CN106554535B - 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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- CN106554535B CN106554535B CN201510639985.7A CN201510639985A CN106554535B CN 106554535 B CN106554535 B CN 106554535B CN 201510639985 A CN201510639985 A CN 201510639985A CN 106554535 B CN106554535 B CN 106554535B
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- 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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- 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
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- 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
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- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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- 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
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- 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
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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- 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
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- C08L2205/24—Crystallisation aids
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- 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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- 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)
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Abstract
The invention discloses a kind of rotational moulding expanded polyethylene composition and polyethylene foam products.The composition contains the nucleating agent of the polyethylene blend of 100 parts by weight, the foaming agent of 1-5 parts by weight, the antioxidant of 0.1-1 parts by weight, the lubricant of 0.1-1 parts by weight and 0.1-1 parts by weight；Wherein, the crystallization heat content of the polyethylene blend is 120J/g hereinafter, 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 total weight of the polyethylene blend, which contains the low density polyethylene (LDPE) B of the high density polyethylene (HDPE) A and 5-20 weight % of 80-95 weight %.Obtained polyethylene foam product can have better foam structure, higher intensity.
Description
Technical field
The present invention relates to a kind of rotational moulding expanded polyethylene compositions and a kind of polyethylene foam product.
Background technique
Rotational molding foaming product has the characteristics that light specific gravity, sound insulation, heat-insulated, market demand rapid development.But it makes
The rotational molding process of the standby foaming product is more special, belongs to no foam, it is desirable that Foamex has preferable mobility
And melt strength.But the higher resin of melt strength, processing fluidity can be poor, so selection Foamex and modification side
Method is most important for successful rotational molding foaming.The method for relatively mostly using crosslinking in the market thus, but be crosslinked
Journey is more difficult to control, is easier to occur being crosslinked too early, and the excessive expansion ratio that will cause of the degree of cross linking reduces.Therefore noncrosslinking foaming
Resin system has better processing performance.But noncrosslinking Foamex system is in carrying out foaming process, resin
Viscosity change will affect foaming formed foam, if such as viscosity rapidly decline, it will be difficult to maintain gas, foam is easy to brokenly
It splits or melts simultaneously.At present foaming product in the market, polyethylene material application is wider, therefore, it is good how to obtain foam structure
Noncrosslinking Foamex system, especially polyethylene system is the problem of highly research.
US2008/0128937A1 discloses a kind of foamable polyethylene composition, including (I) linear ethylene copolymer
Composition is the molecular weight distribution of 3-8, density 0.93-0.96g/cc and 1.5-3.0 with MI；(II) foaming agent and (III)
Foaming nucleation agent.Ethylene copolymer composition include at least one ethylene in butene-1, hexene -1 and octene-1 extremely
A kind of copolymer of few monomer.
JP2003-327757 improves melt strength by the way that crosslinking agent is added, but due to the addition of crosslinking agent, reacts more difficult control
System, shortens the control range of resin expanded process, and gel is unfavorable to the appearance of product.
US5366675A discloses a kind of method of molded foaming mesoporous product, including prepares foamable polyethylene
Based powders mixture comprising the ethylenic bond polymer with ester group of 0.5-7.5 parts by weight, MI polymerize higher than polyvinyl
Object；A effective amount of chemical foaming agent；With the nucleating agent of 0.01-2 parts by weight；And the mixture of powders is being foamed and melted
Under conditions of rotational molding form.The ethylenic bond polymer with ester group be ethyl vinyl ester copolymer, further for
Vinyl acetate ethylene (EVA).The method adds EVA, although improving the mobility of resin, the intensity of resin and resistance to
Warm nature is declined, and rotational molding overlong time or the excessively high meeting of temperature are so that abscess is obviously roughened.
Therefore, even aperture distribution, the foaming product that intensity is higher, easy to process are obtained in order to improve prior art, needed
Suitable polyethylene foam composition is provided, to obtain desired polyethylene foam product.
Summary of the invention
The purpose of the invention is to improve the compression of the abscess quality for the polyethylene foam product that rotational moulding obtains and abscess
Intensity provides a kind of rotational moulding expanded polyethylene composition and a kind of polyethylene foam product.
