CN104972679A - Four-layer EVA polyester composite type negative-pressure casting film and preparation method thereof - Google Patents
Four-layer EVA polyester composite type negative-pressure casting film and preparation method thereof Download PDFInfo
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- CN104972679A CN104972679A CN201510275726.0A CN201510275726A CN104972679A CN 104972679 A CN104972679 A CN 104972679A CN 201510275726 A CN201510275726 A CN 201510275726A CN 104972679 A CN104972679 A CN 104972679A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention relates to a four-layer EVA polyester composite type negative-pressure casting film and a preparation method thereof. The negative-pressure casting film is composed of 89.9%-92.3% of EVA polyester, 0.02%-0.05% of vinyl distearamide, 3%-7% of high-density polyethylene (HDPE), 3%-7% of low-density polyethylene (LDPE) and 0.08% of oleamide. The five substances are added to four stirrer drums to be stirred and mixed respectively according to materials of the first layer, the second layer, the third layer and the fourth layer and sucked to four extruder discharge ports through vacuum suckers, move in the same direction through four extruder units with different length-diameter ratios and are gathered to a pineapple transitional body in different passageways in the same die body. Under the thrust effect of four screws, an integrated liquefied body of four different interfaces is formed, sprayed out through a die orifice, and huffed, sized, cooled and formed under the inner cooling and outer air ring air cooling resultant action, and the four-layer EVA polyester composite type negative-pressure casting film is prepared. The four-layer EVA polyester film can meet the requirements for the extension performance of a film for V-method casting and can solve the adhesion problem between films and between the films and a die.
Description
Technical field
The present invention relates to a kind of four layers of EVA polyester complex type negative pressure casting film and preparation method.
Background technology
The moulding of V method is also known as negative pressure of vacuum moulding, or vacuum sealed molding, is the physics formative method of a kind of novel environment friendly dry sand solidification.This technique is shaping through Baking out overlay film on the mould with passage and air extractor with special EVA polyester complex type negative pressure casting film, after lid sandbox, insert thin dry sand and make molding sand, strike off through plain bumper vibration ramming and cover notacoria, rely on gas in vavuum pump extraction type, cause sand mold inner chamber vacuum, make sand mold inner chamber and atmospheric pressure form pressure reduction, dry sand is solidified, the die cavity required for formation without any need for adhesive.
Because this film will overlay on the mould of cast product identical appearance, mould impression is vacuumized and completely extend be attached to die surface.Therefore, film is needed to have good extension property.Can not resilience be had again after shaping, and change the physical dimension of die cavity, especially to those complex contours, as porous, the foundry goods having deep trouth, have requirement film skinning easy simultaneously, not easily occur with mould sticky glutinous.The research of this technology and applicability are promoted ripe, for V method casting technique at home application and development expanded space.
Ethylene-vinyl acetate copolymer (EVA), adopts ethylene-vinyl acetate copolymer (EVA) to become industry common recognition as V method Film Used In Casting.Because in EVA raw material, acetic acid content is higher, the tensile property of film is better, but simultaneously also more sticky glutinous, and cracky leaks gas, and destroys the shaping of die cavity vacuum.How to be the open and flat extensibility of film and shaping after not resilience and sticky glutinous functional requirement, reach the optimum efficiency of moulding simultaneously, especially along with national energy-saving reduction of discharging dynamics is increasing, conventional casting techniques is progressively eliminated, the enterprise of V method moulding is adopted to get more and more, its product becomes increasingly complex, and volume is increasing.So require that cast films technique and performance further improve, need to find out one and new prepare approach.
The patent that the applicant had previously applied for, name is called: " three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof ", the patent No.: 200910273219.8 three-layer ethylene-vinyl acetate copolymer negative pressure casting films produced, be three layers of extrusion and blow molding, exist between reel and film sticky glutinous in actual use.Especially sticky the sticking of reel core part is not easily separated, and is pullling the defect easily causing breakage of thin film applied in process.
Summary of the invention
Object of the present invention is in order to solve defect and the problem of the existence of above-mentioned prior art, a kind of four layers of EVA polyester complex type negative pressure casting film and preparation method are provided, four layers of EVA polyester complex type negative pressure casting film that the present invention produces can meet the extension property requirement of V method Film Used In Casting, can ensure again the sticky glutinous problem between film and film and between film and mould.Four layers of EVA polyester complex type negative pressure casting film of the present invention existing good extensibility when being warmed to 60 DEG C, has not resilience and not sticky stickiness simultaneously.
Object of the present invention realizes by following technical proposals.
