CN109651680A - With the ultra-thin foamed material and preparation method thereof of excellent performance under high temperature - Google Patents
With the ultra-thin foamed material and preparation method thereof of excellent performance under high temperature Download PDFInfo
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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
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- C08J9/103—Azodicarbonamide
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- 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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- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
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- 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
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- 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
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Abstract
The invention discloses a kind of at high temperature with the ultra-thin foamed material and preparation method thereof of excellent performance, belong to polymer material manufacturing technology field, it includes 45~90 parts of polyvinyl resin with super-high molecular weight, 5~30 parts of ethylene copolymer, 10~30 modified fillers that the raw material of the foamed material is counted by ratio of weight and the number of copies.Present invention further teaches a kind of preparation methods of ultra-thin foamed material with excellent performance at high temperature.Foamed material abscess of the present invention is fine and close fine and smooth, in 70 DEG C of at a temperature of permanent compression set≤10% tested, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.Ultra-thin materials have no obvious deformation for alternating bending 10,000 times for 180 ° at normal temperature, adapt at high temperature as foam materials'use.
Description
Technical field
The invention belongs to polymer material manufacturing technology fields, and in particular to a kind of ultra-thin hair with excellent high performance
Foam material and preparation method thereof.
Background technique
Buffering foam is that have damping by what compound separated type material was prepared using foam material as substrate, and sound-absorbing is close
The material of envelope effect, is widely used in electric equipment products, component of machine, all kinds of small household appliances, and the insulation of Cellphone Accessories etc. is glued
Patch, sealing, anti-skidding and buffering are shockproof.
Compressibility and resilience are two fundamental characteristics for characterizing foam quality, the application range of high-compressibility foam compared with
Extensively, it can be filled into tiny gap, resilience is that can characterization foam keep original after repeatedly or for a long time compressing
Highly, if can also continue to provide damping, buffering and good stress overlapped characteristic.And under high temperature environment using
Padded coaming under foam, such as OLED screen, the high temperature retentivity of foam just seem more important.Traditional PE, PU and three
Poly cyanamid foam has good resiliency and sound absorption qualities, still, due to the limitation of material self character and processing technology,
It cannot obtain high foamability and the ultra-thin foamed material with excellent high performance.
Traditional PE material has very excellent comprehensive performance, but its heat distortion temperature is relatively low, limits it in height
The application of warm environment.In order to meet electronic product lightweight, the use demand of ultrathin and hot environment needs to develop one kind
High foamability, under the high temperature conditions with the ultra-thin foamed material of good retentivity.
Ultra-high molecular weight polyethylene refers to the polyethylene of 1,500,000 or more molecular weight, is a kind of high molecular polymerization of linear structure
Object belongs to thermoplastic engineering plastic.Ultra-high molecular weight polyethylene has the performance of excellent machinery, physics, chemistry etc., quilt
It is widely used in machinery, chemical industry, transport field.Although ultra-high molecular weight polyethylene has very excellent characteristic, its
Heat distortion temperature is relatively low, and which has limited its applications in higher temperature environment.
If can be improved the heat distortion temperature of superhigh molecular weight polyethylene material, this material just adapts to high temperature
Use under environment, the material very outstanding as a kind of comprehensive performance greatly extend its application neck to replace other materials
Domain more fully plays its advantage.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the purpose of the present invention is to provide one kind to have excellent high
Ultra-thin foamed material of performance and preparation method thereof solves ultra-thin foamed material and exists by the comprehensive design of ingredient and technique
The poor problem of retentivity under high temperature, with a thickness of 0.1~0.2mm, the average tensile strength of 70 DEG C of tests is the foam of preparation
1.5Mpa, compression set≤10%, the alternating bending 10,000 times of 180 ° of foam have no obvious deformation.
To achieve the above object, according to one aspect of the present invention, it provides a kind of with the ultra-thin of excellent high performance
Foamed material, the raw material of the foamed material and each raw material include: according to parts by weight
45~90 parts of polyvinyl resin with super-high molecular weight,
5~30 parts of ethylene copolymer,
10~30 modified fillers,
2~20 parts of modified foaming agent,
0.5~3 part of processing aid,
Wherein, the modified foaming agent is made of foaming agent and catalyst, catalyst accounting modified foaming agent total weight
0.5~15%,
The ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength is not less than 1.5Mpa, compression set≤10%, 180 ° of 70 DEG C of tests
Alternating bending 10,000 times without deformation.
