CN106554535A - Rotational moulding expanded polyethylene composition and polyethylene foam product - Google Patents
Rotational moulding expanded polyethylene composition and polyethylene foam product Download PDFInfo
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- CN106554535A CN106554535A CN201510639985.7A CN201510639985A CN106554535A CN 106554535 A CN106554535 A CN 106554535A CN 201510639985 A CN201510639985 A CN 201510639985A CN 106554535 A CN106554535 A CN 106554535A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- C08J9/06—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 by a chemical blowing agent
- C08J9/10—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 by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- 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
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
-
- 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
- C08J2323/06—Polyethene
-
- 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
- C08J2423/06—Polyethene
-
- 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
- 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
- C08L2205/24—Crystallisation aids
-
- 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
-
- 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 discloses a kind of rotational moulding expanded polyethylene composition and polyethylene foam product.Said composition contains the nucleator of the polyethylene blend of 100 weight portions, the foaming agent of 1-5 weight portions, the antioxidant of 0.1-1 weight portions, the lubricant of 0.1-1 weight portions and 0.1-1 weight portions；Wherein, the crystallization heat content of the polyethylene blend is below 120J/g, and the density of the polyethylene blend is 0.93-0.96g/cm3, the melt index of the polyethylene blend is 3-7g/10min；On the basis of the gross weight of the polyethylene blend, the blend contains the Low Density Polyethylene B of high density polyethylene (HDPE) A and 5-20 weight % of 80-95 weight %.The polyethylene foam product for obtaining can have more preferable foam structure, higher intensity.
Description
Technical field
The present invention relates to a kind of rotational moulding expanded polyethylene composition and a kind of polyethylene foam product.
Background technology
Rotational molding foaming product have light specific gravity, sound insulation, it is heat-insulated the features such as, market demand increase it is fast
Speed.But the rotational molding process for preparing the foaming product is more special, belong to without foam, it is desirable to send out
Bubble resin has preferable mobility and melt strength.But the higher resin of melt strength, processing flowing
Property can be poor, so selecting Foamex and method of modifying for successful rotational molding foaming
It is most important.The method being crosslinked, but the more difficult control of cross-linking process are adopted for more on this market, is easier to out
Now it is crosslinked too early, and the degree of cross linking is crossed conference and causes expansion ratio to reduce.Therefore noncrosslinking Foamex
System has more preferable processing characteristics.But noncrosslinking Foamex system is carrying out the foaming course of processing
In, the foam that resin viscosity change will affect foaming to be formed, if for example viscosity declines rapidly, it will be difficult to
Gas is maintained, foam is easy to rupture or melts simultaneously.At present on foaming product market, polyethylene material should
With relatively wide, therefore, the good noncrosslinking Foamex system of foam structure how is obtained, especially
Polyethylene system is the problem highly studied.
US2008/0128937A1 discloses a kind of foamable polyethylene composition, linear including (I)
Ethylene copolymer composition, with the molecule that MI is 3-8, density 0.93-0.96g/cc and 1.5-3.0
Amount distribution；(II) foaming agent and (III) foaming nucleation agent.Ethylene copolymer composition includes at least one
The copolymer of ethylene and at least one monomer in butene-1, hexene -1 and octene-1.
JP2003-327757 improves melt strength by adding cross-linking agent, but due to the addition of cross-linking agent,
The more difficult control of reaction, shortens the span of control of resin expanded process, and gel is not to the outward appearance of product
Profit.
US5366675A discloses a kind of method of molded foaming mesopore product, including prepares and can send out
The polyvinyl mixture of powders of bubble, which includes the polymerization of the ethylenic with ester group of 0.5-7.5 weight portions
Thing, its MI are higher than polyvinyl；The CBA of effective dose；With 0.01-2 weight portions
Nucleator；And the rotational molding molding under conditions of foaming and melting by the mixture of powders.It is described
Ethylenic polymer with ester group is ethyl vinyl ester copolymer, is further ethylene vinyl
Ester (EVA).The method adds EVA, although improve the mobility of resin, but the intensity of resin
And temperature tolerance has declined, rotational molding overlong time or the too high meeting of temperature cause abscess to be substantially roughened.
Therefore, in order to improve, prior art acquisition even aperture distribution, intensity are higher, easy to process to be sent out
Brewage, it is desirable to provide suitable polyethylene foam compositionss, to obtain desired polyethylene foam product.
The content of the invention
The invention aims to improve the abscess quality and bubble of the polyethylene foam product that rotational moulding is obtained
The compressive strength in hole, there is provided a kind of rotational moulding expanded polyethylene composition and a kind of polyethylene foam system
Product.
