CN105037915A - Preparation method of EVA foamed thin film - Google Patents

Preparation method of EVA foamed thin film Download PDF

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Publication number
CN105037915A
CN105037915A CN201510554411.XA CN201510554411A CN105037915A CN 105037915 A CN105037915 A CN 105037915A CN 201510554411 A CN201510554411 A CN 201510554411A CN 105037915 A CN105037915 A CN 105037915A
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CN
China
Prior art keywords
foaming
eva
master batch
film
thin sheet
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Pending
Application number
CN201510554411.XA
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Chinese (zh)
Inventor
徐冬梅
朱兆鑫
柳峰
权祥
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Xuzhou College of Industrial Technology
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Xuzhou College of Industrial Technology
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Priority to CN201510554411.XA priority Critical patent/CN105037915A/en
Publication of CN105037915A publication Critical patent/CN105037915A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • 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
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Abstract

The invention discloses a preparation method of an EVA foamed thin film. The method includes the steps of preparing a foaming master material, preparing a foaming promoting master material and conducting extruding, blow molding and foaming of the thin film. When the master material is prepared, the foaming master material is prepared through a low-temperature extrusion method so that foaming in the extrusion granulating process can be avoided; by means of the foaming promoting master material, foaming agents can be promoted to decompose as completely as possible in the film blowing process; the two types of master materials and EVA resin are evenly mixed according to the ratio of 1 to 1 to 10 and then added into an extruder to be plasticized and blown to form the film. The master materials are foamed during plasticizing and extruding, and the structure and shape of foams can be adjusted by adjusting the main machine speed and the traction speed. According to the method, the film foaming product can be easily obtained. The film foaming product is suitable for producing rubber feeding bags, low in melting point, easy to tear off, small in density, capable of lowering material consumption, and capable of reducing production cost. Due to the fact that the product is good in mechanical property and tear-off performance, the application range of the product can be further enlarged; when the film is applied to rubber small component packaging bags and the like, resource waste can be greatly reduced, and recycling can be improved.