Four layers of EVA polyester complex type negative pressure casting film, consist of the following composition, each components based on weight percentage, it is characterized in that: the content 25% of vinyl acetate VA in ethylene-vinyl acetate copolymer EVA polyester, EVA polyester overall ratio is 89.9-92.3%, vinyl bis-stearamides 0.02%-0.05%, high density polyethylene 3-7%, low density polyethylene 3-7%, oleamide 0.08%, and above-mentioned five kinds of materials are added four respectively stir in body by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds HDPE and EVA, and wherein HDPE addition is whole HDPE, and accounts for the first tunic total amount 50%, and its surplus 50% all adds EVA; Second tunic adds LDPE and EVA, and wherein the addition of LDPE is LDPE total amount, and accounts for the second tunic total amount 1/3rd, and its surplus 2/3rds all adds EVA; Third layer film adds vinyl bis-stearamides and EVA, and the addition of its medium vinyl bis-stearamides is vinyl bis-stearamides total amount, and accounts for third layer film total amount 2%, and its surplus 98% all adds EVA; 4th tunic adds the oleamide of remaining EVA and total amount; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
The preparation method of four layers of EVA polyester complex type negative pressure casting film, each components based on weight percentage, is characterized in that carrying out according to the following steps:
The 89.9-92.3%EVA polyester of the content 25% of VA in EVA polyester, 0.02%-0.05% vinyl bis-stearamides, 3-7% high density polyethylene, 3-7% low density polyethylene, 0.08% oleamide are added four respectively stir in body by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds HDPE and EVA, and wherein HDPE addition is whole HDPE, and accounts for the first tunic total amount 50%, and its surplus 50% all adds EVA; Second tunic adds LDPE and EVA, and wherein the addition of LDPE is LDPE total amount, and accounts for the second tunic 1/3rd, and its surplus 2/3rds all adds EVA; Third layer film adds vinyl bis-stearamides and EVA, and the addition of its medium vinyl bis-stearamides is vinyl bis-stearamides total amount, accounts for third layer film total amount 2%, and its surplus 98% all adds EVA; 4th tunic adds the oleamide of remaining EVA and total amount; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
The present invention searches out vinyl bis-stearamides, oleamide, HDPE and LDPE affine with EVA, and do not affect the chemistry of EVA and the material of physical property, this material has lubrication, eva film surface can be sticked to after heat fusion, form thin layer, make eva film have percentage elongation and not glue glutinous.
The present invention designs four layers of coextrusion blow eva film, it is the upgrade version of former three layers of EVA negative pressure casting film, be overcome in use the exposed deficiency of three layers of EVA cast film and the product be optimized, make the four layers of EVA polyester complex type negative pressure casting film produced.
The present invention compared with prior art has following remarkable advantage:
200910273219.8 three layers of EVA cast film of producing are three layers of extrusion and blow moldings, exist between reel and film sticky glutinous in actual use.Especially sticky the sticking of reel core part is not easily separated, and is pullling the defect easily causing breakage of thin film applied in process.The film that the present invention adopts four layers of coextrusion blow shaping, solves this contradiction, and the eva film produced can meet the extension property requirement of V method Film Used In Casting, can ensure again the sticky glutinous problem between film and film and between film and mould.
Detailed description of the invention
Embodiment 1
Be 600,000 by the 89.9kgEVA molecular weight of polyesters of the content 25% of VA in EVA polyester, 0.02kg vinyl bis-stearamides, 5kg high density polyethylene molecular weight be 200,000,5kg low density polyethylene molecular weight is 200,000,0.08kg oleamide adds four respectively stir in bodies by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds 5kgHDPE and 5kg EVA; Second tunic adds 5kg LDPE and 10kg EVA; Third layer film adds 0.02kg vinyl bis-stearamides and 0.98kgEVA; 4th tunic adds the oleamide of remaining 73.92kgEVA and 0.08kg; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
Embodiment 2
Be 600,000 by the 92.3kgEVA molecular weight of polyesters of the content 25% of VA in EVA polyester, 0.05kg vinyl bis-stearamides, 4.57kg high density polyethylene molecular weight be 500,000,3kg low density polyethylene molecular weight is 200,000,0.08kg oleamide adds four respectively stir in bodies by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds 4.57kg HDPE and 4.57kg EVA; Second tunic adds 3kg LDPE and 6kg EVA; Third layer film adds 0.05kg vinyl bis-stearamides and 2.45kgEVA; 4th tunic adds the oleamide of remaining 79.28kgEVA and 0.08kg; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
Embodiment 3
Be 600,000 by the 91.1kgEVA molecular weight of polyesters of the content 25% of VA in EVA polyester, 0.04kg vinyl bis-stearamides, 4.78kg high density polyethylene molecular weight be 500,000,4kg low density polyethylene molecular weight is 200,000,0.08kg oleamide adds four respectively stir in bodies by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds 4.78kg HDPE and 4.78kg EVA; Second tunic adds 4kg LDPE and 8kg EVA; Third layer film adds 0.04kg vinyl bis-stearamides and 1.96kgEVA; 4th tunic adds the oleamide of remaining 76.36kgEVA and 0.08kg; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
5 parts, the ethylene-vinyl acetate copolymer negative pressure casting film sample that the present embodiment 1 is obtained is delivered to Hubei Product Quality Supervision and Inspection Research Institute to test and obtain following performance test data as following table.