To achieve these goals, the invention provides a kind of rotational moulding expanded polyethylene composition, the group
Compound contains the polyethylene blend of 100 weight portions, the foaming agent of 1-5 weight portions, 0.1-1 weight portions
The nucleator of antioxidant, the lubricant of 0.1-1 weight portions and 0.1-1 weight portions；Wherein, the polyethylene
The crystallization heat content of blend is below 120J/g, and the density of the polyethylene blend is
0.93-0.96g/cm3, the melt index of the polyethylene blend is 3-7g/10min；With the poly- second
On the basis of the gross weight of alkene blend, the blend contain 80-95 weight % high density polyethylene (HDPE) A and
The Low Density Polyethylene B of 5-20 weight %.
Present invention also offers a kind of polyethylene foam product, wherein, the polyethylene foam product is by this
The rotational moulding expanded polyethylene composition of bright offer is prepared by rotational foaming, and rotational moulding temperature is
200-240 DEG C, the rotational moulding time is 20-26min.
The rotational moulding expanded polyethylene composition that the present invention is provided, by controlling polyethylene blend therein
Physical and chemical indexes, such as crystallization heat content, density and melt index can be provided and be suitable for the poly- of rotational foaming
Vinyl composition, the polyethylene foam product that Jing is further prepared can have more preferable abscess matter
Amount, such as little and uniform foam structure, product surfaces externally and internally are smooth, uniform wall thickness, and higher bubble
The compressive strength in hole, more than 0.7MPa, processing characteristics is excellent in addition and easy mold release.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of description, with
Detailed description below is used for explaining the present invention together, but is not construed as limiting the invention.
In accompanying drawing：
Fig. 1 is the abscess cross-section photograph of polyethylene foam product prepared by comparative example 1；
Fig. 2 is the abscess cross-section photograph of polyethylene foam product prepared by embodiment 1.
Specific embodiment
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides a kind of rotational moulding expanded polyethylene composition, said composition contains 100 weight portions
Polyethylene blend, the foaming agent of 1-5 weight portions, the antioxidant of 0.1-1 weight portions, 0.1-1 weight portions
Lubricant and 0.1-1 weight portions nucleator；Wherein, the crystallization heat content of the polyethylene blend is
Below 120J/g, the density of the polyethylene blend is 0.93-0.96g/cm3, the polyethylene blend
The melt index of thing is 3-7g/10min；On the basis of the gross weight of the polyethylene blend, the blending
Thing contains the Low Density Polyethylene B of high density polyethylene (HDPE) A and 5-20 weight % of 80-95 weight %.
In the present invention, inventor's research finds, controls the poly- second in rotational moulding expanded polyethylene composition
The crystallization heat content of alkene blend, can provide that foam structure is more preferable, the foaming product that compressive strength is high.It is excellent
The crystallization heat content for selecting polyethylene blend is 100-120J/g.If crystallization heat content is less than 100J/g, send out
There is intensity low defect in brewage；If crystallization heat content be more than 120J/g, foaming product exist abscess compared with
Greatly, skewness defect.It is highly preferred that the crystallization heat content of polyethylene blend is 108-115J/g, can
To obtain the polyethylene foam product of better quality.Crystallization heat content can be according to GB/T 19466.3-2004
Method measurement.
In the present invention, while the crystallization heat content of polyethylene blend is controlled, from composition polyethylene altogether
Polymers composition as described above, control polyethylene blend density and melt index within the above range,
The polyethylene foam product of preparation can be provided while the surface of higher compressive strength and smooth even.
According to the present invention, the polyethylene blend can be the mixture of various polyethylene, main to meet
The blend of offer has the physical and chemical indexes of above-mentioned restriction.Under preferable case, high density polyethylene (HDPE) A
Density be 0.935-0.96g/cm3, melt index is 3-6g/10min.
, according to the invention it is preferred in the case of, the density of Low Density Polyethylene B is 0.92-0.93g/cm3,
Melt index is 2-20g/10min.
, according to the invention it is preferred in the case of, the foaming agent is production of low-temperature foaming agent.
Preferably, the decomposition temperature of foaming agent is 160 DEG C -180 DEG C, and gas forming amount is 120-140ml/g.
It is highly preferred that the foaming agent is 4,4- OBSHs.
, according to the invention it is preferred in the case of, the antioxidant is antioxidant 1010 and/or irgasfos 168.
In the present invention, the nucleator can be Pulvis Talci, Calcium Carbonate.
In the present invention, the lubricant can be stearic acid, such as zinc stearate, calcium stearate.