Further, the raw material of the foamed material and each raw material include: according to parts by weight
50~75 parts of polyvinyl resin with super-high molecular weight
10~15 parts of ethylene copolymer
10~15 modified fillers
4~8 parts of modified foaming agent
0.5~3 part of processing aid
Wherein, the modified foaming agent is made of foaming agent and catalyst, and the 1 of catalyst accounting modified foaming agent total weight
~2%.
Further, the tensile strength of the ethylene copolymer be 10~40MPa, elongation at break be 1000~
2000%, melt index is 0.5~4g/10min.
Further, the ethylene copolymer be ethylene-vinyl acetate copolymer, ethylene octene copolymer, silicon rubber and
Any one or more in ethylene-propylene diene copolymer,
The modified filler is any one or more of kaolin, calcium carbonate, titanium dioxide-.
Further, the foamed material is that 3~50, shore hardness C is less than with a thickness of 0.1~0.3mm, expansion ratio
27.Measuring instrument corresponding to shore hardness is Shore durometer, is broadly divided into three classes: A type, c-type and D type.Wherein c-type is suitable for
Contain poromerics made of foaming agent in rubber and plastic, plastics.
Further, the foamed material is with following performance: stress≤0.05MPa under 25% compressive deformation, and 50%
Stress≤0.20MPa under compressive deformation, stress≤0.50MPa under 75% compressive deformation,
Foamed material maximum compression ratio >=0.70, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.
Further, the foamed material has hole-closing structure.
The second aspect according to the invention also provides a kind of ultra-thin hair prepared as described above with excellent high performance
The preparation method of foam material comprising following steps:
(1) by polyvinyl resin with super-high molecular weight, ethylene copolymer, modified filler, modified foaming agent, processing aid is together
It is kneaded mixing, and carries out granulation processing at a set temperature；
(2) the master batch extrusion molding for being made step (1), and at the uniform velocity it is extruded into sheet material；
(3) sheet material of extrusion molding is placed under irradiation bomb and carries out cross-linking radiation, the irradiation bomb includes high energy electron
Accelerator, ultraviolet light, irradiation dose 20-50Mrad；
(4) sheet material after crosslinking is placed in foaming furnace, is foamed at 220-280 DEG C of temperature, obtain thickness model
The semi-finished product being trapped among within the scope of 0.3-0.6mm；
(5) above-mentioned semi-finished product are stretched by hot compression stretching device, obtains thickness range in 0.1-0.3mm range
Interior superthin section.
Further, in step (3), electron irradiation crosslinking electron energy be 0.5~3.0MeV, irradiation dose be 30~
50 Megarads, the foaming body substrate sheet number of plies for carrying out electron irradiation crosslinking is 4~8 layers, and surface sweeping width is 800~1000mm.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have the technical effect that
The design of ingredient and technique is more ingenious and unique in the present invention, and it is poly- for super high molecular weight to account for more major ingredient
Vinyl, but final foamed material abscess is fine and close fine and smooth, has the advantages that flexibility and resilience performance are high, in hot conditions
There is down excellent property retention power, foam unit thickness is enable to play better buffer function.
Detailed description of the invention
Fig. 1 is the flow diagram that ultra-thin materials method is prepared in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention provides under a kind of high temperature with the ultra-thin foamed material of excellent performance, the raw material of the foamed material with
And each raw material count by ratio of weight and the number of copies include: 45-90 parts of polyvinyl resin with super-high molecular weight, 5-30 parts of ethylene copolymer,
10-30 modified filler.It should be noted that the raw material of foamed material count by ratio of weight and the number of copies further include 2-20 parts of foaming agents and plus
Work auxiliary agent.Wherein processing aid includes 0.1-2 parts of lubricants, 0.1-2 parts of antioxidant, 0.5-2 portions of nucleating agents, lubricant, antioxygen
Agent and nucleating agent are processing aid, but processing aid comes to 0.5~3 part.
Wherein, with 45-90 parts of polyvinyl resin with super-high molecular weight, for adjusting hair on the basis of 5-30 parts of ethylene copolymer
The mechanical performance of foam material, 10-30 parts of modified fillers are used to adjust the high-temperature behavior of material, and 2-20 parts of foaming agents are for adjusting hair
The expansion ratio of foam material, 0.1-2 parts of lubricant are used to adjust the processing performance of foamed material, and 0.1-2 parts of antioxidant is used
In the ageing properties and electron irradiation dosage of control foamed material, 0.5-3 parts of nucleating agent is for controlling foamed material abscess
Uniformity and pore size.