Claims (2)
1. four layers of EVA polyester complex type negative pressure casting film, consist of the following composition, each components based on weight percentage, it is characterized in that: the content 25% of vinyl acetate VA in ethylene-vinyl acetate copolymer EVA polyester, EVA polyester overall ratio is 89.9-92.3%, vinyl bis-stearamides 0.02%-0.05%, high density polyethylene 3-7%, low density polyethylene 3-7%, oleamide 0.08%, and above-mentioned five kinds of materials are added four respectively stir in body by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds HDPE and EVA, and wherein HDPE addition is whole HDPE, and accounts for the first tunic total amount 50%, and its surplus 50% all adds EVA; Second tunic adds LDPE and EVA, and wherein the addition of LDPE is LDPE total amount, and accounts for the second tunic total amount 1/3rd, and its surplus 2/3rds all adds EVA; Third layer film adds vinyl bis-stearamides and EVA, and the addition of its medium vinyl bis-stearamides is vinyl bis-stearamides total amount, and accounts for third layer film total amount 2%, and its surplus 98% all adds EVA; 4th tunic adds the oleamide of remaining EVA and total amount; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
2. utilize the preparation method of four layers of EVA polyester complex type negative pressure casting film described in claim 1, each components based on weight percentage, it is characterized in that carrying out according to the following steps:
The EVA polyester of the 89.9-92.3% of the content 25% of VA in EVA polyester, 0.02%-0.05% vinyl bis-stearamides, 3-7% high density polyethylene, 3-7% low density polyethylene, 0.08% oleamide are added four respectively stir in body by the first tunic, the second tunic, third layer film, the 4th tunic materials; First tunic adds HDPE and EVA, and wherein HDPE addition is whole HDPE, and accounts for the first tunic total amount 50%, and its surplus 50% all adds EVA; Second tunic adds LDPE and EVA, and wherein the addition of LDPE is LDPE total amount, and accounts for the second tunic 1/3rd, and its surplus 2/3rds all adds EVA; Third layer film adds vinyl bis-stearamides and EVA, and the addition of its medium vinyl bis-stearamides is vinyl bis-stearamides total amount, accounts for third layer film total amount 2%, and its surplus 98% all adds EVA; 4th tunic adds the oleamide of remaining EVA and total amount; Above-mentioned composition is joined respectively in four mixer buckets, be uniformly mixed fully, the feed opening place of four extruders is drawn into by suction feeder, the extruder unit different through four draw ratios moves in the same way, in different runners in same die body, be pooled to the transition body of pineapple body, under the thrust of four screw rods, form four kinds of different interface integration liquefaction bodies, sprayed to die orifice by adjustable ring, under force action via the air cooling of interior cold and outer vane, inflation, sizing, cooling forming, make four layers of compound negative pressure casting film of EVA.
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| CN104972679B CN104972679B (en) | 2017-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135965A (en) * | 1996-03-04 | 1996-11-20 | 南亚塑胶工业股份有限公司 | Process for producing composite plastic coating by thermal plastic polyolefin resin and ethylene-vinyl acetate copolymer |
| CN1458224A (en) * | 2003-04-25 | 2003-11-26 | 北京华盾塑料有限责任公司 | EVA high thermal insulation covering film series and its producing process |
| US20090302495A1 (en) * | 2006-03-15 | 2009-12-10 | Fujifilm Corporation | Solution casting method and solution casting apparatus for film manufacture |
| CN101722274A (en) * | 2009-12-15 | 2010-06-09 | 武汉恒德科技有限公司 | Three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof |
| CN104558802A (en) * | 2015-01-08 | 2015-04-29 | 上海海优威新材料股份有限公司 | Surface radiation pre-crosslinking ethylene-vinyl acetate resin film for photovoltaic module and preparation method of resin film |
-
2015
- 2015-05-26 CN CN201510275726.0A patent/CN104972679B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135965A (en) * | 1996-03-04 | 1996-11-20 | 南亚塑胶工业股份有限公司 | Process for producing composite plastic coating by thermal plastic polyolefin resin and ethylene-vinyl acetate copolymer |
| CN1458224A (en) * | 2003-04-25 | 2003-11-26 | 北京华盾塑料有限责任公司 | EVA high thermal insulation covering film series and its producing process |
| US20090302495A1 (en) * | 2006-03-15 | 2009-12-10 | Fujifilm Corporation | Solution casting method and solution casting apparatus for film manufacture |
| CN101722274A (en) * | 2009-12-15 | 2010-06-09 | 武汉恒德科技有限公司 | Three-layer ethylene-vinyl acetate copolymer negative pressure casting film and preparation method thereof |
| CN104558802A (en) * | 2015-01-08 | 2015-04-29 | 上海海优威新材料股份有限公司 | Surface radiation pre-crosslinking ethylene-vinyl acetate resin film for photovoltaic module and preparation method of resin film |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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