, according to the invention it is preferred in the case of, the expanded polyethylene composition can be by screw extruder
On carry out extruding pelletization preparation, extrusion temperature is 10 ± 4 DEG C of the fusing point higher than the polyethylene blend,
Screw speed is 80-150rpm.
, according to the invention it is preferred in the case of, the extrusion temperature is 125-135 DEG C.
In the present invention, prepare expanded polyethylene composition method also include by extrusion obtain it is granulated
Pellet is obtained within 3 hours in 60 DEG C of dryings；Then, after be ground pellet, screen out less than 35 mesh grains
The powder in footpath, as the raw material for preparing polyethylene foam product.
Present invention also offers a kind of polyethylene foam product, wherein, the polyethylene foam product is by this
The rotational moulding expanded polyethylene composition of bright offer is prepared by rotational foaming, and rotational moulding temperature is
200-240 DEG C, the rotational moulding time is 20-26min.
, according to the invention it is preferred in the case of, the compressive strength of the polyethylene foam product is 0.7MPa
More than.Preferred compressed intensity is 0.7-1MPa.
According to the present invention, the polyethylene foam product for obtaining has more preferable foam structure, under preferable case,
The Average Cell aperture of the polyethylene foam product is less than 750 μm, and abscess pore-size distribution is
100-120μm.Average Cell aperture and abscess pore-size distribution can be used for the abscess knot that weight obtains product
Structure, can be by using optical microscope (Shanghai Pu Dan optical instruments company KTL-24B/C, times magnification
Number X70) observe the section of product and take a picture (such as Fig. 1 and Fig. 2), measure the aperture of the abscess on photo
(diameter), then be calculated.Average Cell aperture refers to the aperture of multiple abscesses in the above-mentioned photo of statistics,
By formula d=∑ nidi/∑ni(niFor the number in hole, diFor the diameter in hole) calculate the average diameter tried to achieve.
In above range, the abscess quality that the product that rotational moulding is obtained can have is preferably described in Average Cell aperture
The Average Cell aperture of polyethylene foam product is 600-800 μm.Abscess pore-size distribution can be according to upper
The aperture of the abscess counted in stating photo, by formula(diFor the diameter in hole, N-
The number of abscess, d be Average Cell aperture) be calculated, illustrate statistics abscess aperture in relative to
The extent of deviation of Average Cell aperture d；In above range, the product that rotational moulding is obtained obtains uniform abscess.
Hereinafter will be described the present invention by embodiment.
In following examples, density polymer is measured and is determined according to method B of ASTM D792-2013；
Crystallization heat content is measured according to the method for GB/T 19466.3-2004, by differential scanning calorimetry
(DSC) program is warming up to 170 DEG C from 40 DEG C, then is cooled to 40 DEG C, and warming and cooling rate is 10 DEG C/min；
Method of the melt index (MI) according to ASTM D-1238, is 2.16Kg in 190 DEG C, load
Lower measurement and determination；
Method according to GB/T 6343-2009 measures the apparent density of foam plasticss, and passes through following formula meter
Calculate expansion ratio：Density after density/foaming before expansion ratio=foaming；
Compressive strength is measured and is determined according to the method for GB/T 8813-2008, and test is carried out at 23 DEG C；
In embodiment and comparative example, used polyvinyl resin is as follows：
High density polyethylene -1：Density is 0.937g/cc, melt index (MI) is 6g/10min；
High density polyethylene -2, density is 0.963g/cc, melt index (MI) is 8g/10min；
Low density polyethylene -1, density is 0.926g/cc, melt index (MI) is 20g/10min；
Low density polyethylene -2, density is 0.926g/cc, melt index (MI) is 2g/10min.
Other foaming agent, antioxidant, nucleator and lubricant are commercially available.
Embodiment 1
The present embodiment is used to illustrate that the rotational moulding expanded polyethylene composition and polyethylene of present invention offer to be sent out
Brewage.
(1) mix：Constitute according to the material that table 1 is listed, measure density, the knot of polyethylene blend
Brilliant heat content and melt index, the results are shown in Table 2.Various materials are added and is stirred to mixing in agitator
Uniformly；
(2) pelletize：Add mixture into double screw extruder (Thermo Fisher company RheoDrive16
Model) extruding pelletization is carried out, extrusion temperature, screw speed are as shown in table 1.By granulated 60
DEG C drying obtains pellet in 3 hours, is rotational moulding expanded polyethylene composition；
(3) grind and sieve：After pellet is ground, the powder less than 35 mesh particle diameters is screened out,
As rotational foaming raw material；
(4) rotational foaming：The rotational foaming raw material of 600g is added in mould, the rolling being shown in Table 1
Rotational foaming is carried out under the conditions of modeling, finally cooling, the demoulding obtains rotation molding polyethylene foaming product.