Description

A kind of manufacture method of EVA foamed thin sheet
Technical field
The present invention relates to a kind of manufacture method of film foams, particularly a kind of rubber feeds intake the manufacture method of bag film foams.
Background technology
Foam material, as sponge, have light weight, excellent property, the plurality of advantages such as production cost is lower, are widely used in every profession and trade, as various spring protective product, mattress, seat cushion, vibration isolating pad etc.
Existing rubber feeds intake bag, generally extrude blown film by LDPE resin through forcing machine to obtain, this existing rubber feeds intake bag, because fusing point is high, Kekelé structure count is poor, dispersiveness is bad, have impact to rubber components, being not suitable for feeds intake to rubber directly applies, and current multiplex various method that is blended or interpolation auxiliary agent improves these shortcomings.This method is generally by always mixing with the resin of low melting point, also having the mode by adding various auxiliary agent, utilizing these methods, makes the rubber generally used now and to feed intake bag.
These ameliorative way are all comparatively complicated above, and effect is generally poor, affect by factors such as cost, technology difficulty, cost of labor height; Existing general rubber feeds intake bag, is generally poor-performing and the higher present situation of price, is difficult to the production cost reducing rubber product.And produce a kind of excellent property, product innovation that rubber that price is lower feeds intake desired by Dai Shi rubber production enterprise.
Summary of the invention
According to the deficiencies in the prior art, the invention provides a kind of preparation method with the EVA film foaming of stronger mechanical strength.
The present invention realizes by following technical scheme:
A manufacture method for EVA foamed thin sheet, the method comprises the following steps:
A) preparation of foaming master batch: carry out granulation by after EVA resin and whipping agent melting mixing, obtain foaming master batch;
B) foaming promotes the preparation of master batch: take EVA resin as carrier, foamed promoter is masterbatch core, enters extruding pelletization and obtains foaming promotion master batch;
C) foaming master batch and foaming are promoted that master batch joins in forcing machine after mixing in the ratio of 1:1:10 with EVA resin, extruded by cross-head after fusion plastification, then through foaming, inflation, carry out traction rolling finally by traction and crimping device, finally obtain EVA foamed thin sheet.
Preferably, before extrusion equipment foaming master batch and foaming promote master batch, high-speed mixer is utilized to mix respectively by each group.
Preferably, the extrusion temperature in the preparation process of foaming master batch remains between 85 DEG C ~ 95 DEG C.As with the granulation of CTE-35 twin screw compounding forcing machine, 1-7 district is set and head temperature is respectively 85 DEG C, 90 DEG C, 95 DEG C, 95 DEG C, 100 DEG C, 100 DEG C, 105 DEG C, 100 DEG C, whipping agent adds from the side spout (main frame four district) of twin screw extruder, main feeding frequency 4HZ, main frame frequency 5HZ.Regulate main frame feeding and engine speed (frequency) to control melt temperature within 85 ~ 95 DEG C, thus avoid whipping agent decomposes and foam.
Preferably, before extruding blown film, foaming master batch and foaming are promoted that master batch mixes.
Preferably, between temperature 130 DEG C ~ 150 DEG C, blown film is carried out.As extruded with SJM-Z45 × 28 × 650 inflation film manufacturing machine, foaming, inflation.Forcing machine 1-3 district and and head temperature be 130/140/150/150 DEG C, and by regulating blow-up ratio (2 ~ 3) and ratio of drawing (4 ~ 6) the adjustment width of film, thickness and foam structure.
Preferably, auxiliary agent is added with in foaming master batch.Auxiliary agent can be nucleator, as talcum powder etc., also can be functional aid, as lubricant and dispersion agent.
Beneficial effect of the present invention:
According to the inventive method, can obtain easily the obtained rubber of eva film foaming feed intake bag, there is certain mechanical property, be applicable to rubber and feed intake use, the advantage such as accomplished that fusing point is low, Kekelé structure count good, little on rubber components impact, technique simple, cost is lower, is specially adapted to rubber and feeds intake the use of bag.Owing to having good mechanical property, expand the range of application of product further, as being applied to the packing bag of rubber small component raw material, can greatly reduce the wasting of resources, raising recycles.
Embodiment
A manufacture method for EVA foamed thin sheet, the method comprises the following steps:
A) preparation of foaming master batch: carry out granulation by after EVA resin and whipping agent melting mixing, obtain foaming master batch;
B) foaming promotes the preparation of master batch: take EVA resin as carrier, foamed promoter is masterbatch core, enters extruding pelletization and obtains foaming promotion master batch;
C) foaming master batch and foaming are promoted that master batch joins in forcing machine after mixing in the ratio of 1:1:10 with EVA resin, extruded by cross-head after fusion plastification, then through foaming, inflation, carry out traction rolling finally by traction and crimping device, finally obtain EVA foamed thin sheet.
When preparing foaming master batch, first at high temperature start forcing machine.High temperature start can be determined according to the clout in barrel, generally all higher than 140 DEG C, experiment desirable value is progressively reduced the temperature to after forcing machine is opened, as with the granulation of CTE-35 twin screw compounding forcing machine, 1-7 district is set and head temperature is respectively 85 DEG C, 90 DEG C, 95 DEG C, 95 DEG C, 100 DEG C, 100 DEG C, 105 DEG C, 100 DEG C, and stable after add whipping agent from side feeding.In order to melt temperature time prepared by the quality control master batch improving foaming master batch is in 85 DEG C ~ 95 DEG C.
While preparing foaming master batch, foamed promoter is also made pellet by powder and namely to foam promotion master batch.Can improve and resin, mixture homogeneity between foaming concentrate, thus better improve foaming effect.
Prioritizing selection coupling agent and high-speed mixer when preparing master batch, the surface bonding power between each component can be increased, through high-speed mixing, each component is fully mixed, can preventing like this lumps between component mutually affects mixed effect, by obtaining the uniform masterbatch of component after forcing machine extruding pelletization.
Comparative high temperature (130 DEG C ~ 150 DEG C) is selected in blown film foaming, and SJM-Z45 × 28 × 650 inflation film manufacturing machine is extruded, foam, inflation.Forcing machine 1-3 district and and head temperature be 130/140/150/150 DEG C, and by regulating blow-up ratio (2 ~ 3) and ratio of drawing (4 ~ 6) the adjustment width of film, thickness and foam structure.Promote that foaming increases abscess quantity completely, improves the quality of abscess.Improving foam structure through inflation and drawing-off, allowing film in length and breadth to orientation (stretchings) occurring thus the higher mechanical property of acquisition simultaneously.
Foaming master batch is added with auxiliary agent.Auxiliary agent can be nucleator, as talcum powder, can be also functional aid, as coupling agent.Auxiliary agent is added with in foamed promoter granulation.Auxiliary agent can be dispersion agent, as whiteruss etc.
According to the inventive method, eva film foam material, the foamed thin sheet with excellent mechanical property can be obtained easily, surface has abscess, quality is light, density is little, blown film and foaming be combined with each other, accomplish excellent property, economize on resources, be specially adapted to manufacture various rubber to feed intake bag, have that fusing point is low, mechanical property good, Kekelé structure count is better, little on rubber components impact.Owing to having good mechanical property, expand product use range further, as the packing bag etc. for rubber small component, effectively can reduce the production cost of rubber, raising greatly recycles, economizes on resources, and promotes green production.