For polyvinyl resin with super-high molecular weight as major ingredient, last ultra-thin foamed material abscess obtained is fine and close fine and smooth, has
Excellent high-temperature behavior.Ethylene copolymer tensile strength is 10~40MPa, elongation at break is 1000~2000%.Above-mentioned ginseng
Several ultra-high molecular weight polyethylene melt strengths is high, and the degree of entanglement of molecule in the molten state is high, and it is strong that abscess hole wall can be improved
Degree prevents abscess in foaming process from merging, and then improves the compactness of abscess, meanwhile, the ethylene copolymer of above-mentioned parameter also has
There is outstanding processing performance.
In one embodiment of the invention, the ethylene copolymer be ethylene-vinyl acetate copolymer, POE, EPDM,
Any one or more in silicon rubber.The modified filler be kaolin, calcium carbonate, in titanium dioxide any one or it is more
Kind.
Wherein, the flexibility of POE (ethylene octene copolymer) molecule segment is fine, and POE is as a kind of elastomer, can be with
The resilience of enhanced foaming material；Ethylene-vinyl acetate copolymer (EVA) can effectively prevent the precipitation of powder, while ethylene-
The pliability of foamed material can be enhanced as a kind of elastomer resin in acetate ethylene copolymer；EPDM (ethylene propylene diene rubber)
Itself can be oil-filled, can reduce material viscosity, easy to process, while oil has a small amount of precipitation, can prevent to a certain extent
Foamed material bonding die, and EPDM material has elasticity well, the resilience of foamed material can be enhanced, moreover it is possible to play anti-skidding
Effect；Silicon rubber strand has a variety of functional groups, and foamed material heat resistance obtained is more preferable after cross-linking radiation, more resistant to
Abrasion, and bonding die can be prevented to a certain extent.
Wherein, the foamed material is 3~50, hardness C less than 27 with a thickness of 0.1~0.3mm, expansion ratio.The hair
Stress≤0.05MPa under 25% compressive deformation of foam material, stress≤0.20MPa under 50% compressive deformation, 75% compression become
Stress≤0.50MPa under shape.The compression set of foamed material maximum compression ratio >=0.70,70 DEG C test≤
10%, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.The foamed material has hole-closing structure.
Specifically, foaming agent is azodicarbonamide, azodiformate, 1,3- benzene disulfohydrazide, unifor
One of or it is a variety of, catalyst is zinc oxide, for adjusting abscess, the antioxidant be antioxidant 1010, antioxidant 1098,
One of antioxidant 626 is a variety of, and the lubricant is one of calcium stearate and zinc stearate or a variety of, the nucleation
Agent is one of calcium carbonate, silica, sodium citrate or a variety of.
The present invention provides it is a kind of prepare as described above with excellent high performance ultra-thin foamed material preparation method,
It is characterized in that, itself the following steps are included:
(1) by polyvinyl resin with super-high molecular weight, ethylene copolymer, modified filler, modified foaming agent, processing aid is together
It is kneaded mixing, and carries out granulation processing at a set temperature；
(2) the master batch extrusion molding for being made step (1), and at the uniform velocity it is extruded into sheet material；
(3) sheet material of extrusion molding is placed under irradiation bomb and carries out cross-linking radiation, the irradiation bomb includes high energy electron
Accelerator, ultraviolet light, irradiation dose 20-50Mrad；
(4) sheet material after crosslinking is placed in foaming furnace, is foamed at 220-280 DEG C of temperature, obtain thickness model
The semi-finished product being trapped among within the scope of 0.3-0.6mm；
(5) above-mentioned semi-finished product are stretched by hot compression stretching device, obtains thickness range in 0.1-0.3mm range
Interior superthin section.
In Practical Project practice, it is specific the preparation method is as follows:
(1) following weight fraction ratio: 45-90 parts of polyvinyl resin with super-high molecular weight, 5-30 parts of ethylene copolymers, 10- is pressed
30 modified fillers, 2-20 part foaming agent, 0.1-3 parts of lubricants, 0.1-3 parts of antioxidant, 0.5-3 portions of nucleating agents, weigh foaming material
The raw material of material.