To achieve the goals above, the present invention provides a kind of rotational moulding expanded polyethylene composition, the composition contains
The polyethylene blend of 100 parts by weight, the foaming agent of 1-5 parts by weight, the antioxidant of 0.1-1 parts by weight, 0.1-1 parts by weight profit
The nucleating agent of lubrication prescription and 0.1-1 parts by weight；Wherein, the crystallization heat content of the polyethylene blend is 120J/g hereinafter, described poly-
The density of ethylene blends is 0.93-0.96g/cm3, the melt index of the polyethylene blend is 3-7g/10min；With institute
On the basis of the total weight for stating polyethylene blend, which contains high density polyethylene (HDPE) A and the 5-20 weight of 80-95 weight %
Measure the low density polyethylene (LDPE) B of %.
The present invention also provides a kind of polyethylene foam products, wherein the polyethylene foam product is provided by the present invention
Rotational moulding is prepared with expanded polyethylene composition by rotational foaming, and rotational moulding temperature is 200-240 DEG C, and the rotational moulding time is 20-
26min。
Rotational moulding expanded polyethylene composition provided by the invention, the materialization by controlling polyethylene blend therein refer to
Mark such as crystallizes heat content, density and melt index, can provide the polyethylene composition for being suitable for rotational foaming, further be made
Standby obtained polyethylene foam product can have better abscess quality, such as small and uniform foam structure, appearance in product
Face is smooth, the compressive strength of uniform wall thickness and higher abscess, is greater than 0.7MPa, and in addition processing performance is excellent and easy mold release.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
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
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The present invention provides a kind of rotational moulding expanded polyethylene composition, the composition contains the polyethylene of 100 parts by weight
Blend, the foaming agent of 1-5 parts by weight, the antioxidant of 0.1-1 parts by weight, the lubricant of 0.1-1 parts by weight and 0.1-1 parts by weight
Nucleating agent；Wherein, the crystallization heat content of the polyethylene blend is 120J/g hereinafter, 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 total of the polyethylene blend
On the basis of weight, which contains the low density polyethylene (LDPE) B of the high density polyethylene (HDPE) A and 5-20 weight % of 80-95 weight %.
In the present invention, inventor is the study found that control the polyethylene blend in rotational moulding expanded polyethylene composition
Crystallization heat content, the foaming product that foam structure is more preferable, compressive strength is high can be provided.It is preferred that the crystallization heat of polyethylene blend
Enthalpy is 100-120J/g.If crystallizing heat content is less than 100J/g, there are intensity low defects for foaming product；If it is big to crystallize heat content
In 120J/g, then that there are abscesses is larger, is unevenly distributed defect for foaming product.It is highly preferred that the crystallization heat content of polyethylene blend
For 108-115J/g, the polyethylene foam product of better quality can be obtained.Crystallizing heat content can be according to GB/T 19466.3-
2004 method measurement.
In the present invention, while controlling the crystallization heat content of polyethylene blend, the group of composition polyethylene and ethylene copolymers is selected
At as described above, control polyethylene blend density and melt index within the above range, the polyethylene foam product of preparation
It can provide while the surface of higher compressive strength and smooth even.
According to the present invention, the polyethylene blend can be the mixture of a variety of polyethylene, main to meet being total to for offer
Mixed object has the physical and chemical indexes of above-mentioned restriction.Under preferable case, the density of high density polyethylene (HDPE) A is 0.935-0.96g/
cm3, melt index 3-6g/10min.
In the case of, according to the invention it is preferred to, the density of low density polyethylene (LDPE) B is 0.92-0.93g/cm3, melt index is
2-20g/10min。
In the case of, according to the invention it is preferred to, the foaming agent is production of low-temperature foaming agent.
Preferably, the decomposition temperature of foaming agent is 160 DEG C -180 DEG C, gas forming amount 120-140ml/g.
It is highly preferred that the foaming agent is 4,4- oxobenzenesulfonyl hydrazide.
In the case of, according to the invention it is preferred to, the antioxidant is antioxidant 1010 and/or irgasfos 168.
In the present invention, the nucleating agent can be talcum powder, calcium carbonate.