Claims (6)

1. a manufacture method for EVA foamed thin sheet, is characterized in that: the method comprises the following steps:
A) preparation of foaming master batch: carry out granulation by after EVA resin and whipping agent melting mixing, obtain foaming master batch;
B) foaming promotes the preparation of master batch: take EVA as vector resin, foamed promoter is masterbatch core, promotes master batch through extruding pelletization preparation foaming;
C) foaming master batch and foaming are promoted that master batch joins in forcing machine after mixing in the ratio of 1:1:10 with EVA resin, extruded by cross-head after fusion plastification, then through foaming, inflation, carry out traction rolling finally by traction and crimping device, finally obtain EVA foamed thin sheet.
2. the manufacture method of a kind of EVA foamed thin sheet according to claim 1, is characterized in that: be between 85 DEG C ~ 95 DEG C in temperature, carries out granulation, obtain foaming master batch by after EVA resin and promoter for blowing agent melting mixing.
3. the manufacture method of a kind of EVA foamed thin sheet according to claim 1, is characterized in that: the foamed promoter of powdery is made pellet, increase with foaming concentrate mix equal and degree.
4. the manufacture method of a kind of EVA foamed thin sheet according to claim 1, is characterized in that: be carry out between 130 DEG C ~ 150 DEG C extruding, foaming and inflation in temperature, impels whipping agent to foam completely, increases cell density.
5. the manufacture method of a kind of EVA foamed thin sheet according to claim 1, is characterized in that: regulate blow-up ratio and ratio of drawing to control the shape of the width of film, thickness and abscess.
6. the manufacture method of a kind of EVA foamed thin sheet according to claim 1, is characterized in that: be added with auxiliary agent in foaming master batch, as dispersion agent or lubricant.
CN201510554411.XA 2015-09-01 2015-09-01 Preparation method of EVA foamed thin film Pending CN105037915A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108715055A (en) * 2018-05-23 2018-10-30 枣阳市华星纺织有限公司 A kind of manufacturing method of high ventilative woven bag
CN108859263A (en) * 2018-05-23 2018-11-23 枣阳市华星纺织有限公司 A kind of manufacturing method of interior viscid film plastic woven bag
CN109503880A (en) * 2017-09-14 2019-03-22 上海译科实业有限公司 A kind of foaming master batch and preparation method thereof

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CN104277319A (en) * 2014-10-10 2015-01-14 义乌市大胜橡塑制品有限公司 Method for eliminating peculiar smell of EVA (ethylene-vinyl acetate) foamed material
CN104419101A (en) * 2013-08-23 2015-03-18 上海杰事杰新材料(集团)股份有限公司 Polypropylene graft microcellular foaming material and preparation method thereof

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CN1793213A (en) * 2005-12-30 2006-06-28 上海心尔塑胶材料有限公司 Process for preparing foamed filling mother material of EVA (ethylene-acetate ethylene copolymer)
CN104419101A (en) * 2013-08-23 2015-03-18 上海杰事杰新材料(集团)股份有限公司 Polypropylene graft microcellular foaming material and preparation method thereof
CN104277319A (en) * 2014-10-10 2015-01-14 义乌市大胜橡塑制品有限公司 Method for eliminating peculiar smell of EVA (ethylene-vinyl acetate) foamed material

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109503880A (en) * 2017-09-14 2019-03-22 上海译科实业有限公司 A kind of foaming master batch and preparation method thereof
CN108715055A (en) * 2018-05-23 2018-10-30 枣阳市华星纺织有限公司 A kind of manufacturing method of high ventilative woven bag
CN108859263A (en) * 2018-05-23 2018-11-23 枣阳市华星纺织有限公司 A kind of manufacturing method of interior viscid film plastic woven bag

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