(2) by polyvinyl resin with super-high molecular weight, modified filler, ethylene copolymer, modified foaming agent, processing aid is together
It is kneaded mixing, and carries out granulation processing at a certain temperature.In step (2), by basic master batch and foaming agent, lubricant, antioxygen
Agent, nucleating agent are mediated, can make foaming agent, lubricant, antioxidant, nucleating agent in basic master batch dispersedly more evenly,
Compatibility can be more preferable.
(3) the master batch extrusion molding for being made step (2), and at the uniform velocity it is extruded into sheet material.
(4) sheet material of extrusion molding is placed under irradiation bomb and carries out cross-linking radiation, the irradiation bomb includes high energy electron
Accelerator, ultraviolet light, irradiation dose 20-50Mrad.In the step, electron irradiation crosslinking electron energy be 0.5~
3.0MeV, irradiation dose are 30~50 Megarads, and the foaming body substrate sheet number of plies for carrying out electron irradiation crosslinking is 4~8 layers, are swept
Face width is 800~1000mm.
(5) sheet material after crosslinking is placed in foaming furnace, foaming is carried out at 220-280 DEG C of temperature can obtain thickness model
The semi-finished product being trapped among within the scope of 0.3-0.6mm.
(6) above-mentioned semi-finished product be can be obtained into thickness range within the scope of 0.1-0.3mm by hot compression stretching device
Superthin section.
Illustrate preparation method of the present invention in further detail below with reference to more specific embodiment.
Embodiment 1
The present embodiment prepares a kind of ultra-thin foamed material with excellent high performance, and the raw material of the foamed material is by weight
Amount portion rate meter includes 45 parts of polyvinyl resin with super-high molecular weight, 5 parts of ethylene copolymers, 10 parts of modified fillers, 2 parts of foaming
Agent, 0.1 part of lubricant, 0.1 part of antioxidant, 0.5 portion of nucleating agent.Wherein, the tensile strength of ethylene copolymer is 40MPa, is broken
Elongation is 2000%, melt index 3g/10min.
A kind of preparation method of the ultra-thin foamed material with excellent high performance, comprising the following steps:
(1) following weight fraction ratio: 45 parts of polyvinyl resin with super-high molecular weight, 5 parts of ethylene copolymers, 10 parts of modifications is pressed
Filler, 2 parts of foaming agents, 0.1 part of lubricant, 0.1 part of antioxidant, 0.5 portion of nucleating agent, weigh the raw material of foamed material；
(2) by step (1) polyvinyl resin with super-high molecular weight in weighed raw material, ethylene copolymer at normal temperature
It mediates 2~20 minutes, extruder granulation is then drained into, to obtain basic master batch；
(3) the basic master batch obtained in step (2) is mediated at normal temperature with foaming agent, lubricant, antioxidant, nucleating agent
2~20 minutes, extruder granulation is then drained into, to obtain foaming master batch；
(4) foaming master batch obtained in step (3) is squeezed out using extruder in flakes, to obtain foaming body substrate；
(5) the foaming body substrate obtained in step (4) is subjected to electron irradiation crosslinking, to obtain foaming body master slice；The step
In rapid, the electron energy of electron irradiation crosslinking is 3.0MeV, and irradiation dose is 30 Megarads, carries out the foaming of electron irradiation crosslinking
The body substrate sheet number of plies is 5 layers, and surface sweeping width is 900mm.
(6) the foaming body master slice free style obtained in step (5) is foamed, foaming is carried out at 260 DEG C of temperature to be obtained
Semi-finished product of the thickness range within the scope of 0.3mm.
(7) above-mentioned semi-finished product be can be obtained into the superthin section of thickness 0.1mm by hot compression stretching device.
In the present embodiment, the ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength 1.5Mpa, the compression set 10% of 70 DEG C of tests, 180 ° of alternating bendings
10000 times without deformation, the foamed material is with a thickness of 0.1mm, expansion ratio 4, shore hardness C26.Under 25% compressive deformation
0.05MPa is answered, the stress 0.18MPa under 50% compressive deformation, the stress 0.5MPa under 75% compressive deformation, the foamed material
Maximum compression ratio 0.71, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.Foamed material has hole-closing structure.
