyethylene (LDPE) total amount, the oleamide addition is half of oleamide total amount, remaining ethylene-vinyl acetate copolymer joins stirring of middle level materials and closes in the body, carry out abundant mix, be drawn into extruder feed opening place by Material sucking machine respectively again, three equidirectional motions of extruder, be pooled to the upper end of die head at three different separately runners, form three layers of affine integrated liquefaction body, through the air inflation, typing, cooling, moulding makes three layers of compound negative pressure casting film of ethylene-vinyl acetate copolymer.
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| CN101722274B true CN101722274B (en) | 2011-12-21 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102554124A (en) * | 2012-03-28 | 2012-07-11 | 浙江阳明光伏材料有限公司 | Ethylene vinyl acetate (EVA) vacuum cast film |
| CN103524864B (en) * | 2013-10-08 | 2015-07-22 | 开原市升达塑料彩印厂 | Woven bag internally covering film |
| CN103920850B (en) * | 2014-04-28 | 2016-07-06 | 文水县易鑫铸造有限公司 | A kind of V method casting technique |
| CN104972679B (en) * | 2015-05-26 | 2017-06-16 | 武汉恒德科技有限公司 | Four layers of EVA polyester complex types negative pressure casting film and preparation method |
| CN109248988A (en) * | 2018-11-27 | 2019-01-22 | 汪杨志 | A kind of casting method of frame castings of mining machinery |
| CN112373157A (en) * | 2020-10-21 | 2021-02-19 | 永生运佳(宣城)薄膜科技有限公司 | Ultrathin EVA vacuum casting film |
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