In the present invention, the lubricant can be stearic acid, such as zinc stearate, calcium stearate.
In the case of, according to the invention it is preferred to, which can be by being squeezed on screw extruder
It is granulated preparation out, extrusion temperature is the screw speed 80-150rpm higher than 10 ± 4 DEG C of fusing point of the polyethylene blend.
In the case of, according to the invention it is preferred to, the extrusion temperature is 125-135 DEG C.
In the present invention, the method for preparing expanded polyethylene composition further include will squeeze out obtain it is granulated dry at 60 DEG C
Obtain pellet within dry 3 hours；Then after pellet being ground, the powder less than 35 mesh partial size is screened out, as preparing polyethylene
The raw material of foaming product.
The present invention also provides a kind of polyethylene foam products, wherein the polyethylene foam product is provided by the present invention
Rotational moulding is prepared with expanded polyethylene composition by rotational foaming, and rotational moulding temperature is 200-240 DEG C, and the rotational moulding time is 20-
26min。
In the case of, according to the invention it is preferred to, the compressive strength of the polyethylene foam product is 0.7MPa or more.It is preferred that pressing
Contracting intensity is 0.7-1MPa.
According to the present invention, the polyethylene foam product obtained has a better foam structure, under preferable case, the polyethylene
The Average Cell aperture of foaming product is 750 μm hereinafter, abscess pore-size distribution is 100-120 μm.Average Cell aperture and abscess
Pore-size distribution can be used for the foam structure that weight obtains product, can be by using optical microscopy (Shanghai Pu Dan optics instrument
Device company KTL-24B/C, amplification factor X70) observation product section and photograph (such as Fig. 1 and Fig. 2), measure photo on abscess
Aperture (diameter), then be calculated.Average Cell aperture refers to the aperture for counting multiple abscesses in above-mentioned photo, by formula d
=∑ nidi/∑ni(niFor the number in hole, diFor the diameter in hole) calculate the average diameter acquired.Average Cell aperture is in above-mentioned model
It encloses, the abscess quality that the product that rotational moulding obtains can have, the Average Cell aperture of the preferably described polyethylene foam product is
600-800μm.Abscess pore-size distribution can be the aperture according to the abscess counted in above-mentioned photo, by formula(diFor the diameter in hole, the number of N- abscess, d is Average Cell aperture) it is calculated, illustrate to count
Abscess aperture in extent of deviation relative to Average Cell aperture d；In above range, the product that rotational moulding obtains obtains uniform
Abscess.
The present invention will be described in detail by way of examples below.
In following embodiment, density polymer is measured and is determined according to the method B of ASTM D792-2013；
Crystallize heat content according to GB/T 19466.3-2004 method measure, by differential scanning calorimetry (DSC) program from
40 DEG C are warming up to 170 DEG C, then are cooled to 40 DEG C, and warming and cooling rate is 10 DEG C/min；
Melt index (MI) is measured and is determined under being 2.16Kg in 190 DEG C, load according to the method for ASTM D-1238；
According to the apparent density of the method measurement foamed plastics of GB/T 6343-2009, and it is calculate by the following formula foaming times
Rate: 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 carries out at 23 DEG C；
Used polyvinyl resin is as follows in embodiment and comparative example:
High density polyethylene -1: density 0.937g/cc, melt index (MI) 6g/10min；
High density polyethylene -2, density 0.963g/cc, melt index (MI) 8g/10min；
Low density polyethylene -1, density 0.926g/cc, melt index (MI) 20g/10min；
Low density polyethylene -2, density 0.926g/cc, melt index (MI) 2g/10min.
Other foaming agents, antioxidant, nucleating agent and lubricant are commercially available.
Embodiment 1
The present embodiment is for illustrating rotational moulding expanded polyethylene composition and polyethylene foam product provided by the invention.