Embodiment 2
The present embodiment prepares a kind of ultra-thin foamed material with excellent high performance, and the raw material of the foamed material is by weight
Amount portion rate meter includes 90 parts of polyvinyl resin with super-high molecular weight, 30 parts of ethylene copolymers, 30 parts of modified fillers, 20 parts of foaming
Agent, 0.5 part of lubricant, 0.5 part of antioxidant, 2 portions of nucleating agents.Wherein, the tensile strength of ethylene copolymer is 10MPa, fracture is stretched
Long rate is 1000%, melt index 0.5g/10min.
A kind of preparation method of the ultra-thin foamed material with excellent high performance, comprising the following steps:
(1) by following weight fraction ratio: 90 parts of polyvinyl resin with super-high molecular weight, 30 parts of ethylene copolymers, 30 parts change
Property filler, 20 parts of foaming agents, 0.5 part of lubricant, 0.5 part of antioxidant, 2 portions of nucleating agents, weigh the raw material of foamed material；
(2) by step (1) polyvinyl resin with super-high molecular weight in weighed raw material, ethylene copolymer at normal temperature
It mediates 2~20 minutes, extruder granulation is then drained into, to obtain basic master batch；
(3) the basic master batch obtained in step (2) is mediated at normal temperature with foaming agent, lubricant, antioxidant, nucleating agent
2~20 minutes, extruder granulation is then drained into, to obtain foaming master batch；
(4) foaming master batch obtained in step (3) is squeezed out using extruder in flakes, to obtain foaming body substrate；
(5) the foaming body substrate obtained in step (4) is subjected to electron irradiation crosslinking, to obtain foaming body master slice；The step
In rapid, the electron energy of electron irradiation crosslinking is 0.5MeV, and irradiation dose is 50 Megarads, carries out the foaming of electron irradiation crosslinking
The body substrate sheet number of plies is 4 layers, and surface sweeping width is 800mm.
(6) the foaming body master slice free style obtained in step (5) is foamed, foaming is carried out at 280 DEG C of temperature to be obtained
Semi-finished product of the thickness range within the scope of 0.6mm.
(7) above-mentioned semi-finished product be can be obtained into the superthin section of thickness 0.3mm by hot compression stretching device.
In the present embodiment, the ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength 1.9Mpa, the compression set 7% of 70 DEG C of tests, 180 ° of alternating bendings 1
Wan Ciwu deformation, the foamed material is with a thickness of 0.3mm, and expansion ratio 50, shore hardness C is less than 22.25% compressive deformation
Under stress 0.05MPa, the stress 0.20MPa under 50% compressive deformation, the stress 0.48MPa under 75% compressive deformation is described
Foamed material maximum compression ratio 0.80, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.Foamed material has hole-closing structure.
Embodiment 3
The present embodiment prepares a kind of ultra-thin foamed material with excellent high performance, and the raw material of the foamed material is by weight
Amount portion rate meter includes 50 parts of polyvinyl resin with super-high molecular weight, 10 parts of ethylene copolymers, 10 parts of modified fillers, 4 parts of foaming
Agent, 0.2 part of lubricant, 0.1 part of antioxidant, 0.2 portion of nucleating agent.Wherein, the tensile strength of ethylene copolymer is 30MPa, is broken
Elongation is 1500%, melt index 4g/10min.
A kind of preparation method of the ultra-thin foamed material with excellent high performance, comprising the following steps:
(1) by following weight fraction ratio: 50 parts of polyvinyl resin with super-high molecular weight, 10 parts of ethylene copolymers, 10 parts change
Property filler, 4 parts of foaming agents, 0.2 part of lubricant, 0.1 part of antioxidant, 0.2 portion of nucleating agent, weigh the raw material of foamed material；
(2) by step (1) polyvinyl resin with super-high molecular weight in weighed raw material, ethylene copolymer at normal temperature
It mediates 2~20 minutes, extruder granulation is then drained into, to obtain basic master batch；
(3) the basic master batch obtained in step (2) is mediated at normal temperature with foaming agent, lubricant, antioxidant, nucleating agent
2~20 minutes, extruder granulation is then drained into, to obtain foaming master batch；
(4) foaming master batch obtained in step (3) is squeezed out using extruder in flakes, to obtain foaming body substrate；
(5) the foaming body substrate obtained in step (4) is subjected to electron irradiation crosslinking, to obtain foaming body master slice；The step
In rapid, the electron energy of electron irradiation crosslinking is 2MeV, and irradiation dose is 40 Megarads, carries out the foaming body of electron irradiation crosslinking
The substrate sheet number of plies is 8 layers, and surface sweeping width is 1000mm.