The pressure density of the polyethylene foam product that measurement is obtained, calculates expansion ratio, table in observation product
Face, the results are shown in Table 2.
The polyethylene foam product for obtaining is cut and with micro- sem observation abscess section and abscess quality, and
Take a picture Fig. 2 photo, measure and calculate Average Cell aperture and abscess pore-size distribution, the results are shown in Table 2.
In Fig. 2, foam aperture is less, is evenly distributed, and illustrates that the product has good foam structure.
Embodiment 2-3
The present embodiment is used to illustrate that the rotational moulding expanded polyethylene composition and polyethylene of present invention offer to be sent out
Brewage.
According to the method for embodiment 1, measurement table 1 list material composition polyethylene blend density,
Crystallization heat content and melt index, are shown in Table 2.
The material composition and condition listed according to table 1 obtains rotational moulding expanded polyethylene composition and poly- second
Alkene foaming product.
The pressure density of the polyethylene foam product that measurement is obtained, calculates expansion ratio, table in observation product
Face, the results are shown in Table 2.
The polyethylene foam product for obtaining is cut and with micro- sem observation abscess section and abscess quality, is surveyed
Average Cell aperture and abscess pore-size distribution are measured and calculated, 2 are the results are shown in Table.
Comparative example 1
The density of the polyethylene listed according to the method for embodiment 1, measurement table 1, crystallization heat content and melting
Index, is shown in Table 2.
The material composition and condition listed according to table 1 obtains expanded polyethylene composition and polyethylene foam
Product.
The pressure density of the polyethylene foam product that measurement is obtained, calculates expansion ratio, table in observation product
Face, the results are shown in Table 2.
The polyethylene foam product for obtaining is observed into abscess section and abscess matter according to the method for embodiment 1
Amount, Fig. 1 is cross-section photograph, measures and calculates Average Cell aperture and abscess pore-size distribution, the results are shown in Table
2。
In Fig. 1, abscess is bigger than normal, skewness, and upper surface has abscess coarsening phenomenon, the abscess of the product
Structure is bad.
Comparative example 2-4
According to the method for embodiment 1, the density of the polyethylene or polyethylene blend of measurement table 1, crystallization
Heat content and melt index, are shown in Table 2.
The material composition and condition listed according to table 1 obtains expanded polyethylene composition and polyethylene foam
Product.
The pressure density of the polyethylene foam product that measurement is obtained, calculates expansion ratio, table in observation product
Face, the results are shown in Table 2.
Table 1
Table 2
The foaming that present invention offer be can be seen that by the result of embodiment and comparative example and table 1-2 gathers
Polyethylene blend in vinyl composition, when crystallization heat content is controlled in the scope of 100-120J/g, system
Standby foaming product can have more preferable foam structure, and such as abscess pore-size distribution embodies foam cell uniformity.
For example in comparative example 1-3, crystallization heat content is higher than 120J/g, and as a result the pore-size distribution numerical value of foaming product is big
Illustrate that abscess pore-size distribution is uneven.The melt index of polyethylene blend can ensure that polyethylene foamed is combined
Mobility of the thing in processing, it is ensured that foaming product surface more flat smooth.And suitably blend is close
Degree determines the strength of materials, and such as comparative example 4, blend material density are relatively low, the foaming product for obtaining
Compressive strength is relatively low.
In embodiment 1-3, foaming product prepared by the expanded polyethylene composition that the present invention is provided, abscess
Between 100-120 μm, melt index large fluidity is good, and compressive strength is big for uniformity pore-size distribution
All have clear improvement in 0.7MPa.
The non-crosslinked expanded polyethylene composition that the present invention is provided can ensure that it is higher that foaming product has
On the premise of compressive strength, improve the uniformity of abscess, obtain the narrower product of pore-size distribution, and carry
High product surface smoothness.
Claims (10)
1. a kind of rotational moulding expanded polyethylene composition, said composition contain the polyethylene of 100 weight portions
Blend, the foaming agent of 1-5 weight portions, the antioxidant of 0.1-1 weight portions, the lubricant of 0.1-1 weight portions
With the nucleator of 0.1-1 weight portions；Characterized in that, the crystallization heat content of the polyethylene blend is
Below 120J/g, the density of the polyethylene blend is 0.93-0.96g/cm3, the polyethylene blend
The melt index of thing is 3-7g/10min；On the basis of the gross weight of the polyethylene blend, the blending
Thing contains the Low Density Polyethylene B of high density polyethylene (HDPE) A and 5-20 weight % of 80-95 weight %.