(1) it mixes: being formed according to the material that table 1 is listed, density, crystallization heat content and the melting for measuring polyethylene blend refer to
Number, the results are shown in Table 2.Various materials are added in blender and are stirred to uniformly mixed；
(2) be granulated: add mixture into double screw extruder (Thermo Fisher company RheoDrive16 model) into
Row extruding pelletization, extrusion temperature, screw speed are as shown in table 1.Pellet is obtained within dry 3 hours at 60 DEG C by granulated, for rolling
Expanded polyethylene composition is used in modeling；
(3) it grinds and sieves: after pellet is ground, screening out the powder less than 35 mesh partial size, be used as rotational foaming
Raw material；
(4) rotational foaming: the rotational foaming raw material of 600g is added in mold, is carried out under the conditions of the rotational moulding being shown in Table 1
Rotational foaming, finally cooling, demoulding obtain rotation molding polyethylene foaming product.
The pressure density of obtained polyethylene foam product is measured, expansion ratio is calculated, article inner surface is observed, as a result sees
Table 2.
By the incision of obtained polyethylene foam product and with micro- sem observation abscess section and abscess quality, and takes a picture and to obtain figure
2 photo measures and calculates Average Cell aperture and abscess pore-size distribution, the results are shown in Table 2.
Foam aperture is smaller in Fig. 2, is evenly distributed, and illustrates that the product has good foam structure.
Embodiment 2-3
The present embodiment is for illustrating rotational moulding expanded polyethylene composition and polyethylene foam product provided by the invention.
According to the method for embodiment 1, measurement table 1 list material composition polyethylene blend density, crystallization heat content and
Melt index is shown in Table 2.
The material composition and condition listed according to table 1 obtain rotational moulding expanded polyethylene composition and polyethylene foam system
Product.
The pressure density of obtained polyethylene foam product is measured, expansion ratio is calculated, article inner surface is observed, as a result sees
Table 2.
By the incision of obtained polyethylene foam product and with micro- sem observation abscess section and abscess quality, measures and calculate
Average Cell aperture and abscess pore-size distribution, the results are shown in Table 2.
Comparative example 1
According to the method for embodiment 1, density, crystallization heat content and the melt index for the polyethylene that measurement table 1 is listed, are shown in Table 2.
The material composition and condition listed according to table 1 obtain expanded polyethylene composition and polyethylene foam product.
The pressure density of obtained polyethylene foam product is measured, expansion ratio is calculated, article inner surface is observed, as a result sees
Table 2.
Obtained polyethylene foam product is observed into abscess section and abscess quality according to the method for embodiment 1, Fig. 1 is to cut
Face photo measures and calculates Average Cell aperture and abscess pore-size distribution, the results are shown in Table 2.
Abscess is bigger than normal in Fig. 1, is unevenly distributed, and there is abscess coarsening phenomenon in upper surface, and the foam structure of the product is bad.
Comparative example 2-4
According to the method for embodiment 1, the polyethylene of table 1 or the density of polyethylene blend, crystallization heat content and melting are measured
Index is shown in Table 2.
The material composition and condition listed according to table 1 obtain expanded polyethylene composition and polyethylene foam product.
The pressure density of obtained polyethylene foam product is measured, expansion ratio is calculated, article inner surface is observed, as a result sees
Table 2.
Table 1
Table 2
It can be seen that polyethylene foamed combination provided by the invention by the result of embodiment and comparative example and table 1-2
Polyethylene blend in object, when crystallization heat content is controlled in the range of 100-120J/g, the foaming product of preparation be can have
More preferable foam structure, as abscess pore-size distribution embodies foam cell uniformity.Such as in comparative example 1-3, crystallization heat content is higher than 120J/
G, as a result the pore-size distribution numerical value of foaming product is big illustrates that abscess pore-size distribution is uneven.The melt index of polyethylene blend can be with
Guarantee mobility of the expanded polyethylene composition in processing, guarantees that foaming product surface is more flat and smooth.And it is suitably total
Mixed object density determines the strength of materials, such as comparative example 4, and blend material density is lower, the compressive strength of obtained foaming product
It is lower.
In embodiment 1-3, the foaming product of expanded polyethylene composition preparation provided by the invention, foam cell uniformity aperture
It is distributed between 100-120 μm, melt index large fluidity is good and compressive strength is greater than 0.7MPa and all has clear improvement.