(6) the foaming body master slice free style obtained in step (5) is foamed, foaming is carried out at 220 DEG C of temperature to be obtained
Semi-finished product of the thickness range within the scope of 0.4mm.
(7) above-mentioned semi-finished product be can be obtained into the superthin section of thickness 0.2mm by hot compression stretching device.
In the present embodiment, the ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength 1.8Mpa, the compression set 8% of 70 DEG C of tests, 180 ° of alternating bendings 1
Wan Ciwu deformation, the foamed material is with a thickness of 0.2mm, expansion ratio 25, shore hardness C25.Under 25% compressive deformation
Stress 0.04MPa, the stress 0.15MPa under 50% compressive deformation, the stress 0.46MPa under 75% compressive deformation, the foaming
Material maximum compression ratio 0.75, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.Foamed material has hole-closing structure.
Embodiment 4
The present embodiment prepares a kind of ultra-thin foamed material with excellent high performance, and the raw material of the foamed material is by weight
Amount portion rate meter includes 75 parts of polyvinyl resin with super-high molecular weight, 15 parts of ethylene copolymers, 15 parts of modified fillers, 8 parts of foaming
Agent, 1 part of lubricant, 1 part of antioxidant, 1 portion of nucleating agent.Wherein, the tensile strength of ethylene copolymer is 35MPa, elongation at break
For 1800%, melt index 2g/10min.
A kind of preparation method of the ultra-thin foamed material with excellent high performance, comprising the following steps:
(1) by following weight fraction ratio: 75 parts of polyvinyl resin with super-high molecular weight, 15 parts of ethylene copolymers, 15 parts change
Property filler, 8 parts of foaming agents, 1 part of lubricant, 1 part of antioxidant, 1 portion of nucleating agent, weigh the raw material of foamed material；
(2) by step (1) polyvinyl resin with super-high molecular weight in weighed raw material, ethylene copolymer at normal temperature
It mediates 2~20 minutes, extruder granulation is then drained into, to obtain basic master batch；
(3) the basic master batch obtained in step (2) is mediated at normal temperature with foaming agent, lubricant, antioxidant, nucleating agent
2~20 minutes, extruder granulation is then drained into, to obtain foaming master batch；
(4) foaming master batch obtained in step (3) is squeezed out using extruder in flakes, to obtain foaming body substrate；
(5) the foaming body substrate obtained in step (4) is subjected to electron irradiation crosslinking, to obtain foaming body master slice；The step
In rapid, the electron energy of electron irradiation crosslinking is 1MeV, and irradiation dose is 45 Megarads, carries out the foaming body of electron irradiation crosslinking
The substrate sheet number of plies is 7 layers, and surface sweeping width is 1000mm.
(6) the foaming body master slice free style obtained in step (5) is foamed, foaming is carried out at 250 DEG C of temperature to be obtained
Semi-finished product of the thickness range within the scope of 0.4mm.
(7) by above-mentioned semi-finished product by hot compression stretching device, it can be obtained the superthin section that thickness range is 0.2mm.
In the present embodiment, the ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength 2.2Mpa, the compression set 6% of 70 DEG C of tests, 180 ° of alternating bendings 1
Wan Ciwu deformation, the foamed material is with a thickness of 0.2mm, expansion ratio 25, shore hardness C22.Under 25% compressive deformation
Stress 0.03MPa, the stress 0.15MPa under 50% compressive deformation, the stress 0.40MPa under 75% compressive deformation, the foaming
Material maximum compression ratio 0.85, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.Foamed material has hole-closing structure.
Comparative example 1:
Raw material and preparation method and embodiment 4 are consistent, and distinctive points are 75 parts in embodiment 4 of ultra-high molecular weight polyethylene
Resin changes 75 parts of low density polyethylene (LDPE)s into.
In comparative example 1, the ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength 1.3Mpa, the compression set 15% of 70 DEG C of tests, 180 ° of alternating bendings
It has deformed for 10000 times, the foamed material is with a thickness of 0.2mm, expansion ratio 3, shore hardness C35.Under 25% compressive deformation
Stress 0.09MPa, the stress 0.30MPa under 50% compressive deformation, the stress 0.70MPa under 75% compressive deformation, the foaming
Material maximum compression ratio 0.50, longitudinal contraction 2%, cross-direction shrinkage 1%.Foamed material has hole-closing structure.