2. expanded polyethylene composition according to claim 1, wherein, polyethylene blend
Crystallization heat content is 100-120J/g；Preferably, the crystallization heat content of polyethylene blend is 108-117J/g.
3. expanded polyethylene composition according to claim 1 and 2, wherein, high-density polyethylene
The density of alkene A is 0.935-0.96g/cm3, melt index is 3-6g/10min.
4. the expanded polyethylene composition according to any one in claim 1-3, wherein, it is low
The density of density polyethylene B is 0.92-0.93g/cm3, melt index is 2-20g/10min.
5. the expanded polyethylene composition according to any one in claim 1-4, wherein, institute
It is production of low-temperature foaming agent to state foaming agent, and the decomposition temperature of preferred foaming agent is 160 DEG C -180 DEG C, and gas forming amount is
120-140ml/g, more preferably described foaming agent are 4,4- OBSHs；The antioxidant is antioxygen
Agent 1010 and/or irgasfos 168.
6. the expanded polyethylene composition according to any one in claim 1-5, wherein, should
Expanded polyethylene composition by carrying out extruding pelletization preparation on screw extruder, extrusion temperature be higher than
10 ± 4 DEG C of the fusing point of the polyethylene blend, screw speed is 80-150rpm.
7. expanded polyethylene composition according to claim 6, wherein, the extrusion temperature is
125-135℃。
8. a kind of polyethylene foam product, it is characterised in that the polyethylene foam product is by claim
Rotational moulding expanded polyethylene composition in 1-7 described in any one is prepared by rotational foaming, rolling
Modeling temperature is 200-240 DEG C, and the rotational moulding time is 20-26min.
9. polyethylene foam product according to claim 8, wherein, the polyethylene foam system
The compressive strength of product is more than 0.7MPa.
10. polyethylene foam product according to claim 8 or claim 9, wherein, the polyethylene is sent out
The Average Cell aperture of brewage is less than 750 μm, and abscess pore-size distribution is 100-120 μm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107103948A (en) * | 2017-05-10 | 2017-08-29 | 河北华通线缆集团股份有限公司 | A kind of marine streamer |
| CN108997645A (en) * | 2018-07-04 | 2018-12-14 | 湖北祥源新材科技股份有限公司 | The polyalkene foaming sheet material and its production technology of floor buffering |
| CN109734981A (en) * | 2018-11-30 | 2019-05-10 | 金旸（厦门）新材料科技有限公司 | A kind of rotational moulding crosslinked foaming polyethylene and preparation method thereof |
| US20220064419A1 (en) * | 2018-12-21 | 2022-03-03 | Borealis Ag | Improved foaming behaviour of polymer compositions using passive nucleation |
| CN115052734A (en) * | 2020-02-17 | 2022-09-13 | 诺瓦化学品(国际)股份有限公司 | Rotational moulding composition |
| US11746220B2 (en) | 2020-06-12 | 2023-09-05 | Braskem S.A. | High flow rotomolding compositions, processes thereof, and articles therefrom |
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| CN1688654A (en) * | 2002-10-01 | 2005-10-26 | 埃克森美孚化学专利公司 | Polyethylene compositions for rotational molding |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1688654A (en) * | 2002-10-01 | 2005-10-26 | 埃克森美孚化学专利公司 | Polyethylene compositions for rotational molding |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107103948A (en) * | 2017-05-10 | 2017-08-29 | 河北华通线缆集团股份有限公司 | A kind of marine streamer |
| CN108997645A (en) * | 2018-07-04 | 2018-12-14 | 湖北祥源新材科技股份有限公司 | The polyalkene foaming sheet material and its production technology of floor buffering |
| CN109734981A (en) * | 2018-11-30 | 2019-05-10 | 金旸（厦门）新材料科技有限公司 | A kind of rotational moulding crosslinked foaming polyethylene and preparation method thereof |
| US20220064419A1 (en) * | 2018-12-21 | 2022-03-03 | Borealis Ag | Improved foaming behaviour of polymer compositions using passive nucleation |
| CN115052734A (en) * | 2020-02-17 | 2022-09-13 | 诺瓦化学品(国际)股份有限公司 | Rotational moulding composition |
| US11746220B2 (en) | 2020-06-12 | 2023-09-05 | Braskem S.A. | High flow rotomolding compositions, processes thereof, and articles therefrom |
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