Non-crosslinked expanded polyethylene composition provided by the invention can have higher compression intensity guaranteeing foaming product
Under the premise of, improve the uniformity of abscess, obtains the relatively narrow product of pore-size distribution, and improve product surface smoothness.
Claims (16)
1. a kind of rotational moulding expanded polyethylene composition, polyethylene blend of the composition by 100 parts by weight, 1-5 parts by weight
Production of low-temperature foaming agent, the antioxidant of 0.1-1 parts by weight, the lubricant of 0.1-1 parts by weight and 0.1-1 parts by weight nucleating agent group
At；It is characterized in that, the crystallization heat content of the polyethylene blend is 108-117J/g, 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 total of the polyethylene blend
On the basis of weight, which contains the low density polyethylene (LDPE) B of the high density polyethylene (HDPE) A and 5-20 weight % of 80-95 weight %；
Wherein, the foaming agent is 4,4- oxobenzenesulfonyl hydrazide.
2. expanded polyethylene composition according to claim 1, wherein the density of high density polyethylene (HDPE) A is 0.935-
0.96g/cm3, melt index 3-6g/10min.
3. expanded polyethylene composition according to claim 1, wherein the density of low density polyethylene (LDPE) B is 0.92-
0.93g/cm3, melt index 2-20g/10min.
4. expanded polyethylene composition according to claim 2, wherein the density of low density polyethylene (LDPE) B is 0.92-
0.93g/cm3, melt index 2-20g/10min.
5. expanded polyethylene composition according to claim 1 or 4, wherein the antioxidant be antioxidant 1010 and/or
Irgasfos 168.
6. expanded polyethylene composition according to claim 2, wherein the antioxidant is antioxidant 1010 and/or resists
Oxygen agent 168.
7. expanded polyethylene composition according to claim 3, wherein the antioxidant is antioxidant 1010 and/or resists
Oxygen agent 168.
8. according to claim 1,4, expanded polyethylene composition described in any one of 6-7, wherein the polyethylene foamed group
It is the fusing point 10 higher than the polyethylene blend that object, which is closed, by carrying out extruding pelletization preparation, extrusion temperature on screw extruder
± 4 DEG C, screw speed 80-150rpm.
9. expanded polyethylene composition according to claim 2, wherein the expanded polyethylene composition in screw rod by squeezing
Extruding pelletization preparation is carried out on machine out, extrusion temperature is higher than 10 ± 4 DEG C of fusing point of the polyethylene blend, and screw speed is
80-150rpm。
10. expanded polyethylene composition according to claim 3, wherein the expanded polyethylene composition passes through in screw rod
Extruding pelletization preparation is carried out on extruder, extrusion temperature is the screw speed higher than 10 ± 4 DEG C of fusing point of the polyethylene blend
For 80-150rpm.
11. expanded polyethylene composition according to claim 5, wherein the expanded polyethylene composition passes through in screw rod
Extruding pelletization preparation is carried out on extruder, extrusion temperature is the screw speed higher than 10 ± 4 DEG C of fusing point of the polyethylene blend
For 80-150rpm.
12. expanded polyethylene composition according to claim 8, wherein the extrusion temperature is 125-135 DEG C.
13. the expanded polyethylene composition according to any one of claim 9-12, wherein the extrusion temperature is
125-135℃。
14. a kind of polyethylene foam product, which is characterized in that the polyethylene foam product is by any one of claim 1-13
The rotational moulding is prepared with expanded polyethylene composition by rotational foaming, and rotational moulding temperature is 200-240 DEG C, the rotational moulding time
For 20-26min.
15. polyethylene foam product according to claim 14, wherein the compressive strength of the polyethylene foam product is
0.7MPa or more.
16. polyethylene foam product according to claim 14 or 15, wherein the average bubble of the polyethylene foam product
Hole aperture is 750 μm hereinafter, abscess pore-size distribution is 100-120 μm.
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| 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 |
| CN109734981B (en) * | 2018-11-30 | 2021-09-21 | 金旸（厦门）新材料科技有限公司 | Crosslinked foamed polyethylene for rotational molding and preparation method thereof |
| EP3670600A1 (en) * | 2018-12-21 | 2020-06-24 | 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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