In the present invention, polyvinyl resin with super-high molecular weight refers to the polyethylene of 1,000,000 or more molecular weight.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. under a kind of high temperature with excellent performance ultra-thin foamed material, which is characterized in that the raw material of the foamed material and
Each raw material includes: according to parts by weight
45~90 parts of polyvinyl resin with super-high molecular weight,
5~30 parts of ethylene copolymer,
10~30 modified fillers,
2~20 parts of modified foaming agent,
0.5~3 part of processing aid,
Wherein, the modified foaming agent is made of foaming agent and catalyst, catalyst accounting modified foaming agent total weight 0.5~
15%,
The ultra-thin foamed material has following performance:
When 70 DEG C of tests, average tensile strength is not less than 1.5Mpa, and compression set≤10%, 180 ° of 70 DEG C of tests is repeatedly
Bent ten thousand times are without deformation.
2. with the ultra-thin foamed material of excellent performance under high temperature as described in claim 1, which is characterized in that the foaming material
The raw material of material and each raw material include: according to parts by weight
50~75 parts of polyvinyl resin with super-high molecular weight
10~15 parts of ethylene copolymer
10~15 modified fillers
4~8 parts of modified foaming agent
0.5~3 part of processing aid
Wherein, the modified foaming agent is made of foaming agent and catalyst, catalyst accounting modified foaming agent total weight 1~
2%.
3. with the ultra-thin foamed material of excellent performance under high temperature as claimed in claim 2, which is characterized in that the ethylene is total
The tensile strength of polymers is 10~40MPa, elongation at break is 1000~2000%, melt index is 0.5~4g/10min.
4. with the ultra-thin foamed material of excellent performance under high temperature as claimed in claim 3, which is characterized in that the ethylene is total
Polymers be ethylene-vinyl acetate copolymer, ethylene octene copolymer, silicon rubber and ethylene-propylene diene copolymer in any one or it is more
Kind,
The modified filler is any one or more of kaolin, calcium carbonate and titanium dioxide.
5. with the ultra-thin foamed material of excellent performance under high temperature as claimed in claim 4, which is characterized in that the foaming material
Material is 3~50, shore hardness C less than 27 with a thickness of 0.1~0.3mm, expansion ratio.
6. with the ultra-thin foamed material of excellent performance under high temperature as claimed in claim 5, which is characterized in that the foaming material
Material has following performance: stress≤0.05MPa under 25% compressive deformation, stress≤0.20MPa under 50% compressive deformation,
Stress≤0.50MPa under 75% compressive deformation,
Foamed material maximum compression ratio >=0.70, longitudinal contraction≤1%, cross-direction shrinkage≤0.5%.
7. with the ultra-thin foamed material of excellent performance under high temperature as claimed in claim 6, which is characterized in that the foaming material
Material has hole-closing structure.
8. a kind of preparation method for preparing the ultra-thin foamed material as described in one of claim 1-7 with excellent high performance,
It is characterized in that, itself the following steps are included:
(1) by polyvinyl resin with super-high molecular weight, ethylene copolymer, modified filler, modified foaming agent, processing aid is kneaded together
Mixing, and granulation processing is carried out at a set temperature；
(2) the master batch extrusion molding for being made step (1), and at the uniform velocity it is extruded into sheet material；
(3) sheet material of extrusion molding is placed under irradiation bomb and carries out cross-linking radiation, the irradiation bomb includes that high energy electron accelerates
Device, ultraviolet light, irradiation dose 20-50Mrad；
(4) sheet material after crosslinking is placed in foaming furnace, is foamed at 220-280 DEG C of temperature, obtained thickness range and exist
Semi-finished product within the scope of 0.3-0.6mm；
(5) above-mentioned semi-finished product are stretched by hot compression stretching device, obtains thickness range within the scope of 0.1-0.3mm
Superthin section.
9. method according to claim 8, which is characterized in that in step (3), the electron energy of electron irradiation crosslinking is 0.5
~3.0MeV, irradiation dose are 30~50 Megarads, and the foaming body substrate sheet number of plies for carrying out electron irradiation crosslinking is 4~8 layers,
Surface sweeping width is 800~1000mm.
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